Python 有权重的随机选择， Weighted Random Choice
import random def windex(lst):
'''an attempt to make a random.choose() function that makes weighted choices
accepts a list of tuples with the item and probability as a pair'''
wtotal = sum([x[1] for x in lst])
n = random.uniform(0, wtotal)
for item, weight in lst:
if n < weight:
break
n = n - weight
return item
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def Start(self):
if (self.conn == None) or (self.conn.State == 1):
self.conn = win32com.client.Dispatch(r'ADODB.Connection')
&n ......
真是倒霉，刚买不久的移动硬盘，昨天删除一个分区失败后，几个分区都不见了，拿去修，未果
换了个新的，但其中数据全没了。那是我平时收集的很有用的资料
很多都可以重新下载，但怎能想起硬盘中的所有东西
今天换硬盘回来
就像写一个保存指定路径下所有文件夹和文件名的程序
这样，如果东西丢了，看看那里有些什么，也 ......
8.8. queue — A synchronized queue class¶
queue -- 一个同步队列类
The queue module implements multi-producer, multi-consumer queues. It is especially useful in threaded programming when information must be exchanged safely between multiple threads. The Queue class in this module implemen ......
threading — Higher-level threading interface
This module constructs higher-level threading interfaces on top of the lower level _thread module. See also the queue module.
The dummy_threading module is provided for situations where threading cannot be used because _thread is missing.
......
1.常用方法，不带参数
def decator(func):
def inner_func(*args):
args = (i * 2 for i in args)
return func(*args)
return inner_func
@decator
def add(a, ......
