The documentation for typing.TypeVar gives these two examples:
T = TypeVar('T') # Can be anything
A = TypeVar('A', str, bytes) # Must be str or bytes
I was suprised to find out that the following does not work, exception says
that TypeVar is not definable with only one constraint:
A = TypeVar('A', type) # Must be a type, like class Foo, etc (rather
than an instance of a type)
The TypeVar source code explicitely forbids only one type constraint, what
is the rationale behind this?
For those who wonder, my function parameter expects a type rather than an
instance of a type, and returns a type.
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Oliver
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