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Interface to the external display is limited:
When publishing python third-party package, do not want to code all of the function or class may be external import, add __all__ property in __init__.py in the list, fill in the class or function name can import, you can play import restriction effect of preventing external import functions or other classes.
#!/usr/bin/envpython
#-*-coding:utf-8-*-
from base import APIBase
from client import Client
from decorator import interface,export,stream
from server import Server
from storage import Storage
from util import(LogFormatter,disable_logging_to_stderr,
enable_logging_to_kids,info)
__all__=['APIBase','Client','LogFormatter','Server',
'Storage','disable_logging_to_stderr','enable_logging_to_kids',
'export','info','interface','stream']filter usage:
Relative filter, it will be more frequent map and reduce the use of some, as the name filter, to filter out some of the elements according to certain rules.
#!/usr/bin/envpython
#-*-coding:utf-8-*-
lst=[1,2,3,4,5,6]
#所有奇数都会返回True,偶数会返回False被过滤掉
print filter(lambdax:x%2!=0,lst)
#输出结果
[1,3,5]
一行作判断：
当条件满足时，返回的为等号后面的变量，否则返回else后语句。
lst=[1,2,3]
new_lst=lst[0]iflstisnotNoneelseNone
print new_lst
#打印结果
1
装饰器之单例：
使用装饰器实现简单的单例模式
#单例装饰器
def singleton(cls):
instances=dict()#初始为空
def_singleton(*args,**kwargs):
if clsnotininstances:#如果不存在,则创建并放入字典
instances[cls]=cls(*args,**kwargs)
returninstances[cls]
return_singleton
@singleton
classTest(object):
pass
if__name__=='__main__':
t1=Test()
t2=Test()
#两者具有相同的地址
printt1,t2These are the small apes circle python lecturers to share the Python development skills, I hope you can look after master this skill, simple and efficient learning python, want to learn more little friends can go to a small circle to learn more ape skills, want to learn Python friends on it.