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This is a known issue with the fnmatch module (what glob
uses under the covers).  According to the documentation of
the translate method that converts patterns into regular
expressions... "There is no way to quote meta-characters." 
The fact that "[]" works but "[ ]" doesn't work is a
convenient bug, for those who want to use "[]".

If you can come up with some similar but non-ambiguous
syntax to update the fnmatch module, I'm sure it would be
considered, but as-is, I can't see this as a "bug" per-se.