从列表中删除无值,而不删除0值 [英] remove None value from a list without removing the 0 value

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本文介绍了从列表中删除无值,而不删除0值的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

这是我开始使用的源码



我的清单

  L = [0,23,234,89,无, 0,35,9] 

当我运行这个:

  L =过滤器(无,L)

我得到这个结果

  [23,234,89,35,9] 

但是这不是我所需要的,我真正需要的是:
$ b $

  [0,23,234,89,0,35,9] 

因为我正在计算数据的百分位数,0会产生很大的差别。

如何从列表中删除None值而不删除0值? p>

解决方案

 >>> L = [0,23,234,89,无,0,35,9] 
>>> [x for x in L如果x不是None]
[0,23,234,89,0,35,9]

只是为了好玩,下面是如何使用 filter 来做到这一点,而不使用 lambda $ b

 >>> $ c>,(我不会推荐这个代码 - 它只是为了科学目的) from operator import is_not 
>>> from functools import partial
>>> L = [0,23,234,89,无,0,35,9]
>>>过滤器(部分(is_not,无),L)
[0,23,234,89,0,35,9]


This was my source I started with.

My List

L = [0, 23, 234, 89, None, 0, 35, 9]

When I run this :

L = filter(None, L)

I get this results

[23, 234, 89, 35, 9]

But this is not what I need, what I really need is :

[0, 23, 234, 89, 0, 35, 9]

Because I'm calculating percentile of the data and the 0 make a lot of difference.

How to remove the None value from a list without removing 0 value?

解决方案

>>> L = [0, 23, 234, 89, None, 0, 35, 9]
>>> [x for x in L if x is not None]
[0, 23, 234, 89, 0, 35, 9]

Just for fun, here's how you can adapt filter to do this without using a lambda, (I wouldn't recommend this code - it's just for scientific purposes)

>>> from operator import is_not
>>> from functools import partial
>>> L = [0, 23, 234, 89, None, 0, 35, 9]
>>> filter(partial(is_not, None), L)
[0, 23, 234, 89, 0, 35, 9]

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