getting source line number

[Skaperen]

Yes can use inspect for this.
Can make a function,then insert that function call will print line number.

import inspect

def line_numb():
   '''Returns the current line number in our program'''
   return inspect.currentframe().f_back.f_lineno

# print a message with source line number
n = 2 ; print('variable {} is at line {}'.format(n, line_numb()))
print('now printing at line {}'.format(line_numb()))

Output:
variable 2 is at line 8
now printing at line 9

this also gives me the solution to another long time problem: a function to display the name and value of a variable, given only one argument ... a string of the name (so a coding error by the user of this function cannot result in a mismatch)

from inspect import currentframe
from os import environ
def v(n):
    if 'nodebug' in environ:
        return
    x=currentframe().f_back.f_locals
    if n not in x:
        return print(n,'not assigned')
    return print(n,'=',repr(x[n]))

(*) code not tested

edit: correction applied to code: s/[0]//