Question

Write a case-insensitive pattern searcher that prompts the user for a file name and a pattern, and the program reports on the number of times the pattern occurs within the file.

If you were searching for the pattern "ab" occurrences of "ab", "AB", "aB", "Ab"  would all contribute to the count.

Hint: The argument to the string function count could be a multi-character string.

Shown here are three sample runs of the program:

>>> main()

Enter file name: AllYouNeedIsLove.txt

Enter string to search for in file: love

love appears in the file AllYouNeedIsLove.txt 41 times

>>> main()
Enter file name: AllYouNeedIsLove.txt

Enter string to search for in file: LoVe

LoVe appears in the file AllYouNeedIsLove.txt 41 times

>>> main()

Enter file name: AllYouNeedIsLove.txt

Enter string to search for in file: hate

hate appears in the file AllYouNeedIsLove.txt 0 times

>>> 

Answer 1

If you have any doubts, please give me comment...

def main():

    fname = input("Enter file name: ")

    search_pattern = input("Enter string to search for in file: ").lower()

    count = 0

    fp = open(fname, "r")

    for line in fp.readlines():

        count += line.lower().count(search_pattern)

    fp.close()

    print(search_pattern+" appears in the file "+fname+" "+str(count)+" times")

main()