CODEWITHSUNDEEP
python
missingfours
missingfours

Reputation: 47

Skip for loop if file exists

I am processing some files from a folder that is being frequently updated. I need to add a piece of code that would check whether the file is already in a folder, and if not then go ahead with processing. If yes, then just skip and go for another one. So far I have this:

files_processed = os.listdir(path) # ['AZ_saturday_id-1', 'AZ_saturday_id-2', 'AZ_sunday_id-1', 'BY_saturday_id-1']

initials = ['AZ', 'BY', 'CX']
day = ['saturday', 'sunday']
id = [1, 2, 3, 4, 5]

files = []

for init in initials:
    for d in day:
        for i in id:
            name = f'{init}_{d}_id-{i}'

            if name in files_processed:
                continue
            
            files.append(name)

But this doesn't do what I would expect. The variable files gets all file names created in the for loop but it should have only the ones that do not exist in the files_processed yet.

When I try:

name in files_processed

that evaluates to True/False correctly but it doesn't work in the loop. Any ideas?

Upvotes: 0

Views: 1591

Answers (1)

Itamar
Itamar

Reputation: 11

You can use the os library, like so:

import os

os.path.exists("file.txt")

Or like this:

import os.path

if os.path.isfile('filename.txt'):
    print ("File exists")
else:
    print ("File does not exist")

Upvotes: 1

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