How to check if a file exists in a folder starting with a substring and ending with a substring in Python

Question

I wanna wait for a file to donwload, and I want to check on a folder while the file not exists I'll put a time untill the file finish the download. The problem is I wanna check if the file exists starting with a substring variable called 'final_name' and ends with '.csv'. Could someone help me?

    final_name = name.replace(" ", "").replace('(', '').replace(')', '').replace('-', '')\
        .replace('/', '').replace(r"'", '')

    print(final_name)

    time.sleep(5)

    while not os.path.exists(final_name):
        time.sleep(1)

`Could someone help me?` - Which part do you need help with? — wwii, Jan 02 '23 at 02:15
[https://docs.python.org/3/library/glob.html](https://docs.python.org/3/library/glob.html), [https://docs.python.org/3/library/pathlib.html#pathlib.Path.glob](https://docs.python.org/3/library/pathlib.html#pathlib.Path.glob). — wwii, Jan 02 '23 at 02:25

Cydog · Accepted Answer · 2023-01-02T00:28:59.220

1

You can use this function to check if the file exists. It lists all files in a directory and loops over them and checks if a file starts and ends with the specified strings.

Code:

import os

def path_exists(directory, start, end):
    files = os.listdir(directory)
    for file in files:
        if file.startswith(start) and file.endswith(end):
            return True
    return False

# "./" is the current directory.
print(path_exists("./", final_name, ".csv"))

edited Jan 02 '23 at 00:28

answered Jan 02 '23 at 00:22

Cydog

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But this function will wait until the file has been created? – Jhonatta Silva Jan 02 '23 at 00:25
@JhonattaSilva you can use this function instead of `os.path.exists()` in your example, then it will wait until the file is created. – Cydog Jan 02 '23 at 00:27

How to check if a file exists in a folder starting with a substring and ending with a substring in Python

1 Answers1