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learn-python/singleton.py at master · sxiaoming2007/learn-python · GitHub
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# encoding:utf-8
# -*- Python单例模式示例 -*-
class
Singleton
(
object
):
def
__new__
(
cls
):
if
not
hasattr
(
cls
,
'instance'
):
cls
.
instance
=
super
(
Singleton
,
cls
).
__new__
(
cls
)
return
cls
.
instance
if
__name__
==
'__main__'
:
a
=
Singleton
()
b
=
Singleton
()
print
(
id
(
a
))
print
(
id
(
b
))
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