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  • Phython 3 笔记2 —— 基础语法

    条件语句:

    if a == 1 :
      print("a = 1")
    elif a == 2 :
      print("a = 2")
    elif a == 3 :
      print("a = 3")
    else :
      print(a)

    get函数

    ## 寻找某个key值,如果有则返回value,否则返回第二个参数,即“NO”
    menu = {a:1, b:2, c:3}
    print(menu.get(a, 'NO'))

    循环语句:

    ##打印0-9的数字
    for i in range(10) :
      print(i)
    
    ##列表展开
    a = [1, 2, 3]
    for i in a :
      print(i)
    
    ##打印字典的key
    menu = {a:1, b:2, c:3}
    for i in menu :
      print(i)
    
    ##打印字典的value
    for i in menu.values() :
      print(i)
    
    ##同时打印key和value
    for i,j in menu.items() :
      print(i,j)
    
    ##while循环
    n = 0
    while n < 10 :
      print(n)
      n += 1
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  • 原文地址:https://www.cnblogs.com/frankscode/p/8496427.html
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