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Commit 60d1456e authored by Georg Brandl's avatar Georg Brandl
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Merge r60522 from trunk.

parent 479a7e7a
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Lib/test/test_funcattrs.py
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from test.test_support import verbose, TestFailed, verify
from test import test_support
import types
class F:
def a(self):
pass
def b():
'my docstring'
pass
# __module__ is a special attribute
verify(b.__module__ == __name__)
verify(verify.__module__ == "test.test_support")
# setting attributes on functions
try:
b.publish
except AttributeError: pass
else: raise TestFailed('expected AttributeError')
if b.__dict__ != {}:
raise TestFailed('expected unassigned func.__dict__ to be {}')
b.publish = 1
if b.publish != 1:
raise TestFailed('function attribute not set to expected value')
docstring = 'its docstring'
b.__doc__ = docstring
if b.__doc__ != docstring:
raise TestFailed('problem with setting __doc__ attribute')
if 'publish' not in dir(b):
raise TestFailed('attribute not in dir()')
try:
del b.__dict__
except TypeError: pass
else: raise TestFailed('del func.__dict__ expected TypeError')
b.publish = 1
try:
b.__dict__ = None
except TypeError: pass
else: raise TestFailed('func.__dict__ = None expected TypeError')
d = {'hello': 'world'}
b.__dict__ = d
if b.__dict__ is not d:
raise TestFailed('func.__dict__ assignment to dictionary failed')
if b.hello != 'world':
raise TestFailed('attribute after func.__dict__ assignment failed')
f1 = F()
f2 = F()
try:
F.a.publish
except AttributeError: pass
else: raise TestFailed('expected AttributeError')
try:
f1.a.publish
except AttributeError: pass
else: raise TestFailed('expected AttributeError')
# In Python 2.1 beta 1, we disallowed setting attributes on unbound methods
# (it was already disallowed on bound methods). See the PEP for details.
# In Python 3.0 unbound methods are gone.
F.a.publish = 1
if F.a.publish != 1:
raise TestFailed('unbound method attribute not set to expected value')
if f1.a.publish != 1:
raise TestFailed('bound method attribute access did not work')
if f2.a.publish != 1:
raise TestFailed('bound method attribute access did not work')
if 'publish' not in dir(F.a):
raise TestFailed('attribute not in dir()')
try:
f1.a.publish = 0
except (AttributeError, TypeError): pass
else: raise TestFailed('expected AttributeError or TypeError')
# try setting __dict__
F.a.__dict__ = {'one': 11, 'two': 22, 'three': 33}
if f1.a.two != 22:
raise TestFailed('setting __dict__')
from UserDict import UserDict
d = UserDict({'four': 44, 'five': 55})
try:
F.a.__dict__ = d
except (AttributeError, TypeError): pass
else: raise TestFailed
if f2.a.one != f1.a.one != F.a.one != 11:
raise TestFailed
# __func__ may not be a Python method!
import types
F.id = id
eff = F()
eff.id = types.MethodType(id, eff)
if eff.id() != id(eff):
raise TestFailed
try:
F.id.foo
except AttributeError: pass
else: raise TestFailed
try:
F.id.foo = 12
except (AttributeError, TypeError): pass
else: raise TestFailed
try:
F.id.foo
except AttributeError: pass
else: raise TestFailed
try:
eff.id.foo
except AttributeError: pass
else: raise TestFailed
try:
eff.id.foo = 12
except (AttributeError, TypeError): pass
else: raise TestFailed
try:
eff.id.foo
except AttributeError: pass
else: raise TestFailed
# Regression test for a crash in pre-2.1a1
def another():
pass
try:
del another.__dict__
except TypeError: pass
else: raise TestFailed
try:
del another.__dict__
except TypeError: pass
else: raise TestFailed
try:
another.__dict__ = None
except TypeError: pass
else: raise TestFailed
try:
del another.bar
except AttributeError: pass
else: raise TestFailed
# This isn't specifically related to function attributes, but it does test a
# core dump regression in funcobject.c
del another.__defaults__
def foo():
pass
def bar():
pass
def temp():
print(1)
if foo==bar:
raise TestFailed
d={}
d[foo] = 1
foo.__code__ = temp.__code__
d[foo]
# Test all predefined function attributes systematically
def cantset(obj, name, value, exception=(AttributeError, TypeError)):
verify(hasattr(obj, name)) # Otherwise it's probably a typo
try:
setattr(obj, name, value)
except exception:
pass
else:
raise TestFailed("shouldn't be able to set %s to %r" % (name, value))
try:
delattr(obj, name)
except (AttributeError, TypeError):
pass
else:
raise TestFailed("shouldn't be able to del %s" % name)
def test_func_closure():
a = 12
def f(): print(a)
c = f.__closure__
verify(isinstance(c, tuple))
verify(len(c) == 1)
verify(c[0].__class__.__name__ == "cell") # don't have a type object handy
cantset(f, "__closure__", c)
def test_empty_cell():
def f(): print(a)
try:
f.__closure__[0].cell_contents
except ValueError:
pass
else:
raise TestFailed("shouldn't be able to read an empty cell")
a = 12
def test_func_doc():
def f(): pass
verify(f.__doc__ is None)
f.__doc__ = "hello"
verify(f.__doc__ == "hello")
del f.__doc__
verify(f.__doc__ is None)
def test_func_globals():
def f(): pass
verify(f.__globals__ is globals())
cantset(f, "__globals__", globals())
def test_func_name():
def f(): pass
verify(f.__name__ == "f")
f.__name__ = "g"
verify(f.__name__ == "g")
cantset(f, "__globals__", 1)
cantset(f, "__name__", 1)
# test that you can access func.__name__ in restricted mode
s = """def f(): pass\nf.__name__"""
exec(s, {'__builtins__':{}})
def test_func_code():
a = b = 24
def f(): pass
def g(): print(12)
def f1(): print(a)
def g1(): print(b)
def f2(): print(a, b)
verify(type(f.__code__) is types.CodeType)
f.__code__ = g.__code__
cantset(f, "__code__", None)
# can't change the number of free vars
cantset(f, "__code__", f1.__code__, exception=ValueError)
cantset(f1, "__code__", f.__code__, exception=ValueError)
cantset(f1, "__code__", f2.__code__, exception=ValueError)
f1.__code__ = g1.__code__
def test_func_defaults():
def f(a, b): return (a, b)
verify(f.__defaults__ is None)
f.__defaults__ = (1, 2)
verify(f.__defaults__ == (1, 2))
verify(f(10) == (10, 2))
def g(a=1, b=2): return (a, b)
verify(g.__defaults__ == (1, 2))
del g.__defaults__
verify(g.__defaults__ is None)
try:
g()
except TypeError:
pass
else:
raise TestFailed("shouldn't be allowed to call g() w/o defaults")
def test_func_dict():
def f(): pass
a = f.__dict__
verify(a == {})
f.hello = 'world'
verify(a == {'hello': 'world'})
verify(a is f.__dict__)
f.__dict__ = {'world': 'hello'}
verify(f.world == "hello")
verify(f.__dict__ == {'world': 'hello'})
cantset(f, "__dict__", None)
def test___self__():
class C:
def foo(self): pass
#verify(C.foo.__self__.__class__ is C)
verify(C().foo.__self__.__class__ is C)
#cantset(C.foo, "__self__.__class__", C)
cantset(C().foo, "__self__.__class__", C)
def test___func__():
def foo(self): pass
class C:
pass
C.foo = foo
#verify(C.foo.__func__ is foo)
verify(C().foo.__func__ is foo)
#cantset(C.foo, "__func__", foo)
cantset(C().foo, "__func__", foo)
def test___self__():
class C:
def foo(self): pass
#verify(C.foo.__self__ is None)
c = C()
#verify(c.foo.__self__ is c)
#cantset(C.foo, "__self__", None)
#cantset(c.foo, "__self__", c)
def test_im_dict():
class C:
def foo(self): pass
foo.bar = 42
verify(C.foo.__dict__ == {'bar': 42})
verify(C().foo.__dict__ == {'bar': 42})
#cantset(C.foo, "__dict__", C.foo.__dict__)
#cantset(C().foo, "__dict__", C.foo.__dict__)
def test_im_doc():
class C:
def foo(self): "hello"
verify(C.foo.__doc__ == "hello")
verify(C().foo.__doc__ == "hello")
#cantset(C.foo, "__doc__", "hello")
#cantset(C().foo, "__doc__", "hello")
def test_im_name():
class C:
def foo(self): pass
verify(C.foo.__name__ == "foo")
verify(C().foo.__name__ == "foo")
#cantset(C.foo, "__name__", "foo")
#cantset(C().foo, "__name__", "foo")
def testmore():
test_func_closure()
test_empty_cell()
test_func_doc()
test_func_globals()
test_func_name()
test_func_code()
test_func_defaults()
test_func_dict()
# Tests for instance method attributes
test___self__()
test___func__()
test___self__()
test_im_dict()
test_im_doc()
test_im_name()
testmore()
import unittest
class FuncAttrsTest(unittest.TestCase):
def setUp(self):
class F:
def a(self):
pass
def b():
return 3
self.fi = F()
self.F = F
self.b = b
def cannot_set_attr(self, obj, name, value, exceptions):
try:
setattr(obj, name, value)
except exceptions:
pass
else:
self.fail("shouldn't be able to set %s to %r" % (name, value))
try:
delattr(obj, name)
except exceptions:
pass
else:
self.fail("shouldn't be able to del %s" % name)
class FunctionPropertiesTest(FuncAttrsTest):
# Include the external setUp method that is common to all tests
def test_module(self):
self.assertEqual(self.b.__module__, __name__)
def test_dir_includes_correct_attrs(self):
self.b.known_attr = 7
self.assert_('known_attr' in dir(self.b),
"set attributes not in dir listing of method")
# Test on underlying function object of method
self.F.a.known_attr = 7
self.assert_('known_attr' in dir(self.fi.a), "set attribute on function "
"implementations, should show up in next dir")
def test_duplicate_function_equality(self):
# Body of `duplicate' is the exact same as self.b
def duplicate():
'my docstring'
return 3
self.assertNotEqual(self.b, duplicate)
def test_copying___code__(self):
def test(): pass
self.assertEqual(test(), None)
test.__code__ = self.b.__code__
self.assertEqual(test(), 3) # self.b always returns 3, arbitrarily
def test___globals__(self):
self.assertEqual(self.b.__globals__, globals())
self.cannot_set_attr(self.b, '__globals__', 2, (AttributeError, TypeError))
def test___name__(self):
self.assertEqual(self.b.__name__, 'b')
self.b.__name__ = 'c'
self.assertEqual(self.b.__name__, 'c')
self.b.__name__ = 'd'
self.assertEqual(self.b.__name__, 'd')
# __name__ and __name__ must be a string
self.cannot_set_attr(self.b, '__name__', 7, TypeError)
# __name__ must be available when in restricted mode. Exec will raise
# AttributeError if __name__ is not available on f.
s = """def f(): pass\nf.__name__"""
exec(s, {'__builtins__': {}})
# Test on methods, too
self.assertEqual(self.fi.a.__name__, 'a')
self.cannot_set_attr(self.fi.a, "__name__", 'a', AttributeError)
def test___code__(self):
num_one, num_two = 7, 8
def a(): pass
def b(): return 12
def c(): return num_one
def d(): return num_two
def e(): return num_one, num_two
for func in [a, b, c, d, e]:
self.assertEqual(type(func.__code__), types.CodeType)
self.assertEqual(c(), 7)
self.assertEqual(d(), 8)
d.__code__ = c.__code__
self.assertEqual(c.__code__, d.__code__)
self.assertEqual(c(), 7)
# self.assertEqual(d(), 7)
try: b.__code__ = c.__code__
except ValueError: pass
else: self.fail(
"__code__ with different numbers of free vars should not be "
"possible")
try: e.__code__ = d.__code__
except ValueError: pass
else: self.fail(
"__code__ with different numbers of free vars should not be "
"possible")
def test_blank_func_defaults(self):
self.assertEqual(self.b.__defaults__, None)
del self.b.__defaults__
self.assertEqual(self.b.__defaults__, None)
def test_func_default_args(self):
def first_func(a, b):
return a+b
def second_func(a=1, b=2):
return a+b
self.assertEqual(first_func.__defaults__, None)
self.assertEqual(second_func.__defaults__, (1, 2))
first_func.__defaults__ = (1, 2)
self.assertEqual(first_func.__defaults__, (1, 2))
self.assertEqual(first_func(), 3)
self.assertEqual(first_func(3), 5)
self.assertEqual(first_func(3, 5), 8)
del second_func.__defaults__
self.assertEqual(second_func.__defaults__, None)
try: second_func()
except TypeError: pass
else: self.fail(
"func_defaults does not update; deleting it does not remove "
"requirement")
class ImplicitReferencesTest(FuncAttrsTest):
def test___class__(self):
self.assertEqual(self.fi.a.__self__.__class__, self.F)
self.cannot_set_attr(self.fi.a, "__class__", self.F, TypeError)
def test___func__(self):
self.assertEqual(self.fi.a.__func__, self.F.a)
self.cannot_set_attr(self.fi.a, "__func__", self.F.a, AttributeError)
def test___self__(self):
self.assertEqual(self.fi.a.__self__, self.fi)
self.cannot_set_attr(self.fi.a, "__self__", self.fi, AttributeError)
def test___func___non_method(self):
# Behavior should be the same when a method is added via an attr
# assignment
self.fi.id = types.MethodType(id, self.fi)
self.assertEqual(self.fi.id(), id(self.fi))
# Test usage
try: self.fi.id.unknown_attr
except AttributeError: pass
else: self.fail("using unknown attributes should raise AttributeError")
# Test assignment and deletion
self.cannot_set_attr(self.fi.id, 'unknown_attr', 2, AttributeError)
class ArbitraryFunctionAttrTest(FuncAttrsTest):
def test_set_attr(self):
self.b.known_attr = 7
self.assertEqual(self.b.known_attr, 7)
try: self.fi.a.known_attr = 7
except AttributeError: pass
else: self.fail("setting attributes on methods should raise error")
def test_delete_unknown_attr(self):
try: del self.b.unknown_attr
except AttributeError: pass
else: self.fail("deleting unknown attribute should raise TypeError")
def test_unset_attr(self):
for func in [self.b, self.fi.a]:
try: func.non_existant_attr
except AttributeError: pass
else: self.fail("using unknown attributes should raise "
"AttributeError")
class FunctionDictsTest(FuncAttrsTest):
def test_setting_dict_to_invalid(self):
self.cannot_set_attr(self.b, '__dict__', None, TypeError)
from UserDict import UserDict
d = UserDict({'known_attr': 7})
self.cannot_set_attr(self.fi.a.__func__, '__dict__', d, TypeError)
def test_setting_dict_to_valid(self):
d = {'known_attr': 7}
self.b.__dict__ = d
# Test assignment
self.assertEqual(d, self.b.__dict__)
# ... and on all the different ways of referencing the method's func
self.F.a.__dict__ = d
self.assertEqual(d, self.fi.a.__func__.__dict__)
self.assertEqual(d, self.fi.a.__dict__)
# Test value
self.assertEqual(self.b.known_attr, 7)
self.assertEqual(self.b.__dict__['known_attr'], 7)
# ... and again, on all the different method's names
self.assertEqual(self.fi.a.__func__.known_attr, 7)
self.assertEqual(self.fi.a.known_attr, 7)
def test_delete___dict__(self):
try: del self.b.__dict__
except TypeError: pass
else: self.fail("deleting function dictionary should raise TypeError")
def test_unassigned_dict(self):
self.assertEqual(self.b.__dict__, {})
def test_func_as_dict_key(self):
value = "Some string"
d = {}
d[self.b] = value
self.assertEqual(d[self.b], value)
class FunctionDocstringTest(FuncAttrsTest):
def test_set_docstring_attr(self):
self.assertEqual(self.b.__doc__, None)
docstr = "A test method that does nothing"
self.b.__doc__ = docstr
self.F.a.__doc__ = docstr
self.assertEqual(self.b.__doc__, docstr)
self.assertEqual(self.fi.a.__doc__, docstr)
self.cannot_set_attr(self.fi.a, "__doc__", docstr, AttributeError)
def test_delete_docstring(self):
self.b.__doc__ = "The docstring"
del self.b.__doc__
self.assertEqual(self.b.__doc__, None)
def test_main():
test_support.run_unittest(FunctionPropertiesTest, ImplicitReferencesTest,
ArbitraryFunctionAttrTest, FunctionDictsTest,
FunctionDocstringTest)
if __name__ == "__main__":
test_main()
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