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  • what‘s wrong

    现在我看不出来我的问题在哪里!

    原题是要返回传入list or tuple的奇数位的元素,但是我用下面的方式会报错,在append那里目前,当下闭门造车,实在没有看到问题在哪里

    tup = [11,12,13,14,15,16,17,18,19]
    lis = []
    for i in range(0,len(tup),2):
        print tup[i]
        lis1 = lis.append(tup[i])
    print lis1

    执行结果:

    Python 2.7.11 (v2.7.11:6d1b6a68f775, Dec  5 2015, 20:40:30) [MSC v.1500 64 bit (AMD64)] on win32
    Type "copyright", "credits" or "license()" for more information.
    >>> 
    ======================= RESTART: C:/Python27/error.py =======================
    11
    13
    15
    17
    19
    None
    >>> 

    没有试过Python3

    但是在Linux下面直接运行也是一样的错误;

    但是感觉逻辑没有问题,或者说至少暂时我没有看到问题

    tup = [11,12,13,14,15,16,17,18,19]
    lis = []
    for i in range(0,len(tup),2):
        a = tup[i]
        print lis
        print type(a)
        print a
        lis1 = lis.append(a)
        print lis1
        print lis

    酱紫后lis 是我想要的,但是为啥lis1却是None呢?

    Python 2.7.11 (v2.7.11:6d1b6a68f775, Dec  5 2015, 20:40:30) [MSC v.1500 64 bit (AMD64)] on win32
    Type "copyright", "credits" or "license()" for more information.
    >>> 
    ======================= RESTART: C:/Python27/error.py =======================
    []
    <type 'int'>
    11
    None
    [11]
    [11]
    <type 'int'>
    13
    None
    [11, 13]
    [11, 13]
    <type 'int'>
    15
    None
    [11, 13, 15]
    [11, 13, 15]
    <type 'int'>
    17
    None
    [11, 13, 15, 17]
    [11, 13, 15, 17]
    <type 'int'>
    19
    None
    [11, 13, 15, 17, 19]
    >>> 
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  • 原文地址:https://www.cnblogs.com/winditsway/p/5579060.html
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