I was trying to inherit xrange
to enable the target object behaviors of an integer list (iterable and in
operator support). But I got the following error message:
TypeError: Error when calling the metaclass bases
type 'xrange' is not an acceptable base type
What's special of xrange
?
Also, probably not related to that question, I noticed xrange
has not method __contains__
. For in
operation, my basic knowledge is, a in A
is equivalent to A. contains (a). Am I wrong, or xrange
is something different?
I don't know if I should paste these as two separated questions. Appologize ahead.
xrange
is implemented in C . As you can see in Tim Peters' post , there should be a convincing use case in order to justify the extra effort needed to allow subclassing of it.
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