Python: How to get argument's name runtime

Question

in Python : may be so obvious, :) anyway, we are looking for ? , below:

def printname(x):
   print ?,x

>>> a = 1.3
>>> printname(a)
>>> 'a',1.3

so something instead of ? to represent the name of passed argument.
if not that obvious ? any trick or solution?

Answer 1

You can't possibly know this. Objects don't know their names. They can have many names, or none at all, if they're simply an item in another object or list.

Answer 2

It's not impossible . You need to traverse back up stack frames and find the line of code that calls the function.

It's an ok hack to do for debugging, but no way I would use it in real code

Here's a starting point for you:

import inspect
def printname(x):
    print inspect.stack()[1][4]

a = 1.3
printname(a)