Python Question
Python: find all possible combinations between one array and N arrays
In Python, I am looking for a generic way (i.e. itertools) to build an
arrayHere is a simplified example.
Input
main = ["a1","a2","a3"]
secondary = [["b1","b2"],["c1","c2","c3"]]
Expected output
[
["a1","b1","c1"],
["a1","b1","c2"],
["a1","b1","c3"],
["a1","b2","c1"],
["a1","b2","c2"],
["a1","b2","c3"],
["a2","b1","c1"],
["a2","b1","c2"],
["a2","b1","c3"],
....
["a3","b2","c3"]
]
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Answer Source
You can do it with itertools.product() like so:
from itertools import product
main = ["a1","a2","a3"]
secondary = [["b1","b2"],["c1","c2","c3"]]
[list(a) for a in product(main, *secondary)]
Output:
[['a1', 'b1', 'c1'],
['a1', 'b1', 'c2'],
['a1', 'b1', 'c3'],
['a1', 'b2', 'c1'],
['a1', 'b2', 'c2'],
['a1', 'b2', 'c3'],
['a2', 'b1', 'c1'],
['a2', 'b1', 'c2'],
['a2', 'b1', 'c3'],
['a2', 'b2', 'c1'],
['a2', 'b2', 'c2'],
['a2', 'b2', 'c3'],
['a3', 'b1', 'c1'],
['a3', 'b1', 'c2'],
['a3', 'b1', 'c3'],
['a3', 'b2', 'c1'],
['a3', 'b2', 'c2'],
['a3', 'b2', 'c3']]
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