Python TypeError: 'list' object is not callable -

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# -*- coding:utf-8 -*- import codecs import numpy np import csv import pandas pd* nons_file=pd.read_csv(r'c:\users\roy\desktop\bighomework\new\non_subscibe\session.csv') s_file=pd.read_csv(r'c:\users\roy\desktop\bighomework\new\subscribe\session1.csv') s_file['subscribe'] = 1 nons_file['subscribe'] = 0 file=s_file.append(nons_file, ignore_index=false, verify_integrity=false)  id_dict={} count=0 in range(len(file.index)):     if file[i].id not in id_dict:         count+=1         file[i].id         id_dict[id]=count     else: file[i].id=id_dict[id] id_dict={} count=0 
typeerror traceback (most recent call last) “for in range(len(file.index)):”  typeerror: 'list' object not callable


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