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  • 2018.09.28python学习第十三天part3


    # part3
    # 三元表达式

    # # eg.1
    # def max2(x,y):
    # if x>y:
    # print(x)
    # print(y)
    # max2(22,33)
    #
    # # 简化成三元表达式:
    # x=22
    # y=33
    # print(x if x>y else y)#使原代码更加的简洁

    # list生成式:
    # eg.1
    # old:
    l=[]
    for i in range(1,6):
    l.append(i)
    print(l)

    # new:
    l=[i for i in range(1,6)]###一行代码就实现了
    print(l)

    # eg.2

    # old:
    names=['egon','axle','tony']
    l=[]
    for name in names:
    if name!='tony':
    res='%s_sb'%name
    l.append(res)
    print(l)

    # new:
    l=['%s_sb'%name for name in names if name!='tony']
    print(l)

    # dict生成式:

    # eg.1

    #old
    items=[('name','egon'),('age',18),('sex','male')]
    d={}
    for k,v in items:
    d[k]=v
    print(d)

    #new
    d={k:v for k,v in items}
    print(d)

    # 生成器表达式
    res=(i**2 for i in range(3))
    print(res)
    print(next(res))
    print(next(res))
    print(next(res))
    print(next(res))
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  • 原文地址:https://www.cnblogs.com/hello-yuanjing/p/9721373.html
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