Pythons equivalent to PHP's file(fn, FILE_IGNORE_NEW_LINES)

Question

I want to read a file in python and put each new line into an array. I know how to do it in PHP, with the file(fn, FILE_IGNORE_NEW_LINES); function and it's FILE_IGNORE_NEW_LINES parameter, but how do I do it in Python?

score 1 · Answer 1 · answered Dec 11 '13 at 01:44

When reading a file (line-by-line), usually the new line characters are appended to the end of the line, as you loop through it. If you want to get rid of them?

with open('filename.txt', 'r') as f:
    for line in f:
        line = line.strip('\n')
        #do things with the stripped line!

James Mills · Answer 2 · 2013-12-11T01:42:35.403

0

This is the same as (In Python):

with open("file.txt", "r") as f:
    for line in f:
        line = line.rstrip("\n")
        ...

edited Dec 11 '13 at 01:42

answered Dec 11 '13 at 01:35

James Mills

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No, no it's not. `FILE_IGNORE_NEW_LINES` strips newline characters from the ends of the strings. `FILE_SKIP_EMPTY_LINES` skips empty lines. Also, `if not line` is backward, and it won't work anyway since the lines all have newline characters on them. – user2357112 Dec 11 '13 at 01:43
Noted (*I'm not a PHP Developer*). Updating my answer... – James Mills Dec 11 '13 at 01:44

Rushy Panchal · Answer 3 · 2013-12-11T02:54:45.823

0

You want this:

with open('filename.txt', 'r') as f:
    data = [line.replace('\n', '') for line in f]

edited Dec 11 '13 at 02:54

answered Dec 11 '13 at 01:35

Rushy Panchal

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That would load the whole file, wouldn't it? – aIKid Dec 11 '13 at 01:42
``f.readlines()`` will read in the entire file. Yes. – James Mills Dec 11 '13 at 01:43
1

You don't need the `f.readlines()` call. That creates an unnecessary additional list. You can just use `for line in f`. – user2357112 Dec 11 '13 at 01:44
would `data = [line.strip() for line in f]` do the trick as well? (no need to read all lines an extra time with `readlines` and `.strip()` takes care of `\r\n` or other line-enders, as seen on windows systems, for example) – inspectorG4dget Dec 11 '13 at 01:45
Not if non-newline whitespace at the start or end of a line is significant. Also, opening the file in text mode should take care of newline conversion, or universal newlines mode if you want to handle mixed newline types in a single file. – user2357112 Dec 11 '13 at 01:46
@user2357112 -- In that case, you could use `line.rstrip('\n')` – mgilson Dec 11 '13 at 01:51

Pythons equivalent to PHP's file(fn, FILE_IGNORE_NEW_LINES)

3 Answers3