Writing to Multiple Files in Python

Question

I want to write "print 'hello'" to a bunch of *.py files in the same directory. How do you do that? I've searched all over the Web and SO, and I can't find out how.

Like in pseudo-code, "all files with *.py in a certain directory, open and write 'print 'hello'', close file".

I'm sorry, I'm a n00b, I just started learning Python.

Try writing out the actual pseudo-code. It will look remarkably similar to the real Python code. — Matt Ball
– Matt Ball, Commented Nov 1, 2011 at 21:28
Do you want to over-write the contents, or append to the file? — wim
– wim, Commented Nov 1, 2011 at 21:29

Nicolas · Accepted Answer · 2011-11-01 21:33:01Z

4

You can use glob:

import glob
for file in glob.glob("*.py"):
    with open(file, "a") as f:
        # f.write("print 'hello'")
        # etc.

answered Nov 1, 2011 at 21:33

Nicolas

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Comments

Fred Foo · Accepted Answer · 2011-11-01 21:30:26Z

0

Use glob.glob to select files by pattern.

from glob import glob
from os.path import join

for f in glob(join(DIRECTORY, '*.pyc')):
    # open f and write the desired string to it

answered Nov 1, 2011 at 21:30

Fred Foo

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5 Comments

Matt Over a year ago

using this, I made it: from glob import glob from os.path import join for f in glob(join(DIRECTORY, '*.py')): # open f and write the desired string to it f = open("f", "wb") f.write( "Python is a great language.\nYeah its great!!\n"); f.close()

Matt Over a year ago

did I do that correctly? I've got a feeling that I flubbed up really really badly

Matt Over a year ago

just tried it out, and it says that "DIRECTORY" isn't defined

Matt Over a year ago

it's a compiled python program, isn't it?

Karl Knechtel Over a year ago

*.pyc are binary files containing the compiled Python bytecode. Trying to write to them might not be a great idea. (Of course, you can always just trash them and let the compiler re-compile them from the corresponding source.)

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