[英]Python Insert a list into a list
我有一個這樣的清單:
a = ["a","b","c","d","e"]
如何在列表中每個項目的末尾插入一個單詞並使它們成為列表本身?
預期產量:
a = [("a","TEST"),("b","TEST"),("c","TEST"),("d","TEST"),("e","TEST")]
我嘗試了很多方法,但是沒有運氣。
用項目和所需的單詞創建一個元組:
word = "TEST"
a = ["a","b","c","d","e"]
new_a = [(i, word) for i in a]
輸出:
[('a', 'TEST'), ('b', 'TEST'), ('c', 'TEST'), ('d', 'TEST'), ('e', 'TEST')]
或者,使用map
:
new_a = list(map(lambda x: (x, "TEST"), a))
另一種方法是使用來自itertools
模塊的zip_longest
,如下所示(但解決方案應該是Ajax1234的在列表理解中使用元組的解決方案):
from itertools import zip_longest
l = ['a', 'b', 'c', 'd', 'e']
res = list(zip_longest(l, ['TEST'], fillvalue='TEST'))
輸出:
>>> res
[('a', 'TEST'), ('b', 'TEST'), ('c', 'TEST'), ('d', 'TEST'), ('e', 'TEST')]
您可以使用zip
:
a = ["a","b","c","d","e"]
new_a = zip(a, ["TEST"] * len(a))
輸出:
[('a', 'TEST'), ('b', 'TEST'), ('c', 'TEST'), ('d', 'TEST'), ('e', 'TEST')]
不太時髦,但與其他常見語言類似:
a = ["a","b","c","d","e"]
b = []
for x in a:
b.append ( (x, 'TEST'))
a = b
print a
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