Re: Using eval with substitutions

abhishek@xxxxxxxxxxxxxxxx wrote:

a,b=3,4
x="a+b"
eval(x)
7
y="x+a"

Now I want to evaluate y by substituting for the evaluated value of x.
eval(y) will try to add "a+b" to 3 and return an error. I could do
this,
eval(y.replace("x",str(eval(x))))
10

but this becomes unwieldy if I have
w="y*b"
and so on, because the replacements have to be done in exactly the
right order. Is there a better way?

instead of

x = "a+b"

do

x = "a+b"
x = eval(x)


or

x = eval("a+b")

(I'm afraid I don't really understand the point of your examples; what is it you're really trying to do here ?)

</F>

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