lib-python.2.5.test.test_funcattrs.py Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jython Show documentation
Show all versions of jython Show documentation
Jython is an implementation of the high-level, dynamic, object-oriented
language Python written in 100% Pure Java, and seamlessly integrated with
the Java platform. It thus allows you to run Python on any Java platform.
from test.test_support import verbose, TestFailed, verify
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.func_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.
try:
F.a.publish = 1
except (AttributeError, TypeError): pass
else: raise TestFailed, 'expected AttributeError or TypeError'
# But setting it explicitly on the underlying function object is okay.
F.a.im_func.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'
# See the comment above about the change in semantics for Python 2.1b1
try:
F.a.myclass = F
except (AttributeError, TypeError): pass
else: raise TestFailed, 'expected AttributeError or TypeError'
F.a.im_func.myclass = F
f1.a.myclass
f2.a.myclass
f1.a.myclass
F.a.myclass
if f1.a.myclass is not f2.a.myclass or \
f1.a.myclass is not F.a.myclass:
raise TestFailed, 'attributes were not the same'
# try setting __dict__
try:
F.a.__dict__ = (1, 2, 3)
except (AttributeError, TypeError): pass
else: raise TestFailed, 'expected TypeError or AttributeError'
F.a.im_func.__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
# im_func may not be a Python method!
import new
F.id = new.instancemethod(id, None, F)
eff = F()
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.func_dict
except TypeError: pass
else: raise TestFailed
try:
another.func_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.func_defaults
def foo():
pass
def bar():
pass
def temp():
print 1
if foo==bar:
raise TestFailed
d={}
d[foo] = 1
foo.func_code = temp.func_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.func_closure
verify(isinstance(c, tuple))
verify(len(c) == 1)
verify(c[0].__class__.__name__ == "cell") # don't have a type object handy
cantset(f, "func_closure", c)
def test_empty_cell():
def f(): print a
try:
f.func_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)
verify(f.func_doc is None)
f.__doc__ = "hello"
verify(f.__doc__ == "hello")
verify(f.func_doc == "hello")
del f.__doc__
verify(f.__doc__ is None)
verify(f.func_doc is None)
f.func_doc = "world"
verify(f.__doc__ == "world")
verify(f.func_doc == "world")
del f.func_doc
verify(f.func_doc is None)
verify(f.__doc__ is None)
def test_func_globals():
def f(): pass
verify(f.func_globals is globals())
cantset(f, "func_globals", globals())
def test_func_name():
def f(): pass
verify(f.__name__ == "f")
verify(f.func_name == "f")
f.__name__ = "g"
verify(f.__name__ == "g")
verify(f.func_name == "g")
f.func_name = "h"
verify(f.__name__ == "h")
verify(f.func_name == "h")
cantset(f, "func_globals", 1)
cantset(f, "__name__", 1)
# test that you can access func.__name__ in restricted mode
s = """def f(): pass\nf.__name__"""
exec s in {'__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.func_code) is types.CodeType)
f.func_code = g.func_code
cantset(f, "func_code", None)
# can't change the number of free vars
cantset(f, "func_code", f1.func_code, exception=ValueError)
cantset(f1, "func_code", f.func_code, exception=ValueError)
cantset(f1, "func_code", f2.func_code, exception=ValueError)
f1.func_code = g1.func_code
def test_func_defaults():
def f(a, b): return (a, b)
verify(f.func_defaults is None)
f.func_defaults = (1, 2)
verify(f.func_defaults == (1, 2))
verify(f(10) == (10, 2))
def g(a=1, b=2): return (a, b)
verify(g.func_defaults == (1, 2))
del g.func_defaults
verify(g.func_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__
b = f.func_dict
verify(a == {})
verify(a is b)
f.hello = 'world'
verify(a == {'hello': 'world'})
verify(f.func_dict is a is f.__dict__)
f.func_dict = {}
verify(not hasattr(f, "hello"))
f.__dict__ = {'world': 'hello'}
verify(f.world == "hello")
verify(f.__dict__ is f.func_dict == {'world': 'hello'})
cantset(f, "func_dict", None)
cantset(f, "__dict__", None)
def test_im_class():
class C:
def foo(self): pass
verify(C.foo.im_class is C)
verify(C().foo.im_class is C)
cantset(C.foo, "im_class", C)
cantset(C().foo, "im_class", C)
def test_im_func():
def foo(self): pass
class C:
pass
C.foo = foo
verify(C.foo.im_func is foo)
verify(C().foo.im_func is foo)
cantset(C.foo, "im_func", foo)
cantset(C().foo, "im_func", foo)
def test_im_self():
class C:
def foo(self): pass
verify(C.foo.im_self is None)
c = C()
verify(c.foo.im_self is c)
cantset(C.foo, "im_self", None)
cantset(c.foo, "im_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_im_class()
test_im_func()
test_im_self()
test_im_dict()
test_im_doc()
test_im_name()
testmore()