Create (sane/safe) filename from any (unsafe) string

Question

I want to create a sane/safe filename (i.e. somewhat readable, no \"strange\" characters, etc.) from some random Unicode string (mich might contain just anything).

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Answer 1

If you don't mind to import other packages, then werkzeug has a method for sanitizing strings:

from werkzeug.utils import secure_filename

secure_filename("hello.exe")
'hello.exe'
secure_filename("/../../.ssh")
'ssh'
secure_filename("DROP TABLE")
'DROP_TABLE'

#fork bomb on Linux
secure_filename(": () {: |: &} ;:")
''

#delete all system files on Windows
secure_filename("del*.*")
'del'

https://pypi.org/project/Werkzeug/