Iterate through folder and access two files at once in python

Question

I have a folder with two different types of files i.e.

    k_0_1.m 
    k_0_2.m
    k_0_40.m

and

    eq_0_1.txt
    eq_0_2.txt
    eq_0_40.txt

The goal is to access always both files which are corresponding i.e.

k_0_1.m, eq_0_1.txt

I started to iterate over the first type of file but how do I access the other file. The goal is that in each file are matrices which are corresponding.

for file in os.listdir('directory'):
    filename = os.fsdecode(file)
    if filename.startswith('k_0_'):
       continue

can you just open one, read it, then open the other and read that? then do whatever operations you need? — SuperStew
– SuperStew, Commented Feb 4, 2019 at 17:17
read in both files and do your post processing after you have the data in memory. — eagle33322
– eagle33322, Commented Feb 4, 2019 at 17:21

r.ook · Accepted Answer · 2019-02-04 17:28:04Z

1

for file1 in os.listdir('directory'):
    if file1.endswith('.m') and file1.startswith('k_0_'):
        file2 = file1name.replace('k', 'eq').replace('.m', '.txt')

        with open(file1, 'r') as f1, open(file2, 'r') as f2:
            # ... do what you need with f1 and f2
            # change the mode from 'r' to the appropriate mode you require

edited Feb 4, 2019 at 17:28

answered Feb 4, 2019 at 17:23

r.ook

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