def test_newslots(self):
# Testing __new__ slot override...
class C(list):
def __new__(cls):
self = list.__new__(cls)
self.foo = 1
return self
def __init__(self):
self.foo = self.foo + 2
a = C()
self.assertEqual(a.foo, 3)
self.assertEqual(a.__class__, C)
class D(C):
pass
b = D()
self.assertEqual(b.foo, 3)
self.assertEqual(b.__class__, D)
python类__new__()的实例源码
def test_funny_new(self):
# Testing __new__ returning something unexpected...
class C(object):
def __new__(cls, arg):
if isinstance(arg, str): return [1, 2, 3]
elif isinstance(arg, int): return object.__new__(D)
else: return object.__new__(cls)
class D(C):
def __init__(self, arg):
self.foo = arg
self.assertEqual(C("1"), [1, 2, 3])
self.assertEqual(D("1"), [1, 2, 3])
d = D(None)
self.assertEqual(d.foo, None)
d = C(1)
self.assertIsInstance(d, D)
self.assertEqual(d.foo, 1)
d = D(1)
self.assertIsInstance(d, D)
self.assertEqual(d.foo, 1)
def test_newslots(self):
# Testing __new__ slot override...
class C(list):
def __new__(cls):
self = list.__new__(cls)
self.foo = 1
return self
def __init__(self):
self.foo = self.foo + 2
a = C()
self.assertEqual(a.foo, 3)
self.assertEqual(a.__class__, C)
class D(C):
pass
b = D()
self.assertEqual(b.foo, 3)
self.assertEqual(b.__class__, D)
def test_recursions_1(self):
# Testing recursion checks ...
class Letter(str):
def __new__(cls, letter):
if letter == 'EPS':
return str.__new__(cls)
return str.__new__(cls, letter)
def __str__(self):
if not self:
return 'EPS'
return self
# sys.stdout needs to be the original to trigger the recursion bug
test_stdout = sys.stdout
sys.stdout = test_support.get_original_stdout()
try:
# nothing should actually be printed, this should raise an exception
print Letter('w')
except RuntimeError:
pass
else:
self.fail("expected a RuntimeError for print recursion")
finally:
sys.stdout = test_stdout
def test_newslots(self):
# Testing __new__ slot override...
class C(list):
def __new__(cls):
self = list.__new__(cls)
self.foo = 1
return self
def __init__(self):
self.foo = self.foo + 2
a = C()
self.assertEqual(a.foo, 3)
self.assertEqual(a.__class__, C)
class D(C):
pass
b = D()
self.assertEqual(b.foo, 3)
self.assertEqual(b.__class__, D)
def test_recursions_1(self):
# Testing recursion checks ...
class Letter(str):
def __new__(cls, letter):
if letter == 'EPS':
return str.__new__(cls)
return str.__new__(cls, letter)
def __str__(self):
if not self:
return 'EPS'
return self
# sys.stdout needs to be the original to trigger the recursion bug
test_stdout = sys.stdout
sys.stdout = test_support.get_original_stdout()
try:
# nothing should actually be printed, this should raise an exception
print Letter('w')
except RuntimeError:
pass
else:
self.fail("expected a RuntimeError for print recursion")
finally:
sys.stdout = test_stdout
def test_newslots(self):
# Testing __new__ slot override...
class C(list):
def __new__(cls):
self = list.__new__(cls)
self.foo = 1
return self
def __init__(self):
self.foo = self.foo + 2
a = C()
self.assertEqual(a.foo, 3)
self.assertEqual(a.__class__, C)
class D(C):
pass
b = D()
self.assertEqual(b.foo, 3)
self.assertEqual(b.__class__, D)
def test_funny_new(self):
# Testing __new__ returning something unexpected...
class C(object):
def __new__(cls, arg):
if isinstance(arg, str): return [1, 2, 3]
elif isinstance(arg, int): return object.__new__(D)
else: return object.__new__(cls)
class D(C):
def __init__(self, arg):
self.foo = arg
self.assertEqual(C("1"), [1, 2, 3])
self.assertEqual(D("1"), [1, 2, 3])
d = D(None)
self.assertEqual(d.foo, None)
d = C(1)
self.assertIsInstance(d, D)
self.assertEqual(d.foo, 1)
d = D(1)
self.assertIsInstance(d, D)
self.assertEqual(d.foo, 1)
def test_newslots(self):
# Testing __new__ slot override...
class C(list):
def __new__(cls):
self = list.__new__(cls)
self.foo = 1
return self
def __init__(self):
self.foo = self.foo + 2
a = C()
self.assertEqual(a.foo, 3)
self.assertEqual(a.__class__, C)
class D(C):
pass
b = D()
self.assertEqual(b.foo, 3)
self.assertEqual(b.__class__, D)
def test_recursions_1(self):
# Testing recursion checks ...
class Letter(str):
def __new__(cls, letter):
if letter == 'EPS':
return str.__new__(cls)
return str.__new__(cls, letter)
def __str__(self):
if not self:
return 'EPS'
return self
# sys.stdout needs to be the original to trigger the recursion bug
test_stdout = sys.stdout
sys.stdout = test_support.get_original_stdout()
try:
# nothing should actually be printed, this should raise an exception
print Letter('w')
except RuntimeError:
pass
else:
self.fail("expected a RuntimeError for print recursion")
finally:
sys.stdout = test_stdout
def test_newslots(self):
# Testing __new__ slot override...
class C(list):
def __new__(cls):
self = list.__new__(cls)
self.foo = 1
return self
def __init__(self):
self.foo = self.foo + 2
a = C()
self.assertEqual(a.foo, 3)
self.assertEqual(a.__class__, C)
class D(C):
pass
b = D()
self.assertEqual(b.foo, 3)
self.assertEqual(b.__class__, D)
def test_funny_new(self):
# Testing __new__ returning something unexpected...
class C(object):
def __new__(cls, arg):
if isinstance(arg, str): return [1, 2, 3]
elif isinstance(arg, int): return object.__new__(D)
else: return object.__new__(cls)
class D(C):
def __init__(self, arg):
self.foo = arg
self.assertEqual(C("1"), [1, 2, 3])
self.assertEqual(D("1"), [1, 2, 3])
d = D(None)
self.assertEqual(d.foo, None)
d = C(1)
self.assertIsInstance(d, D)
self.assertEqual(d.foo, 1)
d = D(1)
self.assertIsInstance(d, D)
self.assertEqual(d.foo, 1)
def test_newslots(self):
# Testing __new__ slot override...
class C(list):
def __new__(cls):
self = list.__new__(cls)
self.foo = 1
return self
def __init__(self):
self.foo = self.foo + 2
a = C()
self.assertEqual(a.foo, 3)
self.assertEqual(a.__class__, C)
class D(C):
pass
b = D()
self.assertEqual(b.foo, 3)
self.assertEqual(b.__class__, D)
def test_recursions_1(self):
# Testing recursion checks ...
class Letter(str):
def __new__(cls, letter):
if letter == 'EPS':
return str.__new__(cls)
return str.__new__(cls, letter)
def __str__(self):
if not self:
return 'EPS'
return self
# sys.stdout needs to be the original to trigger the recursion bug
test_stdout = sys.stdout
sys.stdout = test_support.get_original_stdout()
try:
# nothing should actually be printed, this should raise an exception
print Letter('w')
except RuntimeError:
pass
else:
self.fail("expected a RuntimeError for print recursion")
finally:
sys.stdout = test_stdout
def test_newslots(self):
# Testing __new__ slot override...
class C(list):
def __new__(cls):
self = list.__new__(cls)
self.foo = 1
return self
def __init__(self):
self.foo = self.foo + 2
a = C()
self.assertEqual(a.foo, 3)
self.assertEqual(a.__class__, C)
class D(C):
pass
b = D()
self.assertEqual(b.foo, 3)
self.assertEqual(b.__class__, D)
def test_funny_new(self):
# Testing __new__ returning something unexpected...
class C(object):
def __new__(cls, arg):
if isinstance(arg, str): return [1, 2, 3]
elif isinstance(arg, int): return object.__new__(D)
else: return object.__new__(cls)
class D(C):
def __init__(self, arg):
self.foo = arg
self.assertEqual(C("1"), [1, 2, 3])
self.assertEqual(D("1"), [1, 2, 3])
d = D(None)
self.assertEqual(d.foo, None)
d = C(1)
self.assertIsInstance(d, D)
self.assertEqual(d.foo, 1)
d = D(1)
self.assertIsInstance(d, D)
self.assertEqual(d.foo, 1)
def test_complexes(self):
# Testing complex operations...
self.number_operators(100.0j, 3.0j, skip=['lt', 'le', 'gt', 'ge',
'int', 'float',
'divmod', 'mod'])
class Number(complex):
__slots__ = ['prec']
def __new__(cls, *args, **kwds):
result = complex.__new__(cls, *args)
result.prec = kwds.get('prec', 12)
return result
def __repr__(self):
prec = self.prec
if self.imag == 0.0:
return "%.*g" % (prec, self.real)
if self.real == 0.0:
return "%.*gj" % (prec, self.imag)
return "(%.*g+%.*gj)" % (prec, self.real, prec, self.imag)
__str__ = __repr__
a = Number(3.14, prec=6)
self.assertEqual(repr(a), "3.14")
self.assertEqual(a.prec, 6)
a = Number(a, prec=2)
self.assertEqual(repr(a), "3.1")
self.assertEqual(a.prec, 2)
a = Number(234.5)
self.assertEqual(repr(a), "234.5")
self.assertEqual(a.prec, 12)
def test_unintialized_modules(self):
# Testing uninitialized module objects...
from types import ModuleType as M
m = M.__new__(M)
str(m)
self.assertEqual(hasattr(m, "__name__"), 0)
self.assertEqual(hasattr(m, "__file__"), 0)
self.assertEqual(hasattr(m, "foo"), 0)
self.assertFalse(m.__dict__) # None or {} are both reasonable answers
m.foo = 1
self.assertEqual(m.__dict__, {"foo": 1})
def test_complexes(self):
# Testing complex operations...
self.number_operators(100.0j, 3.0j, skip=['lt', 'le', 'gt', 'ge',
'int', 'long', 'float'])
class Number(complex):
__slots__ = ['prec']
def __new__(cls, *args, **kwds):
result = complex.__new__(cls, *args)
result.prec = kwds.get('prec', 12)
return result
def __repr__(self):
prec = self.prec
if self.imag == 0.0:
return "%.*g" % (prec, self.real)
if self.real == 0.0:
return "%.*gj" % (prec, self.imag)
return "(%.*g+%.*gj)" % (prec, self.real, prec, self.imag)
__str__ = __repr__
a = Number(3.14, prec=6)
self.assertEqual(repr(a), "3.14")
self.assertEqual(a.prec, 6)
a = Number(a, prec=2)
self.assertEqual(repr(a), "3.1")
self.assertEqual(a.prec, 2)
a = Number(234.5)
self.assertEqual(repr(a), "234.5")
self.assertEqual(a.prec, 12)
def test_uninitialized_modules(self):
# Testing uninitialized module objects...
from types import ModuleType as M
m = M.__new__(M)
str(m)
self.assertNotHasAttr(m, "__name__")
self.assertNotHasAttr(m, "__file__")
self.assertNotHasAttr(m, "foo")
self.assertFalse(m.__dict__) # None or {} are both reasonable answers
m.foo = 1
self.assertEqual(m.__dict__, {"foo": 1})
def test_complexes(self):
# Testing complex operations...
self.number_operators(100.0j, 3.0j, skip=['lt', 'le', 'gt', 'ge',
'int', 'long', 'float'])
class Number(complex):
__slots__ = ['prec']
def __new__(cls, *args, **kwds):
result = complex.__new__(cls, *args)
result.prec = kwds.get('prec', 12)
return result
def __repr__(self):
prec = self.prec
if self.imag == 0.0:
return "%.*g" % (prec, self.real)
if self.real == 0.0:
return "%.*gj" % (prec, self.imag)
return "(%.*g+%.*gj)" % (prec, self.real, prec, self.imag)
__str__ = __repr__
a = Number(3.14, prec=6)
self.assertEqual(repr(a), "3.14")
self.assertEqual(a.prec, 6)
a = Number(a, prec=2)
self.assertEqual(repr(a), "3.1")
self.assertEqual(a.prec, 2)
a = Number(234.5)
self.assertEqual(repr(a), "234.5")
self.assertEqual(a.prec, 12)
def test_uninitialized_modules(self):
# Testing uninitialized module objects...
from types import ModuleType as M
m = M.__new__(M)
str(m)
self.assertNotHasAttr(m, "__name__")
self.assertNotHasAttr(m, "__file__")
self.assertNotHasAttr(m, "foo")
self.assertFalse(m.__dict__) # None or {} are both reasonable answers
m.foo = 1
self.assertEqual(m.__dict__, {"foo": 1})
def test_complexes(self):
# Testing complex operations...
self.number_operators(100.0j, 3.0j, skip=['lt', 'le', 'gt', 'ge',
'int', 'float',
'divmod', 'mod'])
class Number(complex):
__slots__ = ['prec']
def __new__(cls, *args, **kwds):
result = complex.__new__(cls, *args)
result.prec = kwds.get('prec', 12)
return result
def __repr__(self):
prec = self.prec
if self.imag == 0.0:
return "%.*g" % (prec, self.real)
if self.real == 0.0:
return "%.*gj" % (prec, self.imag)
return "(%.*g+%.*gj)" % (prec, self.real, prec, self.imag)
__str__ = __repr__
a = Number(3.14, prec=6)
self.assertEqual(repr(a), "3.14")
self.assertEqual(a.prec, 6)
a = Number(a, prec=2)
self.assertEqual(repr(a), "3.1")
self.assertEqual(a.prec, 2)
a = Number(234.5)
self.assertEqual(repr(a), "234.5")
self.assertEqual(a.prec, 12)
def test_unintialized_modules(self):
# Testing uninitialized module objects...
from types import ModuleType as M
m = M.__new__(M)
str(m)
self.assertEqual(hasattr(m, "__name__"), 0)
self.assertEqual(hasattr(m, "__file__"), 0)
self.assertEqual(hasattr(m, "foo"), 0)
self.assertFalse(m.__dict__) # None or {} are both reasonable answers
m.foo = 1
self.assertEqual(m.__dict__, {"foo": 1})
def test_complexes(self):
# Testing complex operations...
self.number_operators(100.0j, 3.0j, skip=['lt', 'le', 'gt', 'ge',
'int', 'long', 'float'])
class Number(complex):
__slots__ = ['prec']
def __new__(cls, *args, **kwds):
result = complex.__new__(cls, *args)
result.prec = kwds.get('prec', 12)
return result
def __repr__(self):
prec = self.prec
if self.imag == 0.0:
return "%.*g" % (prec, self.real)
if self.real == 0.0:
return "%.*gj" % (prec, self.imag)
return "(%.*g+%.*gj)" % (prec, self.real, prec, self.imag)
__str__ = __repr__
a = Number(3.14, prec=6)
self.assertEqual(repr(a), "3.14")
self.assertEqual(a.prec, 6)
a = Number(a, prec=2)
self.assertEqual(repr(a), "3.1")
self.assertEqual(a.prec, 2)
a = Number(234.5)
self.assertEqual(repr(a), "234.5")
self.assertEqual(a.prec, 12)
def test_unintialized_modules(self):
# Testing uninitialized module objects...
from types import ModuleType as M
m = M.__new__(M)
str(m)
self.assertNotHasAttr(m, "__name__")
self.assertNotHasAttr(m, "__file__")
self.assertNotHasAttr(m, "foo")
self.assertFalse(m.__dict__) # None or {} are both reasonable answers
m.foo = 1
self.assertEqual(m.__dict__, {"foo": 1})
def test_complexes(self):
# Testing complex operations...
self.number_operators(100.0j, 3.0j, skip=['lt', 'le', 'gt', 'ge',
'int', 'float',
'floordiv', 'divmod', 'mod'])
class Number(complex):
__slots__ = ['prec']
def __new__(cls, *args, **kwds):
result = complex.__new__(cls, *args)
result.prec = kwds.get('prec', 12)
return result
def __repr__(self):
prec = self.prec
if self.imag == 0.0:
return "%.*g" % (prec, self.real)
if self.real == 0.0:
return "%.*gj" % (prec, self.imag)
return "(%.*g+%.*gj)" % (prec, self.real, prec, self.imag)
__str__ = __repr__
a = Number(3.14, prec=6)
self.assertEqual(repr(a), "3.14")
self.assertEqual(a.prec, 6)
a = Number(a, prec=2)
self.assertEqual(repr(a), "3.1")
self.assertEqual(a.prec, 2)
a = Number(234.5)
self.assertEqual(repr(a), "234.5")
self.assertEqual(a.prec, 12)
def test_unintialized_modules(self):
# Testing uninitialized module objects...
from types import ModuleType as M
m = M.__new__(M)
str(m)
self.assertNotHasAttr(m, "__name__")
self.assertNotHasAttr(m, "__file__")
self.assertNotHasAttr(m, "foo")
self.assertFalse(m.__dict__) # None or {} are both reasonable answers
m.foo = 1
self.assertEqual(m.__dict__, {"foo": 1})
def __new__(mcls, name, bases, attrs):
if attrs.get('__doc__') is None:
attrs['__doc__'] = name # helps when debugging with gdb
return type.__new__(mcls, name, bases, attrs)
def test_complexes(self):
# Testing complex operations...
self.number_operators(100.0j, 3.0j, skip=['lt', 'le', 'gt', 'ge',
'int', 'long', 'float'])
class Number(complex):
__slots__ = ['prec']
def __new__(cls, *args, **kwds):
result = complex.__new__(cls, *args)
result.prec = kwds.get('prec', 12)
return result
def __repr__(self):
prec = self.prec
if self.imag == 0.0:
return "%.*g" % (prec, self.real)
if self.real == 0.0:
return "%.*gj" % (prec, self.imag)
return "(%.*g+%.*gj)" % (prec, self.real, prec, self.imag)
__str__ = __repr__
a = Number(3.14, prec=6)
self.assertEqual(repr(a), "3.14")
self.assertEqual(a.prec, 6)
a = Number(a, prec=2)
self.assertEqual(repr(a), "3.1")
self.assertEqual(a.prec, 2)
a = Number(234.5)
self.assertEqual(repr(a), "234.5")
self.assertEqual(a.prec, 12)
