How to trim text from file and put it another file using python?

February 3, 2023

I have a text file called file1 like


    
        HelloWorldTestClass
        MyTestClass2
        MyTestClass4
        MyHelloWorld        
        ApexClass
    
    
        *
        ApexTrigger
    
    
        Book__c
        CustomObject
    
    56.0

Now i want to output my file as in file2 which contains test in the word and have output like this

        HelloWorldTestClass
        MyTestClass2
        MyTestClass4

I have a code like this

import re
import os

file_contents1 = f'{os.getcwd()}/build/testlist.txt'
file2_path = f'{os.getcwd()}/build/optestlist.txt'
with open(file_contents1, 'r') as file1:
    
    file1_contents = file1.read()
   
# print(file1_contents)

# output = [file1_contents.strip() for line in file1_contents if "TestClass" in line]
# # Use a regudjlar expression pattern to match strings that contain "test"
test_strings = [x for x in file1_contents.split("\n") if re.search(r"test", x, re.IGNORECASE)]
# x = test_strings.strip("['t]")
# # Print the result
with open(file2_path, 'w') as file2:
    # write the contents of the first file to the second file
    for test in test_strings:
        file2.write(test)

But it is outputting
HelloWorldTestClass MyTestClass2 MyTestClass4

I didn’t find the related question if already asked please attached to it thanks

>Solution :

You can use the in operator with strings to check whether it contains your phrase:

with open('file1.txt', "r") as f_input:
    with open('file2.txt', "w") as f_output:
        for line in f_input:
            if "test" in line.lower():
                f_output.write(line)