I am trying to combine 2 lists and want to form combinations.
a = ['ibm','dell']
b = ['strength','weekness']
I want to form combinations like ['ibm strength','ibm weekness','dell strength','dell weakness'].
I tried to use zip or concatenated the lists. I also used itertools but it doesn't give me desired output. Please help.
a = ['ibm','dell']
b = ['strength','weekness']
c = a + b
itertools.combinations(c,2)
for a in a:
for b in b:
print a +b
You're looking for product(). Try this:
import itertools
a = ['ibm', 'dell']
b = ['strength', 'weakness']
[' '.join(x) for x in itertools.product(a, b)]
=> ['ibm strength', 'ibm weakness', 'dell strength', 'dell weakness']
To loop over the results don't forget that itertools.product() returns an iterator that can be consumed only once. If you need it at a later time, convert it into a list (as I did above, using a list comprehension) and store the result in a variable, for future use. For example:
lst = list(itertools.product(a, b))
for a, b in lst:
print a, b
itertools return iterators (not lists), that can be traversed only once. If you need to use them at a later point convert them to lists. And you must save the result in a variable, simply calling the function won't do anythingFor a Cartesian product, you want itertools.product() instead of combinations.
A nested for-loop would also work:
for x in a:
for y in b:
c = a + b
print(c)
