python中确保字符串适合作为文件名的优雅方式？

Question

I want to use a user-provided string as a filename for exporting, but have to make sure that the string is permissible on my system as a filename. From my side it would be OK to replace any forbidden character with eg '_'.

Here I found a list of forbidden characters for filenames .

It should be easy enough to use the str.replace() function, I was just wondering if there is already something out there that does that, potentially even taking into account what OS I am on.

Answer 1

pathvalidate is a Python library to sanitize/validate a string such as filenames/file-paths/etc.

This library provides both utilities for validation of paths:

import sys
from pathvalidate import ValidationError, validate_filename

try:
    validate_filename("fi:l*e/p\"a?t>h|.t<xt")
except ValidationError as e:
    print("{}\n".format(e), file=sys.stderr)

And utilities for sanitizing paths:

from pathvalidate import sanitize_filename

fname = "fi:l*e/p\"a?t>h|.t<xt"
print("{} -> {}".format(fname, sanitize_filename(fname)))

Answer 2

A better solution may be for you to store the files locally using generated filenames that are guaranteed to be unique and file system safe (any UUID generator would do, for example). Maintain a simple database that maps between the original filename and the UUID for later use.