所学模块：

import os

import sys

import getpass

os.system("df -h")

cmd_res = os.system("df -h")

print(cmd_res) 为0，因为结果为0，如果想看结果，请使用如下写法:

cmd_res = os.popen("df -h").read()

os.mkdir("directory")创建目录

print(sys.path)

查看python导入模块的路径

一般/usr/lib/python2.7/site-packages

可以import模块，import模块时，不加后缀py

if else用法

user = jack

passwd = 123456

username = input("username:")

password = input("password:")

if user == username:

    print("username is correct.")

if passwd == password:

    print("welcome log in.")

    else:

    print("password is invailid.")

优化：

user = jack

passwd = 123456

username = input("username:")

password = input("password:")

if user == username and passwd == password:

    print("welcome login.")

else:

    print("username or password is invailid.")

guess age:

age = 22

guess_num = int(input("guess your number"))

if guess_num = age:

    print("configratulations,you got it")

elif guess_num > age:

    print("thins smaller")

else:

    print("think bigger")

Python学习记录-2016-11-28