带有重复值和后缀的列表 [英] List with duplicated values and suffix

问题描述

我有一个列表，a:

a = ['a','b','c']

，并且需要使用添加的后缀_ind重复某些值(顺序很重要):

and need to duplicate some values with the suffix _ind added this way (order is important):

['a', 'a_ind', 'b', 'b_ind', 'c', 'c_ind']

我尝试过:

b = [[x, x + '_ind'] for x in a]
c = [item for sublist in b for item in sublist]
print (c)
['a', 'a_ind', 'b', 'b_ind', 'c', 'c_ind']

是否有一些更好的，更多的pythonic解决方案?

Is there some better, more pythonic solution?

推荐答案

您可以使其成为生成器:

You could make it a generator:

def mygen(lst):
    for item in lst:
        yield item
        yield item + '_ind'

>>> a = ['a','b','c']
>>> list(mygen(a))
['a', 'a_ind', 'b', 'b_ind', 'c', 'c_ind']

您也可以使用itertools.product，itertools.starmap或itertools.chain或嵌套的理解来做到这一点，但在大多数情况下，我希望使用一种易于理解的自定义生成器函数.

You could also do it with itertools.product, itertools.starmap or itertools.chain or nested comprehensions but in most cases I would prefer a simple to understand, custom generator-function.

使用python3.3，您还可以使用yield from(生成器委派)使这种优雅的解决方案更加简洁:

With python3.3, you can also use yield from—generator delegation—to make this elegant solution just a bit more concise:

def mygen(lst):
    for item in lst:
        yield from (item, item + '_ind')

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