[英]Python Itertools permutations with strings
i want to use itertools permutations for strings instead of just letters. 我想对字符串使用itertools排列,而不仅仅是字母。
import itertools
lst = list(permutations(("red","blue"),3))
#This returns []
I know i can do something like: 我知道我可以做类似的事情:
a = list(permutations(range(3),3))
for i in range(len(a)):
a[i] = list(map(lambda x: 'red' if x==0 else 'blue' if x==1 else 'green',a[i]))
EDIT: I want to key in this as my input, and get this as my output 编辑:我要键入此作为我的输入,并将其作为我的输出
input: ("red","red","blue")
output:
[(’red’, ’red’, ’red’), (’red’, ’red’, ’blue’),\
(’red’, ’blue’, ’red’), (’red’, ’blue’, ’blue’), (’blue’, ’red’, ’red’), \
(’blue’, ’red’, ’blue’), (’blue’, ’blue’, ’red’), (’blue’, ’blue’, ’blue’)]
You can try with itertools.product
like this: 您可以像这样尝试
itertools.product
:
import itertools
lst = list(set(itertools.product(("red","red","blue"),repeat=3))) # use set to drop duplicates
lst
lst
will be: lst
是:
[('red', 'blue', 'red'),
('blue', 'red', 'red'),
('blue', 'blue', 'red'),
('blue', 'blue', 'blue'),
('blue', 'red', 'blue'),
('red', 'blue', 'blue'),
('red', 'red', 'blue'),
('red', 'red', 'red')]
Update: 更新:
import itertools
lst = list(itertools.product(("red","blue"),repeat=3))
lst
output: 输出:
[('red', 'red', 'red'),
('red', 'red', 'blue'),
('red', 'blue', 'red'),
('red', 'blue', 'blue'),
('blue', 'red', 'red'),
('blue', 'red', 'blue'),
('blue', 'blue', 'red'),
('blue', 'blue', 'blue')]
You can do it, also, with combinations
from itertools
module, like this example: 您也可以使用
itertools
模块的combinations
来完成此操作,例如以下示例:
from itertools import combinations
final = list(set(combinations(("red","red","blue")*3, 3)))
print(final)
Output: 输出:
[('red', 'blue', 'red'),
('blue', 'red', 'red'),
('blue', 'blue', 'red'),
('blue', 'blue', 'blue'),
('blue', 'red', 'blue'),
('red', 'blue', 'blue'),
('red', 'red', 'blue'),
('red', 'red', 'red')]
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