Python script for discovering who unfollowed you on Instagram (and unfollowing those people).

Followers.py

#!/usr/bin/env python2.7

"""Discovers who unfollowed you on Instagram (and unfollows those people)."""

import json
from webbrowser import open_new_tab
from urllib2 import urlopen, URLError
from urlparse import urlparse
from time import time
from os import rename

__author__ = 'Palmer Paul'
__version__ = "1.0.0-alpha"
__email__ = "[email protected]"

class Application(object):
    def __init__(self):
        self.client_id = "fa6cf0f95ce4430f90b6ec52b89786c4"
        self.rURI = "http://localhost:8515/"
        self.scope = ["relationships"]
        
        self.data = self.load_data()
        self.followers = []

    def load_data(self):
        try:
            fp_read = open("data.txt", "r")
            try:
                data = json.load(fp_read)
                fp_read.close()
            except ValueError:
                fp_read.close()
                data = self.load_error()
        except IOError:
            data = self.load_error()
        return data

    def load_error(self):
        token = self.authenticate()
        data = (token, {time(): self.update(token)})
        write = open("temp.txt", "w")
        json.dump(data, write)
        write.close()
        rename("temp.txt", "data.txt")
        return data
        
    def authenticate(self):
        if len(self.scope) == 0:
            self.scope.append("basic")
        open_new_tab("https://instagram.com/oauth/authorize/?client_id=" + self.client_id + "&redirect_uri=" + self.rURI + "&scope=" + "+".join(self.scope) + "&response_type=token")
        url = raw_input("After authorizing this app, copy the entire URL from the address bar and paste it here (it doesn't matter if the page cannot be found): ")
        while not "http://localhost:8515/#" in url:
            url = raw_input("Please copy and paste the ENTIRE URL: ")
        url = urlparse(url)[5]
        token = url[url.find("access_token=")+13:]
        return token

    def update(self, token): 
        next_url = "https://api.instagram.com/v1/users/3/followed-by?access_token=" + token
        while True:
            try:
                request = json.loads(urlopen(next_url).read())
            except URLError:
                print "Error: Could not access the Instagram API"
                raise SystemExit

            for user in range(len(request["data"])):
                self.followers.append(request["data"][user]["username"])

            try:
                next_url = request["pagination"]["next_url"]
            except KeyError:
                break

            print len(self.followers)
        self.save()
        return self.followers
        
    def save(self):
        self.data[1][time()] = self.followers
        write = open("temp.txt", "w")
        json.dump(self.data, write)
        write.close()
        rename("temp.txt", "data.txt")
        
    def compare(self):        
        follow_hist = self.data[1]
        last = follow_hist[max(follow_hist.keys())]
        current = self.update(self.data[0])

        lost = []
        for follower in range(len(last)):
            if not last[follower] in current:
                lost.append(last[follower])

        gained = []
        for follower in range(len(current)):
            if not current[follower] in last:
                gained.append(current[follower])

        return lost, gained

    def main(self):
        pass

myApp = Application()
print myApp.compare()