python模块

模块sys模块（和解释器相关的模块）

模块之导入模块：

        import sys

        sys.path.append("D:");

        for i in sys.path:

              print(i)

模块之os模块(和系统相关的模块)

import os
str1='D:'
str2='home'
str3='index'
t=os.path.join(str1,str2,str3)
print(t)

os.stat('path/filename')
os.path.dirname(path)
os.path.exists(path)
os.path.join(path1,path2,path3)

 很重要

ask.com

biying.com

stackoverflow.com

 安全的MD5加密

import hashlib

ha=hashlib.md5(bytes('123',encoding='utf-8'))

ha.update(bytes('123',encoding='utf-8'))
print(ha.hexdigest())


#下面是MD5实际应用登录的实例

import hashlib
def register(user,pwd):
    with open('haha','w',encoding='utf-8') as f:
        f.write(user+'|'+md5(pwd))
        f.close()
def login(name,pwd):
    with open('haha','r',encoding='utf-8') as f:
        for line in f:
            c,d=line.strip().split('|')
            if c==name and d==md5(pwd):
                return True
            else:
                return False
def md5(pwd):
    ha=hashlib.md5(bytes('guozhendong',encoding='utf-8'))
    ha.update(bytes(pwd,encoding='utf-8'))
    return ha.hexdigest()
i=input("1.登录；2.注册")
if i=='2':
    name=input('用户名：')
    pwd=input('密码：')
    register(name,pwd)
if i=='1':
    name = input('用户名：')
    pwd = input('密码：')
    t=login(name,pwd)
    if t==True:
        print("登录成功")
    else:
        print("登录失败")



#end