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what‘s wrong

时间:2016-06-12 23:13:16      阅读:131      评论:0      收藏:0      [点我收藏+]

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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]
>>> 

 

what‘s wrong

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原文地址:http://www.cnblogs.com/winditsway/p/5579060.html

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