Let's say that I have a line of code that is a string:
a="print 'x + y = ', x + y"
Now I want to execute it using eval()
So if I have already given x & y values beforhand, I know that can write:
eval (compile (a,"test.py", "single"))
And it will work great.
But I want to give them values from a dict. In other words, if I have a dict:
b={'x':4,'y':3}
I want the values that will go into x & y to come from b.
How do I do this?
Have you checked the documentation for eval()? There's a couple more parameters you can use for exactly this purpose. For example:
>>> b = {'x':4,'y':3}
>>> eval("x + y", b)
7
print, then you just need to put the pieces together. For example, eval(compile("print x + y", "<string>", "single"), b)For statements, you should use exec:
in Python 2.x:
exec "print 'x + y = ', x + y" in {'x':4,'y':3}
in Python 3.x:
exec("print('x + y = ', x + y)", {'x':4,'y':3})
(of course, print is not a statement in Python 3, so there is no need in this case)
