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This is because Sage's preparser transforms the 0
in px1[0,0]
into Sage's integers, while the object pxl
is expecting Python's integers. The solution is to force the conversion to Python's integers via int()
:
pxl[int(0),int(0)]
More generally to check what Sage's preparser is doing with things you type, use the preparse
command:
sage: preparse("pxl[0,0]")
'pxl[Integer(0),Integer(0)]'
(Integer()
is for Sage's integers, while int()
is for Python's integers).