Vedran Čačić added the comment:
The weirdest thing is that it already works pretty well in output of re.compile.
>>> re.compile('', re.I | re.M)
re.compile('', re.IGNORECASE|re.MULTILINE)
>>> _.flags # re.UNICODE == 32 added automatically
42
So the only thing we should enhance is the output of .flags, and it seems that
all the necessary code is already in the source code of __repr__ of SRE_Pattern
objects.
Also, I suppose that means you've given up on the autocreation (since the
values _are_ semantical here), and I suppose you'll require all the declared
values to be powers of 2. With those conditions, I think this is a good
enhancement of Python.
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<http://bugs.python.org/issue23591>
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