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bpo-39702: Relax grammar restrictions on decorators (PEP 614) (GH-18570)

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Brandt Bucher 2020-03-03 14:25:44 -08:00 • committed by GitHub
parent 116fd4af73
commit be501ca241
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8 changed files with 534 additions and 537 deletions
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32
Lib/test/test_grammar.py
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@ -460,7 +460,7 @@ class GrammarTests(unittest.TestCase):
def test_funcdef(self):
### [decorators] 'def' NAME parameters ['->' test] ':' suite
### decorator: '@' dotted_name [ '(' [arglist] ')' ] NEWLINE
### decorator: '@' namedexpr_test NEWLINE
### decorators: decorator+
### parameters: '(' [typedargslist] ')'
### typedargslist: ((tfpdef ['=' test] ',')*
@ -666,6 +666,20 @@ class GrammarTests(unittest.TestCase):
def f(x) -> list: pass
self.assertEqual(f.__annotations__, {'return': list})
# Test expressions as decorators (PEP 614):
@False or null
def f(x): pass
@d := null
def f(x): pass
@lambda f: null(f)
def f(x): pass
@[..., null, ...][1]
def f(x): pass
@null(null)(null)
def f(x): pass
@[null][0].__call__.__call__
def f(x): pass
# test closures with a variety of opargs
closure = 1
def f(): return closure
@ -1515,13 +1529,27 @@ class GrammarTests(unittest.TestCase):
def meth2(self, arg): pass
def meth3(self, a1, a2): pass
# decorator: '@' dotted_name [ '(' [arglist] ')' ] NEWLINE
# decorator: '@' namedexpr_test NEWLINE
# decorators: decorator+
# decorated: decorators (classdef | funcdef)
def class_decorator(x): return x
@class_decorator
class G: pass
# Test expressions as decorators (PEP 614):
@False or class_decorator
class H: pass
@d := class_decorator
class I: pass
@lambda c: class_decorator(c)
class J: pass
@[..., class_decorator, ...][1]
class K: pass
@class_decorator(class_decorator)(class_decorator)
class L: pass
@[class_decorator][0].__call__.__call__
class M: pass
def test_dictcomps(self):
# dictorsetmaker: ( (test ':' test (comp_for |
# (',' test ':' test)* [','])) |