[issue40426] Unable to use lowercase hexadecimal digits for percent encoding

[Eisuke Kawashima]

Eisuke Kawashima <e.kawaschima+python at gmail.com> added the comment:

> Why do you require a lower case string here?

Well, I want to use urllib.parse.quote to escape special characters, such as ()[]#*/\, in filenames, and for visibility lower hex digits are preferable.
PR 19766 does not break compatibility.

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<https://bugs.python.org/issue40426>
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