find_word.py

#!/usr/bin/python3

import sys


def main():
    try:
        options = ['-i', '--ignore-case']
        fhand = open(sys.argv[-1])
        word = sys.argv[(-1) - 1]
        if word.startswith('-'):
            raise Exception(getUsage())
        elif sys.argv[1] not in options and len(sys.argv) == 4:
            print(sys.argv[1])
            raise Exception(getUsage())
    except:
        raise Exception(getUsage())

    x = findWord(word, fhand)
    for line in x:
        print(line)


def findWord(word, file):
    arguments = sys.argv
    lineList = []
    if arguments[1] == '-i' or arguments[1] == '--ignore-case':
        ignoreCase = True
    else:
        ignoreCase = False

    if ignoreCase:
        word = word.lower()
        for line1 in file:
            if word in line1.lower():
                lineList.append(line1)
    else:
        for line1 in file:
            if word in line1:
                lineList.append(line1)

    return lineList


def getUsage():
    return f'usage: {sys.argv[0]} [-i | --ignore-case ignore case] <word> <file>'


if __name__ == "__main__":
    main()