python - Match common words in two files, and add info from one file to the other -

is there way find matches between first word in 2 files ([0]=[0], , add second word [1] 1 file other in common lines?

example:

file 1:

cow 3 lion 5 monkey 2 

file 2:

lion meat goat grass gorilla banana 

desired output:

lion 5 meat #common first word between files + second word file 2 in file 1 

any ideas?

you can use collections.defaultdict:

import collections open('file1') f1, open('file2') f2:     my_dict = collections.defaultdict(list)     x in f1:         x = x.strip().split()         my_dict[x[0]].append(x[1])     x in f2:         x = x.strip().split()         if x[0] in my_dict:             my_dict[x[0]].append(x[1]) 

my_dict like: {'lion': [5,'meat'], ....}