import os

def remove_line_from_file(filename, line_to_remove, dirpath=''):
  
    filename = os.path.join(dirpath, filename)
    temp_path = os.path.join(dirpath, 'temp.txt')


    
    with open(filename, 'r') as f_read, open(temp_path, 'w') as temp:


        search_keywords=['Car','Train']                # Delete all sentences that contain these words
        
        for line in f_read:
            if (any(map(lambda word: word in line, search_keywords))):
                    
                if line.strip() == word:            #f line.strip() == line_to_remove:
                    continue
                temp.write(line)

        os.remove(filename)
        os.rename(temp_path, filename)
        directory = 'C:/Users/Home/Desktop/test/'
        dirpath, _, files = next(os.walk(directory))

        for f in files:
            remove_line_from_file(f, line, dirpath)

#!/usr/bin/python3
import os

def remove_line_from_file(filename, dirpath):
    filename  = os.path.join(dirpath, filename)
    temp_path = os.path.join(dirpath, filename + '.tmp')
    search_keywords = ['Car','Train']

    with open(filename, 'r') as f_read, open(temp_path, 'w') as temp:
        for line in f_read:
            found = False
            for word in search_keywords:
                if word in line:
                    found = True
            if not found:
                temp.write(line)

    #os.rename(temp_path, filename)

#main
directory = './'
for root, dirs, files in os.walk(directory):
    for f in files:
        remove_line_from_file(f, directory)
#done