Open 3 files in python, add certain columns from each file to dictionaries, combine those dictionaries and filter them against one main file

curiouscoder 0
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How can I open three different files in python, add certain columns from each file to dictionaries, combine those dictionaries and filter them against one main file?

I was trying to open the file, print the columns I need and then put them into a dictionary. I'm not sure how the syntax works exactly.

with open("CSB/python/data/part1.txt", "r")as f:
    for row in reader:
        print(row["col1"], ["col4"])

Also, how would I merge those dictionaries and filter it against a master file?

dictionary python
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