operator precedence
sage: 3==3+1
False
Correct, because concerning to the perecedence list on
http://www.sagemath.org/doc/tutorial/appendix.html + has a higher
precedence than ==. The text says, that the table is based on the table
in ยง 5.14 of the /Python Language Reference Manual/, but that is not
complete as well.
There the shortcut operators +=, -=, *=, /= are missing and the =
(normally equivalent precedence) are missing as well.
sage: x=3==3
sage: x+=3==3
sage: x
2
sage:
Parenthesis have high precendence, normally highest (beside Object
operators), but are missing in Sage table
sage: (3==3)+1
2
sage: a=3==3; b=a+1
sage: a,b
(True, 2)
sage:
sage:
The Operator == has higher precedence than =, but the later is missing
as well in the sage table.
Regards BB
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