Remove characters after forward slash in file

Question

I have a.csv file with this content:

HEAD / HTTP/1.1

POST /app/something1/ HTTP/1.1

GET /app/something2/ HTTP/1.1

GET /app/something3/ HTTP/1.1

and can't find a way to remove everything after the first fw slash.

I've tried some regex but without such a knowledge it looks more difficult than going with python.

This is basic code that I've tried:

with open('log1.csv') as f:
    for line in f:
        f[:f.index("/")]

The expected result is this:

Head

POST

GET

GET

Can you please assist me on the right code portion?

Answer 1

You just need to read each line in, and split() on '\' and index the first item:

# Open the file in read more
# mode='r' by default if you don't specify
with open('log1.csv') as f:

    # Read each line from the iterator
    for line in f:

        # Strip newlines
        line = line.strip()

        # Only process non-empty lines
        if line:

            # Split the line and take the first item
            print(line.split('/')[0])

Output:

HEAD 
POST 
GET
GET