0

I need to concatenate 2 different lists of strings in python.

for example:

list1 = ['A','B','C']
list2 = ['D', 'E']

I want to obtain

list3 = ['AD', 'AE', 'BD', 'BE', 'CD', 'CE']

I've tried:

list3 = zip(list1,list2)

And it returns

list3 = [('A','D'), ('B','E')]

I've also tried:

list(itertools.product(list1, list2))

But it returns

[('A','D'),('A','E'),...,('C','E')] and not ['AD', 'AE', 'BD', 'BE', 'CD', 'CE']

Any idea? THX

Georgy
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Joako
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3 Answers3

5

This should help:

import itertools

list1 = ['A','B','C']
list2 = ['D', 'E']
list(map("".join, itertools.product(list1, list2)))
# ['AD', 'AE', 'BD', 'BE', 'CD', 'CE']

Also, can be solved with a list comprehension.

["".join(i) for i in itertools.product(list1, list2)]
Georgy
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Ahsanul Haque
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1

You could use itertools.product to get the Cartesian product or employ 2 loops 

>>> list1 = ['A','B','C']
>>> list2 = ['D', 'E']
>>> import itertools
>>> list(itertools.product(list1, list2))
[('A', 'D'), ('A', 'E'), ('B', 'D'), ('B', 'E'), ('C', 'D'), ('C', 'E')]
>>> [(i, j) for i in list1 for j in list2]
[('A', 'D'), ('A', 'E'), ('B', 'D'), ('B', 'E'), ('C', 'D'), ('C', 'E')]
riteshtch
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0

How about two for loops?

pseudocode below

for item in list1:
    for item2 in list2:
         item = item + item2
dahui
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