partial objects are callable objects created by partial().
They have three read-only attributes:
func
A callable object or function. Calls to the partial object will
be forwarded to func with new arguments and keywords.
args
The leftmost positional arguments that will be prepended to the
positional arguments provided to a partial object call.
keywords
The keyword arguments that will be supplied when the partial object
is called.
partial objects are like function objects in that they are
callable, weak referencable, and can have attributes. There are some
important differences. For instance, the __name__ and
__doc__ attributes are not created automatically. Also,
partial objects defined in classes behave like static methods and
do not transform into bound methods during instance attribute look-up.
