lab5-extra

To complete the last part of the count_sub_in_file() task, you need to know how to catch an exception.

Relevant Socratica video:

count_sub_in_file(filename, s)

Write a function count_sub_in_file(filename, s) that takes two arguments: the substring s (of type string) and a filename (of type string). The function should return the number of occurrences of s in the file given through filename. (Note that each string object has a method count that should be used here.)

You can test your function count_sub_in_file on Alice’s Adventures in Wonderland:

  • How often does the substring “Alice” occur? Expect more than one hundred.

  • How often does the substring “Rabbit” occur? Expect a smaller number.

Modify the function count_sub_in_file(filename, s) so that if the file with name filename cannot be opened, the integer value -1 is returned (instead of the number of substrings s).

Please include the extra tasks in your file lab5.py and submit as Computing lab5 assignment.

Back to lab5.

End of lab5-extra.