Am I doing something wrong in the session below?
I admit that I do not understand python types and methods yet. When
can I apply the functional notation, when the method notation? It
seems that it's not a language thing, because they often return
different things. As another example, Mod(5,3) and mod(5,3) seem to
agree, while 5.mod(3) is different and 5.Mod(3) is an error.
Is a method responsible for checking whether it's arguments are ofthe
right type/parent, or is there a possibility to restrict the
arguments to a given type/parent?
Martin
sage: reset()
sage: R=Set(range(0,20,2))
sage: R
{0, 2, 4, 6, 8, 10, 12, 14, 16, 18}
sage: R.type()
---------------------------------------------------------------------------
AttributeError Traceback (most recent call
last)
/home/rubey/<ipython console> in <module>()
AttributeError: 'Set_object_enumerated' object has no attribute 'type'
sage: R.parent()
---------------------------------------------------------------------------
AttributeError Traceback (most recent call
last)
/home/rubey/<ipython console> in <module>()
AttributeError: 'Set_object_enumerated' object has no attribute
'parent'
sage: type(R)
<class 'sage.sets.set.Set_object_enumerated'>
sage: parent(R)
<class 'sage.sets.set.Set_object_enumerated'>
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