(Word Occurrences) Write a program word-occurrences. py that accepts filename (str) as command-line argument and words from standard input; and writes to standard output the word along with the indices (ie, locations where it appears in the file whose name is filename - writes "Word not found" if the word does not appear in the file. >_*/workspace/project 6 $ python3 word_occurrences. py data/Beatles. txt dead Center> dead -> (3297, 4118, 4145, 41971 parrot center> Word not found word occurrences. py from instream import InStream from symboltable import Symbol Table import stdio import sys # Entry point. def main (): # Accept filename (str) as command line argument. # Set in Stream to an input stream built from filename. # Set words to the list of strings read from instream # Set occurrences to a new symbol table object. for 1, word in enumerate (...) # For each word (having index 1) in words... # It word does not exist in occurrences, insert it with an empty list as the value. # Append i to the list corresponding to word in occurrences. while . #As long as standard input is not empty.. # Set word to a string read from standard input. # If word exists in occurrences, write the word and the corresponding list to standard Exercises word occurrences. py #output separated by the string Otherwise, write the message Word not found 1 else main()