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cpython/Lib/test/test_grammar.py
Serhiy Storchaka 73a7e9b10b bpo-10544: Deprecate "yield" in comprehensions and generator expressions. (GH-4579) 
The current behaviour of yield expressions inside comprehensions  and
generator expressions is essentially an accident of implementation - it
arises implicitly from the way the compiler handles yield expressions inside
nested functions and generators.

Since the current behaviour wasn't deliberately designed, and is inherently
confusing, we're deprecating it, with no current plans to reintroduce it.
Instead, our advice will be to use a named nested generator definition
for cases where this behaviour is desired.
2017-12-01 14:54:17 +10:00

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# Python test set -- part 1, grammar.
# This just tests whether the parser accepts them all.
from test.support import check_syntax_error
import inspect
import unittest
import sys
# testing import *
from sys import *
# different import patterns to check that __annotations__ does not interfere
# with import machinery
import test.ann_module as ann_module
import typing
from collections import ChainMap
from test import ann_module2
import test
# These are shared with test_tokenize and other test modules.
#
# Note: since several test cases filter out floats by looking for "e" and ".",
# don't add hexadecimal literals that contain "e" or "E".
VALID_UNDERSCORE_LITERALS = [
'0_0_0',
'4_2',
'1_0000_0000',
'0b1001_0100',
'0xffff_ffff',
'0o5_7_7',
'1_00_00.5',
'1_00_00.5e5',
'1_00_00e5_1',
'1e1_0',
'.1_4',
'.1_4e1',
'0b_0',
'0x_f',
'0o_5',
'1_00_00j',
'1_00_00.5j',
'1_00_00e5_1j',
'.1_4j',
'(1_2.5+3_3j)',
'(.5_6j)',
]
INVALID_UNDERSCORE_LITERALS = [
# Trailing underscores:
'0_',
'42_',
'1.4j_',
'0x_',
'0b1_',
'0xf_',
'0o5_',
'0 if 1_Else 1',
# Underscores in the base selector:
'0_b0',
'0_xf',
'0_o5',
# Old-style octal, still disallowed:
'0_7',
'09_99',
# Multiple consecutive underscores:
'4_______2',
'0.1__4',
'0.1__4j',
'0b1001__0100',
'0xffff__ffff',
'0x___',
'0o5__77',
'1e1__0',
'1e1__0j',
# Underscore right before a dot:
'1_.4',
'1_.4j',
# Underscore right after a dot:
'1._4',
'1._4j',
'._5',
'._5j',
# Underscore right after a sign:
'1.0e+_1',
'1.0e+_1j',
# Underscore right before j:
'1.4_j',
'1.4e5_j',
# Underscore right before e:
'1_e1',
'1.4_e1',
'1.4_e1j',
# Underscore right after e:
'1e_1',
'1.4e_1',
'1.4e_1j',
# Complex cases with parens:
'(1+1.5_j_)',
'(1+1.5_j)',
]
class TokenTests(unittest.TestCase):
def test_backslash(self):
# Backslash means line continuation:
x = 1 \
+ 1
self.assertEqual(x, 2, 'backslash for line continuation')
# Backslash does not means continuation in comments :\
x = 0
self.assertEqual(x, 0, 'backslash ending comment')
def test_plain_integers(self):
self.assertEqual(type(000), type(0))
self.assertEqual(0xff, 255)
self.assertEqual(0o377, 255)
self.assertEqual(2147483647, 0o17777777777)
self.assertEqual(0b1001, 9)
# "0x" is not a valid literal
self.assertRaises(SyntaxError, eval, "0x")
from sys import maxsize
if maxsize == 2147483647:
self.assertEqual(-2147483647-1, -0o20000000000)
# XXX -2147483648
self.assertTrue(0o37777777777 > 0)
self.assertTrue(0xffffffff > 0)
self.assertTrue(0b1111111111111111111111111111111 > 0)
for s in ('2147483648', '0o40000000000', '0x100000000',
'0b10000000000000000000000000000000'):
try:
x = eval(s)
except OverflowError:
self.fail("OverflowError on huge integer literal %r" % s)
elif maxsize == 9223372036854775807:
self.assertEqual(-9223372036854775807-1, -0o1000000000000000000000)
self.assertTrue(0o1777777777777777777777 > 0)
self.assertTrue(0xffffffffffffffff > 0)
self.assertTrue(0b11111111111111111111111111111111111111111111111111111111111111 > 0)
for s in '9223372036854775808', '0o2000000000000000000000', \
'0x10000000000000000', \
'0b100000000000000000000000000000000000000000000000000000000000000':
try:
x = eval(s)
except OverflowError:
self.fail("OverflowError on huge integer literal %r" % s)
else:
self.fail('Weird maxsize value %r' % maxsize)
def test_long_integers(self):
x = 0
x = 0xffffffffffffffff
x = 0Xffffffffffffffff
x = 0o77777777777777777
x = 0O77777777777777777
x = 123456789012345678901234567890
x = 0b100000000000000000000000000000000000000000000000000000000000000000000
x = 0B111111111111111111111111111111111111111111111111111111111111111111111
def test_floats(self):
x = 3.14
x = 314.
x = 0.314
# XXX x = 000.314
x = .314
x = 3e14
x = 3E14
x = 3e-14
x = 3e+14
x = 3.e14
x = .3e14
x = 3.1e4
def test_float_exponent_tokenization(self):
# See issue 21642.
self.assertEqual(1 if 1else 0, 1)
self.assertEqual(1 if 0else 0, 0)
self.assertRaises(SyntaxError, eval, "0 if 1Else 0")
def test_underscore_literals(self):
for lit in VALID_UNDERSCORE_LITERALS:
self.assertEqual(eval(lit), eval(lit.replace('_', '')))
for lit in INVALID_UNDERSCORE_LITERALS:
self.assertRaises(SyntaxError, eval, lit)
# Sanity check: no literal begins with an underscore
self.assertRaises(NameError, eval, "_0")
def test_string_literals(self):
x = ''; y = ""; self.assertTrue(len(x) == 0 and x == y)
x = '\''; y = "'"; self.assertTrue(len(x) == 1 and x == y and ord(x) == 39)
x = '"'; y = "\""; self.assertTrue(len(x) == 1 and x == y and ord(x) == 34)
x = "doesn't \"shrink\" does it"
y = 'doesn\'t "shrink" does it'
self.assertTrue(len(x) == 24 and x == y)
x = "does \"shrink\" doesn't it"
y = 'does "shrink" doesn\'t it'
self.assertTrue(len(x) == 24 and x == y)
x = """
The "quick"
brown fox
jumps over
the 'lazy' dog.
"""
y = '\nThe "quick"\nbrown fox\njumps over\nthe \'lazy\' dog.\n'
self.assertEqual(x, y)
y = '''
The "quick"
brown fox
jumps over
the 'lazy' dog.
'''
self.assertEqual(x, y)
y = "\n\
The \"quick\"\n\
brown fox\n\
jumps over\n\
the 'lazy' dog.\n\
"
self.assertEqual(x, y)
y = '\n\
The \"quick\"\n\
brown fox\n\
jumps over\n\
the \'lazy\' dog.\n\
'
self.assertEqual(x, y)
def test_ellipsis(self):
x = ...
self.assertTrue(x is Ellipsis)
self.assertRaises(SyntaxError, eval, ".. .")
def test_eof_error(self):
samples = ("def foo(", "\ndef foo(", "def foo(\n")
for s in samples:
with self.assertRaises(SyntaxError) as cm:
compile(s, "<test>", "exec")
self.assertIn("unexpected EOF", str(cm.exception))
var_annot_global: int # a global annotated is necessary for test_var_annot
# custom namespace for testing __annotations__
class CNS:
def __init__(self):
self._dct = {}
def __setitem__(self, item, value):
self._dct[item.lower()] = value
def __getitem__(self, item):
return self._dct[item]
class GrammarTests(unittest.TestCase):
# single_input: NEWLINE | simple_stmt | compound_stmt NEWLINE
# XXX can't test in a script -- this rule is only used when interactive
# file_input: (NEWLINE | stmt)* ENDMARKER
# Being tested as this very moment this very module
# expr_input: testlist NEWLINE
# XXX Hard to test -- used only in calls to input()
def test_eval_input(self):
# testlist ENDMARKER
x = eval('1, 0 or 1')
def test_var_annot_basics(self):
# all these should be allowed
var1: int = 5
var2: [int, str]
my_lst = [42]
def one():
return 1
int.new_attr: int
[list][0]: type
my_lst[one()-1]: int = 5
self.assertEqual(my_lst, [5])
def test_var_annot_syntax_errors(self):
# parser pass
check_syntax_error(self, "def f: int")
check_syntax_error(self, "x: int: str")
check_syntax_error(self, "def f():\n"
" nonlocal x: int\n")
# AST pass
check_syntax_error(self, "[x, 0]: int\n")
check_syntax_error(self, "f(): int\n")
check_syntax_error(self, "(x,): int")
check_syntax_error(self, "def f():\n"
" (x, y): int = (1, 2)\n")
# symtable pass
check_syntax_error(self, "def f():\n"
" x: int\n"
" global x\n")
check_syntax_error(self, "def f():\n"
" global x\n"
" x: int\n")
def test_var_annot_basic_semantics(self):
# execution order
with self.assertRaises(ZeroDivisionError):
no_name[does_not_exist]: no_name_again = 1/0
with self.assertRaises(NameError):
no_name[does_not_exist]: 1/0 = 0
global var_annot_global
# function semantics
def f():
st: str = "Hello"
a.b: int = (1, 2)
return st
self.assertEqual(f.__annotations__, {})
def f_OK():
x: 1/0
f_OK()
def fbad():
x: int
print(x)
with self.assertRaises(UnboundLocalError):
fbad()
def f2bad():
(no_such_global): int
print(no_such_global)
try:
f2bad()
except Exception as e:
self.assertIs(type(e), NameError)
# class semantics
class C:
__foo: int
s: str = "attr"
z = 2
def __init__(self, x):
self.x: int = x
self.assertEqual(C.__annotations__, {'_C__foo': int, 's': str})
with self.assertRaises(NameError):
class CBad:
no_such_name_defined.attr: int = 0
with self.assertRaises(NameError):
class Cbad2(C):
x: int
x.y: list = []
def test_var_annot_metaclass_semantics(self):
class CMeta(type):
@classmethod
def __prepare__(metacls, name, bases, **kwds):
return {'__annotations__': CNS()}
class CC(metaclass=CMeta):
XX: 'ANNOT'
self.assertEqual(CC.__annotations__['xx'], 'ANNOT')
def test_var_annot_module_semantics(self):
with self.assertRaises(AttributeError):
print(test.__annotations__)
self.assertEqual(ann_module.__annotations__,
{1: 2, 'x': int, 'y': str, 'f': typing.Tuple[int, int]})
self.assertEqual(ann_module.M.__annotations__,
{'123': 123, 'o': type})
self.assertEqual(ann_module2.__annotations__, {})
def test_var_annot_in_module(self):
# check that functions fail the same way when executed
# outside of module where they were defined
from test.ann_module3 import f_bad_ann, g_bad_ann, D_bad_ann
with self.assertRaises(NameError):
f_bad_ann()
with self.assertRaises(NameError):
g_bad_ann()
with self.assertRaises(NameError):
D_bad_ann(5)
def test_var_annot_simple_exec(self):
gns = {}; lns= {}
exec("'docstring'\n"
"__annotations__[1] = 2\n"
"x: int = 5\n", gns, lns)
self.assertEqual(lns["__annotations__"], {1: 2, 'x': int})
with self.assertRaises(KeyError):
gns['__annotations__']
def test_var_annot_custom_maps(self):
# tests with custom locals() and __annotations__
ns = {'__annotations__': CNS()}
exec('X: int; Z: str = "Z"; (w): complex = 1j', ns)
self.assertEqual(ns['__annotations__']['x'], int)
self.assertEqual(ns['__annotations__']['z'], str)
with self.assertRaises(KeyError):
ns['__annotations__']['w']
nonloc_ns = {}
class CNS2:
def __init__(self):
self._dct = {}
def __setitem__(self, item, value):
nonlocal nonloc_ns
self._dct[item] = value
nonloc_ns[item] = value
def __getitem__(self, item):
return self._dct[item]
exec('x: int = 1', {}, CNS2())
self.assertEqual(nonloc_ns['__annotations__']['x'], int)
def test_var_annot_refleak(self):
# complex case: custom locals plus custom __annotations__
# this was causing refleak
cns = CNS()
nonloc_ns = {'__annotations__': cns}
class CNS2:
def __init__(self):
self._dct = {'__annotations__': cns}
def __setitem__(self, item, value):
nonlocal nonloc_ns
self._dct[item] = value
nonloc_ns[item] = value
def __getitem__(self, item):
return self._dct[item]
exec('X: str', {}, CNS2())
self.assertEqual(nonloc_ns['__annotations__']['x'], str)
def test_funcdef(self):
### [decorators] 'def' NAME parameters ['->' test] ':' suite
### decorator: '@' dotted_name [ '(' [arglist] ')' ] NEWLINE
### decorators: decorator+
### parameters: '(' [typedargslist] ')'
### typedargslist: ((tfpdef ['=' test] ',')*
### ('*' [tfpdef] (',' tfpdef ['=' test])* [',' '**' tfpdef] | '**' tfpdef)
### | tfpdef ['=' test] (',' tfpdef ['=' test])* [','])
### tfpdef: NAME [':' test]
### varargslist: ((vfpdef ['=' test] ',')*
### ('*' [vfpdef] (',' vfpdef ['=' test])* [',' '**' vfpdef] | '**' vfpdef)
### | vfpdef ['=' test] (',' vfpdef ['=' test])* [','])
### vfpdef: NAME
def f1(): pass
f1()
f1(*())
f1(*(), **{})
def f2(one_argument): pass
def f3(two, arguments): pass
self.assertEqual(f2.__code__.co_varnames, ('one_argument',))
self.assertEqual(f3.__code__.co_varnames, ('two', 'arguments'))
def a1(one_arg,): pass
def a2(two, args,): pass
def v0(*rest): pass
def v1(a, *rest): pass
def v2(a, b, *rest): pass
f1()
f2(1)
f2(1,)
f3(1, 2)
f3(1, 2,)
v0()
v0(1)
v0(1,)
v0(1,2)
v0(1,2,3,4,5,6,7,8,9,0)
v1(1)
v1(1,)
v1(1,2)
v1(1,2,3)
v1(1,2,3,4,5,6,7,8,9,0)
v2(1,2)
v2(1,2,3)
v2(1,2,3,4)
v2(1,2,3,4,5,6,7,8,9,0)
def d01(a=1): pass
d01()
d01(1)
d01(*(1,))
d01(*[] or [2])
d01(*() or (), *{} and (), **() or {})
d01(**{'a':2})
d01(**{'a':2} or {})
def d11(a, b=1): pass
d11(1)
d11(1, 2)
d11(1, **{'b':2})
def d21(a, b, c=1): pass
d21(1, 2)
d21(1, 2, 3)
d21(*(1, 2, 3))
d21(1, *(2, 3))
d21(1, 2, *(3,))
d21(1, 2, **{'c':3})
def d02(a=1, b=2): pass
d02()
d02(1)
d02(1, 2)
d02(*(1, 2))
d02(1, *(2,))
d02(1, **{'b':2})
d02(**{'a': 1, 'b': 2})
def d12(a, b=1, c=2): pass
d12(1)
d12(1, 2)
d12(1, 2, 3)
def d22(a, b, c=1, d=2): pass
d22(1, 2)
d22(1, 2, 3)
d22(1, 2, 3, 4)
def d01v(a=1, *rest): pass
d01v()
d01v(1)
d01v(1, 2)
d01v(*(1, 2, 3, 4))
d01v(*(1,))
d01v(**{'a':2})
def d11v(a, b=1, *rest): pass
d11v(1)
d11v(1, 2)
d11v(1, 2, 3)
def d21v(a, b, c=1, *rest): pass
d21v(1, 2)
d21v(1, 2, 3)
d21v(1, 2, 3, 4)
d21v(*(1, 2, 3, 4))
d21v(1, 2, **{'c': 3})
def d02v(a=1, b=2, *rest): pass
d02v()
d02v(1)
d02v(1, 2)
d02v(1, 2, 3)
d02v(1, *(2, 3, 4))
d02v(**{'a': 1, 'b': 2})
def d12v(a, b=1, c=2, *rest): pass
d12v(1)
d12v(1, 2)
d12v(1, 2, 3)
d12v(1, 2, 3, 4)
d12v(*(1, 2, 3, 4))
d12v(1, 2, *(3, 4, 5))
d12v(1, *(2,), **{'c': 3})
def d22v(a, b, c=1, d=2, *rest): pass
d22v(1, 2)
d22v(1, 2, 3)
d22v(1, 2, 3, 4)
d22v(1, 2, 3, 4, 5)
d22v(*(1, 2, 3, 4))
d22v(1, 2, *(3, 4, 5))
d22v(1, *(2, 3), **{'d': 4})
# keyword argument type tests
try:
str('x', **{b'foo':1 })
except TypeError:
pass
else:
self.fail('Bytes should not work as keyword argument names')
# keyword only argument tests
def pos0key1(*, key): return key
pos0key1(key=100)
def pos2key2(p1, p2, *, k1, k2=100): return p1,p2,k1,k2
pos2key2(1, 2, k1=100)
pos2key2(1, 2, k1=100, k2=200)
pos2key2(1, 2, k2=100, k1=200)
def pos2key2dict(p1, p2, *, k1=100, k2, **kwarg): return p1,p2,k1,k2,kwarg
pos2key2dict(1,2,k2=100,tokwarg1=100,tokwarg2=200)
pos2key2dict(1,2,tokwarg1=100,tokwarg2=200, k2=100)
self.assertRaises(SyntaxError, eval, "def f(*): pass")
self.assertRaises(SyntaxError, eval, "def f(*,): pass")
self.assertRaises(SyntaxError, eval, "def f(*, **kwds): pass")
# keyword arguments after *arglist
def f(*args, **kwargs):
return args, kwargs
self.assertEqual(f(1, x=2, *[3, 4], y=5), ((1, 3, 4),
{'x':2, 'y':5}))
self.assertEqual(f(1, *(2,3), 4), ((1, 2, 3, 4), {}))
self.assertRaises(SyntaxError, eval, "f(1, x=2, *(3,4), x=5)")
self.assertEqual(f(**{'eggs':'scrambled', 'spam':'fried'}),
((), {'eggs':'scrambled', 'spam':'fried'}))
self.assertEqual(f(spam='fried', **{'eggs':'scrambled'}),
((), {'eggs':'scrambled', 'spam':'fried'}))
# argument annotation tests
def f(x) -> list: pass
self.assertEqual(f.__annotations__, {'return': list})
def f(x: int): pass
self.assertEqual(f.__annotations__, {'x': int})
def f(*x: str): pass
self.assertEqual(f.__annotations__, {'x': str})
def f(**x: float): pass
self.assertEqual(f.__annotations__, {'x': float})
def f(x, y: 1+2): pass
self.assertEqual(f.__annotations__, {'y': 3})
def f(a, b: 1, c: 2, d): pass
self.assertEqual(f.__annotations__, {'b': 1, 'c': 2})
def f(a, b: 1, c: 2, d, e: 3 = 4, f=5, *g: 6): pass
self.assertEqual(f.__annotations__,
{'b': 1, 'c': 2, 'e': 3, 'g': 6})
def f(a, b: 1, c: 2, d, e: 3 = 4, f=5, *g: 6, h: 7, i=8, j: 9 = 10,
**k: 11) -> 12: pass
self.assertEqual(f.__annotations__,
{'b': 1, 'c': 2, 'e': 3, 'g': 6, 'h': 7, 'j': 9,
'k': 11, 'return': 12})
# Check for issue #20625 -- annotations mangling
class Spam:
def f(self, *, __kw: 1):
pass
class Ham(Spam): pass
self.assertEqual(Spam.f.__annotations__, {'_Spam__kw': 1})
self.assertEqual(Ham.f.__annotations__, {'_Spam__kw': 1})
# Check for SF Bug #1697248 - mixing decorators and a return annotation
def null(x): return x
@null
def f(x) -> list: pass
self.assertEqual(f.__annotations__, {'return': list})
# test closures with a variety of opargs
closure = 1
def f(): return closure
def f(x=1): return closure
def f(*, k=1): return closure
def f() -> int: return closure
# Check ast errors in *args and *kwargs
check_syntax_error(self, "f(*g(1=2))")
check_syntax_error(self, "f(**g(1=2))")
# Check trailing commas are permitted in funcdef argument list
def f(a,): pass
def f(*args,): pass
def f(**kwds,): pass
def f(a, *args,): pass
def f(a, **kwds,): pass
def f(*args, b,): pass
def f(*, b,): pass
def f(*args, **kwds,): pass
def f(a, *args, b,): pass
def f(a, *, b,): pass
def f(a, *args, **kwds,): pass
def f(*args, b, **kwds,): pass
def f(*, b, **kwds,): pass
def f(a, *args, b, **kwds,): pass
def f(a, *, b, **kwds,): pass
def test_lambdef(self):
### lambdef: 'lambda' [varargslist] ':' test
l1 = lambda : 0
self.assertEqual(l1(), 0)
l2 = lambda : a[d] # XXX just testing the expression
l3 = lambda : [2 < x for x in [-1, 3, 0]]
self.assertEqual(l3(), [0, 1, 0])
l4 = lambda x = lambda y = lambda z=1 : z : y() : x()
self.assertEqual(l4(), 1)
l5 = lambda x, y, z=2: x + y + z
self.assertEqual(l5(1, 2), 5)
self.assertEqual(l5(1, 2, 3), 6)
check_syntax_error(self, "lambda x: x = 2")
check_syntax_error(self, "lambda (None,): None")
l6 = lambda x, y, *, k=20: x+y+k
self.assertEqual(l6(1,2), 1+2+20)
self.assertEqual(l6(1,2,k=10), 1+2+10)
# check that trailing commas are permitted
l10 = lambda a,: 0
l11 = lambda *args,: 0
l12 = lambda **kwds,: 0
l13 = lambda a, *args,: 0
l14 = lambda a, **kwds,: 0
l15 = lambda *args, b,: 0
l16 = lambda *, b,: 0
l17 = lambda *args, **kwds,: 0
l18 = lambda a, *args, b,: 0
l19 = lambda a, *, b,: 0
l20 = lambda a, *args, **kwds,: 0
l21 = lambda *args, b, **kwds,: 0
l22 = lambda *, b, **kwds,: 0
l23 = lambda a, *args, b, **kwds,: 0
l24 = lambda a, *, b, **kwds,: 0
### stmt: simple_stmt | compound_stmt
# Tested below
def test_simple_stmt(self):
### simple_stmt: small_stmt (';' small_stmt)* [';']
x = 1; pass; del x
def foo():
# verify statements that end with semi-colons
x = 1; pass; del x;
foo()
### small_stmt: expr_stmt | pass_stmt | del_stmt | flow_stmt | import_stmt | global_stmt | access_stmt
# Tested below
def test_expr_stmt(self):
# (exprlist '=')* exprlist
1
1, 2, 3
x = 1
x = 1, 2, 3
x = y = z = 1, 2, 3
x, y, z = 1, 2, 3
abc = a, b, c = x, y, z = xyz = 1, 2, (3, 4)
check_syntax_error(self, "x + 1 = 1")
check_syntax_error(self, "a + 1 = b + 2")
# Check the heuristic for print & exec covers significant cases
# As well as placing some limits on false positives
def test_former_statements_refer_to_builtins(self):
keywords = "print", "exec"
# Cases where we want the custom error
cases = [
"{} foo",
"{} {{1:foo}}",
"if 1: {} foo",
"if 1: {} {{1:foo}}",
"if 1:\n {} foo",
"if 1:\n {} {{1:foo}}",
]
for keyword in keywords:
custom_msg = "call to '{}'".format(keyword)
for case in cases:
source = case.format(keyword)
with self.subTest(source=source):
with self.assertRaisesRegex(SyntaxError, custom_msg):
exec(source)
source = source.replace("foo", "(foo.)")
with self.subTest(source=source):
with self.assertRaisesRegex(SyntaxError, "invalid syntax"):
exec(source)
def test_del_stmt(self):
# 'del' exprlist
abc = [1,2,3]
x, y, z = abc
xyz = x, y, z
del abc
del x, y, (z, xyz)
def test_pass_stmt(self):
# 'pass'
pass
# flow_stmt: break_stmt | continue_stmt | return_stmt | raise_stmt
# Tested below
def test_break_stmt(self):
# 'break'
while 1: break
def test_continue_stmt(self):
# 'continue'
i = 1
while i: i = 0; continue
msg = ""
while not msg:
msg = "ok"
try:
continue
msg = "continue failed to continue inside try"
except:
msg = "continue inside try called except block"
if msg != "ok":
self.fail(msg)
msg = ""
while not msg:
msg = "finally block not called"
try:
continue
finally:
msg = "ok"
if msg != "ok":
self.fail(msg)
def test_break_continue_loop(self):
# This test warrants an explanation. It is a test specifically for SF bugs
# #463359 and #462937. The bug is that a 'break' statement executed or
# exception raised inside a try/except inside a loop, *after* a continue
# statement has been executed in that loop, will cause the wrong number of
# arguments to be popped off the stack and the instruction pointer reset to
# a very small number (usually 0.) Because of this, the following test
# *must* written as a function, and the tracking vars *must* be function
# arguments with default values. Otherwise, the test will loop and loop.
def test_inner(extra_burning_oil = 1, count=0):
big_hippo = 2
while big_hippo:
count += 1
try:
if extra_burning_oil and big_hippo == 1:
extra_burning_oil -= 1
break
big_hippo -= 1
continue
except:
raise
if count > 2 or big_hippo != 1:
self.fail("continue then break in try/except in loop broken!")
test_inner()
def test_return(self):
# 'return' [testlist]
def g1(): return
def g2(): return 1
g1()
x = g2()
check_syntax_error(self, "class foo:return 1")
def test_yield(self):
# Allowed as standalone statement
def g(): yield 1
def g(): yield from ()
# Allowed as RHS of assignment
def g(): x = yield 1
def g(): x = yield from ()
# Ordinary yield accepts implicit tuples
def g(): yield 1, 1
def g(): x = yield 1, 1
# 'yield from' does not
check_syntax_error(self, "def g(): yield from (), 1")
check_syntax_error(self, "def g(): x = yield from (), 1")
# Requires parentheses as subexpression
def g(): 1, (yield 1)
def g(): 1, (yield from ())
check_syntax_error(self, "def g(): 1, yield 1")
check_syntax_error(self, "def g(): 1, yield from ()")
# Requires parentheses as call argument
def g(): f((yield 1))
def g(): f((yield 1), 1)
def g(): f((yield from ()))
def g(): f((yield from ()), 1)
check_syntax_error(self, "def g(): f(yield 1)")
check_syntax_error(self, "def g(): f(yield 1, 1)")
check_syntax_error(self, "def g(): f(yield from ())")
check_syntax_error(self, "def g(): f(yield from (), 1)")
# Not allowed at top level
check_syntax_error(self, "yield")
check_syntax_error(self, "yield from")
# Not allowed at class scope
check_syntax_error(self, "class foo:yield 1")
check_syntax_error(self, "class foo:yield from ()")
# Check annotation refleak on SyntaxError
check_syntax_error(self, "def g(a:(yield)): pass")
def test_yield_in_comprehensions(self):
# Check yield in comprehensions
def g(): [x for x in [(yield 1)]]
def g(): [x for x in [(yield from ())]]
def check(code, warntext):
with self.assertWarnsRegex(DeprecationWarning, warntext):
compile(code, '<test string>', 'exec')
import warnings
with warnings.catch_warnings():
warnings.filterwarnings('error', category=DeprecationWarning)
with self.assertRaisesRegex(SyntaxError, warntext):
compile(code, '<test string>', 'exec')
check("def g(): [(yield x) for x in ()]",
"'yield' inside list comprehension")
check("def g(): [x for x in () if not (yield x)]",
"'yield' inside list comprehension")
check("def g(): [y for x in () for y in [(yield x)]]",
"'yield' inside list comprehension")
check("def g(): {(yield x) for x in ()}",
"'yield' inside set comprehension")
check("def g(): {(yield x): x for x in ()}",
"'yield' inside dict comprehension")
check("def g(): {x: (yield x) for x in ()}",
"'yield' inside dict comprehension")
check("def g(): ((yield x) for x in ())",
"'yield' inside generator expression")
check("def g(): [(yield from x) for x in ()]",
"'yield' inside list comprehension")
check("class C: [(yield x) for x in ()]",
"'yield' inside list comprehension")
check("[(yield x) for x in ()]",
"'yield' inside list comprehension")
def test_raise(self):
# 'raise' test [',' test]
try: raise RuntimeError('just testing')
except RuntimeError: pass
try: raise KeyboardInterrupt
except KeyboardInterrupt: pass
def test_import(self):
# 'import' dotted_as_names
import sys
import time, sys
# 'from' dotted_name 'import' ('*' | '(' import_as_names ')' | import_as_names)
from time import time
from time import (time)
# not testable inside a function, but already done at top of the module
# from sys import *
from sys import path, argv
from sys import (path, argv)
from sys import (path, argv,)
def test_global(self):
# 'global' NAME (',' NAME)*
global a
global a, b
global one, two, three, four, five, six, seven, eight, nine, ten
def test_nonlocal(self):
# 'nonlocal' NAME (',' NAME)*
x = 0
y = 0
def f():
nonlocal x
nonlocal x, y
def test_assert(self):
# assertTruestmt: 'assert' test [',' test]
assert 1
assert 1, 1
assert lambda x:x
assert 1, lambda x:x+1
try:
assert True
except AssertionError as e:
self.fail("'assert True' should not have raised an AssertionError")
try:
assert True, 'this should always pass'
except AssertionError as e:
self.fail("'assert True, msg' should not have "
"raised an AssertionError")
# these tests fail if python is run with -O, so check __debug__
@unittest.skipUnless(__debug__, "Won't work if __debug__ is False")
def testAssert2(self):
try:
assert 0, "msg"
except AssertionError as e:
self.assertEqual(e.args[0], "msg")
else:
self.fail("AssertionError not raised by assert 0")
try:
assert False
except AssertionError as e:
self.assertEqual(len(e.args), 0)
else:
self.fail("AssertionError not raised by 'assert False'")
### compound_stmt: if_stmt | while_stmt | for_stmt | try_stmt | funcdef | classdef
# Tested below
def test_if(self):
# 'if' test ':' suite ('elif' test ':' suite)* ['else' ':' suite]
if 1: pass
if 1: pass
else: pass
if 0: pass
elif 0: pass
if 0: pass
elif 0: pass
elif 0: pass
elif 0: pass
else: pass
def test_while(self):
# 'while' test ':' suite ['else' ':' suite]
while 0: pass
while 0: pass
else: pass
# Issue1920: "while 0" is optimized away,
# ensure that the "else" clause is still present.
x = 0
while 0:
x = 1
else:
x = 2
self.assertEqual(x, 2)
def test_for(self):
# 'for' exprlist 'in' exprlist ':' suite ['else' ':' suite]
for i in 1, 2, 3: pass
for i, j, k in (): pass
else: pass
class Squares:
def __init__(self, max):
self.max = max
self.sofar = []
def __len__(self): return len(self.sofar)
def __getitem__(self, i):
if not 0 <= i < self.max: raise IndexError
n = len(self.sofar)
while n <= i:
self.sofar.append(n*n)
n = n+1
return self.sofar[i]
n = 0
for x in Squares(10): n = n+x
if n != 285:
self.fail('for over growing sequence')
result = []
for x, in [(1,), (2,), (3,)]:
result.append(x)
self.assertEqual(result, [1, 2, 3])
def test_try(self):
### try_stmt: 'try' ':' suite (except_clause ':' suite)+ ['else' ':' suite]
### | 'try' ':' suite 'finally' ':' suite
### except_clause: 'except' [expr ['as' expr]]
try:
1/0
except ZeroDivisionError:
pass
else:
pass
try: 1/0
except EOFError: pass
except TypeError as msg: pass
except RuntimeError as msg: pass
except: pass
else: pass
try: 1/0
except (EOFError, TypeError, ZeroDivisionError): pass
try: 1/0
except (EOFError, TypeError, ZeroDivisionError) as msg: pass
try: pass
finally: pass
def test_suite(self):
# simple_stmt | NEWLINE INDENT NEWLINE* (stmt NEWLINE*)+ DEDENT
if 1: pass
if 1:
pass
if 1:
#
#
#
pass
pass
#
pass
#
def test_test(self):
### and_test ('or' and_test)*
### and_test: not_test ('and' not_test)*
### not_test: 'not' not_test | comparison
if not 1: pass
if 1 and 1: pass
if 1 or 1: pass
if not not not 1: pass
if not 1 and 1 and 1: pass
if 1 and 1 or 1 and 1 and 1 or not 1 and 1: pass
def test_comparison(self):
### comparison: expr (comp_op expr)*
### comp_op: '<'|'>'|'=='|'>='|'<='|'!='|'in'|'not' 'in'|'is'|'is' 'not'
if 1: pass
x = (1 == 1)
if 1 == 1: pass
if 1 != 1: pass
if 1 < 1: pass
if 1 > 1: pass
if 1 <= 1: pass
if 1 >= 1: pass
if 1 is 1: pass
if 1 is not 1: pass
if 1 in (): pass
if 1 not in (): pass
if 1 < 1 > 1 == 1 >= 1 <= 1 != 1 in 1 not in 1 is 1 is not 1: pass
def test_binary_mask_ops(self):
x = 1 & 1
x = 1 ^ 1
x = 1 | 1
def test_shift_ops(self):
x = 1 << 1
x = 1 >> 1
x = 1 << 1 >> 1
def test_additive_ops(self):
x = 1
x = 1 + 1
x = 1 - 1 - 1
x = 1 - 1 + 1 - 1 + 1
def test_multiplicative_ops(self):
x = 1 * 1
x = 1 / 1
x = 1 % 1
x = 1 / 1 * 1 % 1
def test_unary_ops(self):
x = +1
x = -1
x = ~1
x = ~1 ^ 1 & 1 | 1 & 1 ^ -1
x = -1*1/1 + 1*1 - ---1*1
def test_selectors(self):
### trailer: '(' [testlist] ')' | '[' subscript ']' | '.' NAME
### subscript: expr | [expr] ':' [expr]
import sys, time
c = sys.path[0]
x = time.time()
x = sys.modules['time'].time()
a = '01234'
c = a[0]
c = a[-1]
s = a[0:5]
s = a[:5]
s = a[0:]
s = a[:]
s = a[-5:]
s = a[:-1]
s = a[-4:-3]
# A rough test of SF bug 1333982. http://python.org/sf/1333982
# The testing here is fairly incomplete.
# Test cases should include: commas with 1 and 2 colons
d = {}
d[1] = 1
d[1,] = 2
d[1,2] = 3
d[1,2,3] = 4
L = list(d)
L.sort(key=lambda x: x if isinstance(x, tuple) else ())
self.assertEqual(str(L), '[1, (1,), (1, 2), (1, 2, 3)]')
def test_atoms(self):
### atom: '(' [testlist] ')' | '[' [testlist] ']' | '{' [dictsetmaker] '}' | NAME | NUMBER | STRING
### dictsetmaker: (test ':' test (',' test ':' test)* [',']) | (test (',' test)* [','])
x = (1)
x = (1 or 2 or 3)
x = (1 or 2 or 3, 2, 3)
x = []
x = [1]
x = [1 or 2 or 3]
x = [1 or 2 or 3, 2, 3]
x = []
x = {}
x = {'one': 1}
x = {'one': 1,}
x = {'one' or 'two': 1 or 2}
x = {'one': 1, 'two': 2}
x = {'one': 1, 'two': 2,}
x = {'one': 1, 'two': 2, 'three': 3, 'four': 4, 'five': 5, 'six': 6}
x = {'one'}
x = {'one', 1,}
x = {'one', 'two', 'three'}
x = {2, 3, 4,}
x = x
x = 'x'
x = 123
### exprlist: expr (',' expr)* [',']
### testlist: test (',' test)* [',']
# These have been exercised enough above
def test_classdef(self):
# 'class' NAME ['(' [testlist] ')'] ':' suite
class B: pass
class B2(): pass
class C1(B): pass
class C2(B): pass
class D(C1, C2, B): pass
class C:
def meth1(self): pass
def meth2(self, arg): pass
def meth3(self, a1, a2): pass
# decorator: '@' dotted_name [ '(' [arglist] ')' ] NEWLINE
# decorators: decorator+
# decorated: decorators (classdef | funcdef)
def class_decorator(x): return x
@class_decorator
class G: pass
def test_dictcomps(self):
# dictorsetmaker: ( (test ':' test (comp_for |
# (',' test ':' test)* [','])) |
# (test (comp_for | (',' test)* [','])) )
nums = [1, 2, 3]
self.assertEqual({i:i+1 for i in nums}, {1: 2, 2: 3, 3: 4})
def test_listcomps(self):
# list comprehension tests
nums = [1, 2, 3, 4, 5]
strs = ["Apple", "Banana", "Coconut"]
spcs = [" Apple", " Banana ", "Coco nut "]
self.assertEqual([s.strip() for s in spcs], ['Apple', 'Banana', 'Coco nut'])
self.assertEqual([3 * x for x in nums], [3, 6, 9, 12, 15])
self.assertEqual([x for x in nums if x > 2], [3, 4, 5])
self.assertEqual([(i, s) for i in nums for s in strs],
[(1, 'Apple'), (1, 'Banana'), (1, 'Coconut'),
(2, 'Apple'), (2, 'Banana'), (2, 'Coconut'),
(3, 'Apple'), (3, 'Banana'), (3, 'Coconut'),
(4, 'Apple'), (4, 'Banana'), (4, 'Coconut'),
(5, 'Apple'), (5, 'Banana'), (5, 'Coconut')])
self.assertEqual([(i, s) for i in nums for s in [f for f in strs if "n" in f]],
[(1, 'Banana'), (1, 'Coconut'), (2, 'Banana'), (2, 'Coconut'),
(3, 'Banana'), (3, 'Coconut'), (4, 'Banana'), (4, 'Coconut'),
(5, 'Banana'), (5, 'Coconut')])
self.assertEqual([(lambda a:[a**i for i in range(a+1)])(j) for j in range(5)],
[[1], [1, 1], [1, 2, 4], [1, 3, 9, 27], [1, 4, 16, 64, 256]])
def test_in_func(l):
return [0 < x < 3 for x in l if x > 2]
self.assertEqual(test_in_func(nums), [False, False, False])
def test_nested_front():
self.assertEqual([[y for y in [x, x + 1]] for x in [1,3,5]],
[[1, 2], [3, 4], [5, 6]])
test_nested_front()
check_syntax_error(self, "[i, s for i in nums for s in strs]")
check_syntax_error(self, "[x if y]")
suppliers = [
(1, "Boeing"),
(2, "Ford"),
(3, "Macdonalds")
]
parts = [
(10, "Airliner"),
(20, "Engine"),
(30, "Cheeseburger")
]
suppart = [
(1, 10), (1, 20), (2, 20), (3, 30)
]
x = [
(sname, pname)
for (sno, sname) in suppliers
for (pno, pname) in parts
for (sp_sno, sp_pno) in suppart
if sno == sp_sno and pno == sp_pno
]
self.assertEqual(x, [('Boeing', 'Airliner'), ('Boeing', 'Engine'), ('Ford', 'Engine'),
('Macdonalds', 'Cheeseburger')])
def test_genexps(self):
# generator expression tests
g = ([x for x in range(10)] for x in range(1))
self.assertEqual(next(g), [x for x in range(10)])
try:
next(g)
self.fail('should produce StopIteration exception')
except StopIteration:
pass
a = 1
try:
g = (a for d in a)
next(g)
self.fail('should produce TypeError')
except TypeError:
pass
self.assertEqual(list((x, y) for x in 'abcd' for y in 'abcd'), [(x, y) for x in 'abcd' for y in 'abcd'])
self.assertEqual(list((x, y) for x in 'ab' for y in 'xy'), [(x, y) for x in 'ab' for y in 'xy'])
a = [x for x in range(10)]
b = (x for x in (y for y in a))
self.assertEqual(sum(b), sum([x for x in range(10)]))
self.assertEqual(sum(x**2 for x in range(10)), sum([x**2 for x in range(10)]))
self.assertEqual(sum(x*x for x in range(10) if x%2), sum([x*x for x in range(10) if x%2]))
self.assertEqual(sum(x for x in (y for y in range(10))), sum([x for x in range(10)]))
self.assertEqual(sum(x for x in (y for y in (z for z in range(10)))), sum([x for x in range(10)]))
self.assertEqual(sum(x for x in [y for y in (z for z in range(10))]), sum([x for x in range(10)]))
self.assertEqual(sum(x for x in (y for y in (z for z in range(10) if True)) if True), sum([x for x in range(10)]))
self.assertEqual(sum(x for x in (y for y in (z for z in range(10) if True) if False) if True), 0)
check_syntax_error(self, "foo(x for x in range(10), 100)")
check_syntax_error(self, "foo(100, x for x in range(10))")
def test_comprehension_specials(self):
# test for outmost iterable precomputation
x = 10; g = (i for i in range(x)); x = 5
self.assertEqual(len(list(g)), 10)
# This should hold, since we're only precomputing outmost iterable.
x = 10; t = False; g = ((i,j) for i in range(x) if t for j in range(x))
x = 5; t = True;
self.assertEqual([(i,j) for i in range(10) for j in range(5)], list(g))
# Grammar allows multiple adjacent 'if's in listcomps and genexps,
# even though it's silly. Make sure it works (ifelse broke this.)
self.assertEqual([ x for x in range(10) if x % 2 if x % 3 ], [1, 5, 7])
self.assertEqual(list(x for x in range(10) if x % 2 if x % 3), [1, 5, 7])
# verify unpacking single element tuples in listcomp/genexp.
self.assertEqual([x for x, in [(4,), (5,), (6,)]], [4, 5, 6])
self.assertEqual(list(x for x, in [(7,), (8,), (9,)]), [7, 8, 9])
def test_with_statement(self):
class manager(object):
def __enter__(self):
return (1, 2)
def __exit__(self, *args):
pass
with manager():
pass
with manager() as x:
pass
with manager() as (x, y):
pass
with manager(), manager():
pass
with manager() as x, manager() as y:
pass
with manager() as x, manager():
pass
def test_if_else_expr(self):
# Test ifelse expressions in various cases
def _checkeval(msg, ret):
"helper to check that evaluation of expressions is done correctly"
print(msg)
return ret
# the next line is not allowed anymore
#self.assertEqual([ x() for x in lambda: True, lambda: False if x() ], [True])
self.assertEqual([ x() for x in (lambda: True, lambda: False) if x() ], [True])
self.assertEqual([ x(False) for x in (lambda x: False if x else True, lambda x: True if x else False) if x(False) ], [True])
self.assertEqual((5 if 1 else _checkeval("check 1", 0)), 5)
self.assertEqual((_checkeval("check 2", 0) if 0 else 5), 5)
self.assertEqual((5 and 6 if 0 else 1), 1)
self.assertEqual(((5 and 6) if 0 else 1), 1)
self.assertEqual((5 and (6 if 1 else 1)), 6)
self.assertEqual((0 or _checkeval("check 3", 2) if 0 else 3), 3)
self.assertEqual((1 or _checkeval("check 4", 2) if 1 else _checkeval("check 5", 3)), 1)
self.assertEqual((0 or 5 if 1 else _checkeval("check 6", 3)), 5)
self.assertEqual((not 5 if 1 else 1), False)
self.assertEqual((not 5 if 0 else 1), 1)
self.assertEqual((6 + 1 if 1 else 2), 7)
self.assertEqual((6 - 1 if 1 else 2), 5)
self.assertEqual((6 * 2 if 1 else 4), 12)
self.assertEqual((6 / 2 if 1 else 3), 3)
self.assertEqual((6 < 4 if 0 else 2), 2)
def test_paren_evaluation(self):
self.assertEqual(16 // (4 // 2), 8)
self.assertEqual((16 // 4) // 2, 2)
self.assertEqual(16 // 4 // 2, 2)
self.assertTrue(False is (2 is 3))
self.assertFalse((False is 2) is 3)
self.assertFalse(False is 2 is 3)
def test_matrix_mul(self):
# This is not intended to be a comprehensive test, rather just to be few
# samples of the @ operator in test_grammar.py.
class M:
def __matmul__(self, o):
return 4
def __imatmul__(self, o):
self.other = o
return self
m = M()
self.assertEqual(m @ m, 4)
m @= 42
self.assertEqual(m.other, 42)
def test_async_await(self):
async def test():
def sum():
pass
if 1:
await someobj()
self.assertEqual(test.__name__, 'test')
self.assertTrue(bool(test.__code__.co_flags & inspect.CO_COROUTINE))
def decorator(func):
setattr(func, '_marked', True)
return func
@decorator
async def test2():
return 22
self.assertTrue(test2._marked)
self.assertEqual(test2.__name__, 'test2')
self.assertTrue(bool(test2.__code__.co_flags & inspect.CO_COROUTINE))
def test_async_for(self):
class Done(Exception): pass
class AIter:
def __aiter__(self):
return self
async def __anext__(self):
raise StopAsyncIteration
async def foo():
async for i in AIter():
pass
async for i, j in AIter():
pass
async for i in AIter():
pass
else:
pass
raise Done
with self.assertRaises(Done):
foo().send(None)
def test_async_with(self):
class Done(Exception): pass
class manager:
async def __aenter__(self):
return (1, 2)
async def __aexit__(self, *exc):
return False
async def foo():
async with manager():
pass
async with manager() as x:
pass
async with manager() as (x, y):
pass
async with manager(), manager():
pass
async with manager() as x, manager() as y:
pass
async with manager() as x, manager():
pass
raise Done
with self.assertRaises(Done):
foo().send(None)
if __name__ == '__main__':
unittest.main()
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