Question

is it possible to store a variable from a while loop to a function and then call that same variable from the function at the end of the loop

for eg:during while loop, problem here is that when i try to retrieve the variable from store() it fails…as it needs arguments to be passed..

def store(a,b,c):
    x1 = a
    y1 = b
    z1 = c
    return (x1,y1,z1)

def main():
    while condition:
          x = .......
          y = .......
          z = .......
          ......
          ......
          store(x,y,z) #store to function...
          ......
          ......
          ......
          s1,s2,s3 = store()
          ......
          ......
          ......

Answer 1

Hmmm, unless I am misunderstanding, this is a classic non-solution to a non-problem.

Why not just use the language as it is?

while condition:

   x = something
   y = else
   z = altogether
   ...
   save_state = (x,y,z)   ## this is just a python tuple.
   ...
   # do something else to x, y and z, I assume
   ...
   x, y, z = save_state

Depending on the type of x, y and z you may have to be careful to store a copy into the tuple.

(Also, your indentation is wrong, and there is no such thing as end in python.)

Update: Ok, if I understand better, the question is just to be able to use the previous value the next time through. In the simplest case, there is no problem at all: the next time through a loop, the the value of x,y, and z are whatever they were at the end of the previous time through the loop (this is the way all programming languages work).

But if you want to be explicit, try something like this:

 x_prev = some_starting_value
 x = some_starting_value
 while condition:
      x = something_funky(x_prev)

      .... other stuff ....

      x_prev = x

(but again, note that you don’t need x_prev at all here: x=something_funky(x) will work.)