安装依赖环境yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel 下载py...

[delta _{{ij}}={begin{cases}0&{text{if }}ineq j,\1&{text{if }}i=j.end{cases}}]

题目：python3多线程import threadingimport timelist_ticket=[] #定义票池lock=threading.Lock() #获得多线程锁num=30#票数for i in range(1,num+1): #ticket_num="0"*(len(......

python2中的input：要求输入者必须输入一个明确的数据类型，输入什么类型就存成什么类型

字典的基本详情字典查找速度快字典是无序的；（python3.6以上版本有序）字典支持乘加、成员检查、长度、最小值、最大值、嵌套；字典值不支持列表、元组、索引、切片、元素赋值跟切片赋值；字典通过大括号表示；字典的内容是项；项...

https://www.cnblogs.com/dhcn/p/9032461.html

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代码：import ospath = r"C:UsersAdministratorDesktop***"print('filenum:',len([lists for lists in os.listdir(path) if os.path.isfile(os.path.join(path, list...

a=[1,2,3,4,5,6,7,8,9,10]#连加b=0for i in a:　　b+=iprint(b)#连乘c=1for i in a:　　c*=iprint(c)

import requestsfrom fake_useragent import UserAgentfrom lxml import etreefrom urllib.parse import urljoinimport pymysqlimport timeua = UserAgent()clas...