On Apr 17, 2009, at 11:49 AM, MikeF wrote:
> Thank you for the explanation. Not being familiar with python, I had
> no way of knowing wether it was Sage or python. The examples in Sage
> tend to use x, y & z as variable symbols so I naturally used them, as
> well. The logical construct of "print bool (symbol = symbol) should
> then not be used, I take it, as it generates a keyword error?
And it has a totally different meaning.
> And = should be replaced with ==? What occurs then when an
> assumption is
> explicitly symbol = some other symbol or , again, is the proper usage
> to use ==?
In Python, = is assignment (including to keyword arguments), wheras
== is equality testing.
sage: var('x,y,z')
(x, y, z)
Here we construct a symbolic equation.
sage: x == y
x == y
sage: type(x == y)
<class 'sage.calculus.equations.SymbolicEquation'>
This is an assignment--we have just overwritten the variable with a
new value.
sage: x = y
sage: x
y
sage: x = "some string"
sage: x
'some string'
- Robert
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