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How to Sanitize Filenames in Python

Strip illegal filename characters and clean up names for safe filesystem use.

import re
from pathlib import Path

def sanitize_filename(filename: str, replacement: str = "_") -> str:
    """
    Remove illegal characters from a filename.
    
    Illegal characters: / \\ : * ? " < > |
    Also strips leading/trailing spaces and dots.
    """
    # Remove illegal characters
    sanitized = re.su…

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PythonSkillset code samples are short, focused examples organised by topic and difficulty. Every snippet is server-rendered HTML — readable by search engines and easy to copy. Open any sample, read the notes, copy the code, then press Try in editor to run it in the browser with Pyodide.

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