Utilizing objects in another class in Python

Question

In code(pseudo) like this

def path():
    dirList = ['c:\\', 'y:\\', 'z:\\']
    home_folder = 'peter.txt'
    complete = [s + home_folder for s in dirList]
    print complete

def fileWrite():
    filename = 'c:\peter.txt'
    text = 'Hello World'
    file = open(filename, 'w')
    file.write(text)
    file.close()

I can make both work. I want all the items from the first to be iterated and run in the second. I am not entirely sure how to do that. Any help, much appreciated.

Have you read about the return statement yet? docs.python.org/reference/… — S.Lott
– S.Lott, Commented Jan 13, 2010 at 18:00
Also, these are functions, not classes. Perhaps you should fix your question title. — S.Lott
– S.Lott, Commented Jan 13, 2010 at 18:02
This guy is a noob. Someone please post code using yield keyword. I do not think s[he] can write it independently just yet. — Hamish Grubijan
– Hamish Grubijan, Commented Jan 13, 2010 at 18:03

Adam Crossland · Accepted Answer · 2010-01-13 18:29:05Z

1

import os

def paths(filename):
    dirList = ['c:\\', 'y:\\', 'z:\\']
    complete = [os.path.join(s, filename) for s in dirList]
    return complete

def fileWrite():
    for each_file in paths('c:\\peter.txt'):
        text = 'Hello World'
        file = open(each_file, 'w')
        file.write(text)
        file.close()

Or, as Ipthnc points out below, the paths function can be shortened to:

def paths(filename):
    return [os.path.join(s, filename) for s in ('c:\\', 'y:\\', 'z:\\')]

edited Jan 13, 2010 at 18:29

answered Jan 13, 2010 at 18:06

Adam Crossland

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1 Comment

Hamish Grubijan Over a year ago

or ... dirList = ('c:\\', 'y:\\', 'z:\\') - tuple is all that is needed return (os.path.join(s, filename) for s in dirList) - a generator will do because it is used in for loop only. Sorry to be be a pain, just wanted to show cool stuff.

bluszcz · Accepted Answer · 2010-01-13 18:02:08Z

1

If I understand question correclty - you can add additional parameter to fileWrite like fileWrite(filename) and simply iterate over 'complete' sequence.

answered Jan 13, 2010 at 18:02

bluszcz

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2 Comments

Adam Crossland Over a year ago

Yes, clearly. The complete object is a list, so if he just returns it from path(), he should be able to write for each_path in path():

Hamish Grubijan Over a year ago

One could call fileWrite from the first function. If the two are to communicate through a return, they better use an iterator and not a list - saves space = good practice.

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