Serhiy Storchaka added the comment:

Maybe start emitting FutureWarning when groupdict() is called without an 
argument? groupdict(None) returns the same result but without a warning. After 
1 or 2 releases the behavior can be changed: groupdict() will return only 
matched groups.

nosy: +serhiy.storchaka
versions: +Python 3.7 -Python 3.4

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