Intro to manipulating text in Python. Find people who don't follow you back on Instagram.

instagram_friends.py

import re

def cleanList(text):
    returns = []
    patterns= ['[A-Z]+']
    for line in text:
        line = line.strip()
        if " " not in line:
            match = None
            for p in patterns:
                match = re.findall(p, line)
            if (len(match) == 0):
                returns.append(line)
    return returns

file = open("followers.txt", "r") 
followers = file.readlines()
file.close()

file = open("following.txt", "r") 
following = file.readlines()
file.close()

followers_cleaned = cleanList(followers)
following_cleaned = cleanList(following)
non_mutuals = []
mutuals = []

for line in following_cleaned:
    followsYou = False
    for line2 in followers_cleaned:
        if line == line2:
            followsYou = True
    if (followsYou == False):
        non_mutuals.append(line)
    else:
        mutuals.append(line)

if len(following_cleaned) == len(mutuals) + len(non_mutuals):
    finalCheck = True
    checkErrorCount = 0

    for line in non_mutuals:
        for line2 in followers:
            if line == line2:
                finalCheck = False
                checkErrorCount += 1

    if (finalCheck == True):
        file = open("non_mutuals.txt", "w")
        for line in non_mutuals:
            print(line)
            file.write(line + "\r\n")
        file.close()

        print("Found " + str(len(followers_cleaned)) + " followers and " + str(len(following_cleaned)) + " following.")
        print("You are following " + str(len(mutuals)) + " mutuals and " + str(len(non_mutuals)) + " non-mutuals.")
    else:
        print("Error: " + str(checkErrorCount) + " non-mutuals were found in followers.")
else:
    print("Error: non-mutual and mutual counts don't add up.")