python学习笔记第一节，,一、HelloWor
python学习笔记第一节，,一、HelloWor
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：importgetpass
# 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 -*-_username = ‘emily‘_password = ‘abc123‘username = input("username:")
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
python学习笔记第一节
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