Write to new non-existent file in same directory, Python 2.7

Question

I'm trying to read a document and write it into a new file (that doesn't exist) in the same directory as the read file

An example would be

test_infile='/Users/name/Desktop/test.txt'

in_file=open(test_infile,'r')
data=in_file.readlines()
out_file=open('test_outfile.csv','w')

out_file should create a new file called test_outfile.csv in the directory /Users/name/Desktop/test_outfile.csv

---

I worked with the os module and got

def function(test):
    import os
    in_file=open(test,'r')
    dir,file=os.path.split(test)
    temp=os.path.join('output.csv')
    out_file=open('output.csv','w')

 test_file='/Users/name/Desktop/test.txt'
 function(test_file)

it runs but nothing is created ?

Answer 1

Use the os.path.split function to split the directory path from the file name, and then the os.path.join function to stitch path constituents together:

import os
dir, file = os.path.split(test_infile)
out_file_name = os.path.join(dir, 'test_outfile.csv')

Please make sure you read the documentation of these functions, and the os.path module in general, since it's very useful.