[英]Iterate through two lists of different lengths
I have the following two lists: 我有以下两个清单:
nums = [1, 2, 3, 4, 5, 6, 7, 8]
ltrs = ['a', 'b', 'c', 'd']
for x, y in nums, ltrs:
print(x, y)
With the following error 出现以下错误
c:\Python35\Scripts>python listtest.py
Traceback (most recent call last):
File "listtest.py", line 5, in <module>
for x, y in nums, ltrs:
ValueError: too many values to unpack (expected 2)
I would like for the output to be: 我希望输出为:
1a, 2b, 3c, 4d, 5, 6, 7, 8
1a,2b,3c,4d,5,6,7,8
From what I have read the zip
method will only work if the two lists are the same length, what are my options with lists of different lengths? 从我所看到的,
zip
方法只有在两个列表长度相同的情况下才能工作,我的选项有不同长度的列表吗?
izip_longest
is similar to zip
, but allows you to add a default value ( fillvalue
) to use when the shorter list is exhausted. izip_longest
与zip
类似,但允许您添加默认值( fillvalue
)以在较短列表用尽时使用。 From there on, it's just some simple manipulations: 从那以后,它只是一些简单的操作:
[''.join([str(c) for c in x]) for x in izip_longest(nums, ltrs, fillvalue='')]
You can use itertools.zip_longest
for Python3: 你可以使用
itertools.zip_longest
for Python3:
import itertools
nums = [1, 2, 3, 4, 5, 6, 7, 8]
ltrs = ['a', 'b', 'c', 'd']
final_list = [''.join([str(c) if isinstance(c, int) else c for c in [i for i in b if i is not None]]) for b in itertools.zip_longest(nums, ltrs)]
Output: 输出:
['1a', '2b', '3c', '4d', '5', '6', '7', '8']
import itertools
for x, y in list(itertools.zip_longest(nums,ltrs)):
print(x, y)
Output 产量
1 a
2 b
3 c
4 d
5 None
6 None
7 None
8 None
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