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cpython/Lib/test/test_grammar.py
Nick Coghlan 1f7ce62bd6 Implement PEP 380 - 'yield from' (closes #11682)
2012-01-13 21:43:40 +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 run_unittest, check_syntax_error
import unittest
import sys
# testing import *
from sys import *
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_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))
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_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(**{'a':2})
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)
# 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.assertRaises(SyntaxError, eval, "f(1, *(2,3), 4)")
self.assertRaises(SyntaxError, eval, "f(1, x=2, *(3,4), x=5)")
# 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 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 MAKE_CLOSURE with a variety of oparg's
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))")
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)
### 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")
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 ()")
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(x)
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_main():
run_unittest(TokenTests, GrammarTests)
if __name__ == '__main__':
test_main()
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