[FIXED] How to return value from exec in function?

Issue

I try:

def test(w,sli):
    s = "'{0}'{1}".format(w,sli)
    exec(s)
    return s

print test("TEST12344","[:2]")

its return 'TEST12344'[:2]

How to return value from exec in function

Solution

exec() doesn't just evaluate expressions, it executes code. You would have to save a reference within the exec() call.

def test(w, sli):
    exec('s = "{}"{}'.format(w, sli))
    return s

If you just want to evaluate an expression, use eval(), and save a reference to the returned value:

def test(w,sli):
    s = "'{0}'{1}".format(w,sli)
    s = eval(s)
    return s

However, I would recommend avoiding exec() and eval() in any real code whenever possible. If you use it, make sure you have a very good reason to do so.

Answered By - TigerhawkT3

Answer Checked By - Robin (PHPFixing Admin)