一、HelloWorld #！/usr/bin/env python
#-*- coding:utf-8 -*-
print("HelloWorld!")
二、用户交互
#!/usr/bin/env python#_*_coding:utf-8_*_name = input("What is your name?")
print("Hello " name )
输入密码时，如果想要不可见，需要利用getpass 模块中的 getpass方法，即：import getpass
# 将用户输入的内容赋值给 name 变量
pwd = getpass.getpass("请输入密码：")
# 打印输入的内容print(pwd)
#!/usr/bin/env python# -*- coding: utf-8 -*-username = input("username:")
password = getpass.getpass("password:")
print("username,password")
#在pycharm中会执行不了，但可在Linux环境下执行
三、字符串格式化输出
name = "emily"
print "i am %s " % name
#输出: i am emilyPS: 字符串是 %s;整数 %d;浮点数%f
四、表达式 if......else
#!/usr/bin/env python
# -*- coding: utf-8 -*-_password = 'abc123'
username = input("username:")
password = input("password:")
password = input("password:")
if _username == username and _password == password:
print("welcome user {name} login...")
else:
print("invalid username or password!")
五、while语句
a = 30
count = 0
while count <3:
b = int(input("a:"))
if a == b:
print("yes")
break
elif a>b:
print("small")
else:
print("big")
count +=1
else:
print ("you have tried too many times..fuck off")
六、for语句
for i in range(10):
print('------',i)
for j in range(10):
print(j)
if j>5:
break