求《Python黑魔法指南2.0》全文免费下载百度网盘资源,谢谢~

发布网友 发布时间：2022-05-02 02:56

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共2个回答

懂视网 时间：2022-05-11 01:19

Python代码

#!/usr/bin/env python 
# -*- coding:utf-8 -*- 
 
def enum(**enums): 
 return type('Enum', (), enums) 
Gender = enum(MALE=0,FEMALE=1) 
print Gender.MALE 
print Gender.FEMALE

2、检查字符串是否是number

Python代码

s='123456789' 
s.isdigit()#return True

3、list取交集

Python代码

s=[1,2,3] 
w=[2,3,4] 
list(set(s).intersection(w))

4、两个list转成一个dict

Python代码

dict(zip(a,b))

5、singleton

Python代码

def singleton(cls): 
 instances = {} 
 def get_instance(): 
 if cls not in instances: 
  instances[cls] = cls() 
 return instances[cls] 
 return get_instance

第二种tornado IOLoop中使用的单例模式：

Python代码

@staticmethod 
def instance(): 
 """Returns a global IOLoop instance. 
 
 Most single-threaded applications have a single, global IOLoop. 
 Use this method instead of passing around IOLoop instances 
 throughout your code. 
 
 A common pattern for classes that depend on IOLoops is to use 
 a default argument to enable programs with multiple IOLoops 
 but not require the argument for simpler applications:: 
 
 class MyClass(object): 
  def __init__(self, io_loop=None): 
  self.io_loop = io_loop or IOLoop.instance() 
 """ 
 if not hasattr(IOLoop, "_instance"): 
 with IOLoop._instance_lock: 
  if not hasattr(IOLoop, "_instance"): 
  # New instance after double check 
  IOLoop._instance = IOLoop() 
 return IOLoop._instance

6、list排重

Python代码

{}.fromkeys(list).keys()

热心网友 时间：2022-05-10 22:27

《Python黑魔法指南2.0》百度网盘pdf最新全集下载:
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