Python：将单个元素与列表中的每个元素配对

Question

例如： myStr = 'z'将与myList = ['a','b','c']配对，以便输出如下：

['z','a']
['z','b']
['z','c']

单线会很棒！

我试着这样做：

print zip([myStr, x] for x in myList)

但输出并不像我想的那样，就像在这里：

[(['z', 'a'],), (['z', 'b'],), (['z', 'c'],)]

Answer 1

试试这个：

myList = ['a','b','c']
myStr = 'z'
res = [[myStr, x] for x in myList]

Answer 2

使用zip：

>>> zip(myStr*3,myList)
[('z', 'a'), ('z', 'b'), ('z', 'c')]

Answer 3

Itertools - izip-longest

>>>from itertools import izip_longest
>>>[list(i) for i  in list(izip_longest(['z'],['a','b','c'],fillvalue ='z'))]
>>>[['z', 'a'], ['z', 'b'], ['z', 'c']]

Answer 4

from itertools import izip_longest
list(izip_longest([], ['a','b','c'], fillvalue='z'))