Write Python code for this problem.

$($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$$ if the word does not appear in the file. Use this discussion $-$ Accept filename $($str$)$ as command$-$line argument$-$ Set inStream to an InputStream built from filename$-$ Set words to the list of strings read from inStream$-$ Set occurrences to a SymbolTable object$-$ For each word $($having index i$)$ in words$-$ If word does not exist in occurrences, insert it with an empty list as the value$-$ Append i to the list corresponding to word in occurrences$-$ As long as standard input is not empty$-$ Set word to a string read from standard input$-$ If word exists in occurrences, write the word and the corresponding list to standard output, separated by the string $"->".$ Otherwise, write the message $$Word not found$$