Question

Can this be done in python?
Start by print an infinite loop and changing values in between loops.

x = 5
while ( true ):
  print x
x = 3 # regain control of the interpreter and set to new value

expected output:

5
5
5
......
3
3
3

Answer 1

No, the code as you have written it will not work. The statement after the non-terminating loop will never get executed.

Try the following:

x = 5
while True:
  if (some-condition):
    x = 3
  print x

Alternatively, use threading, and change the value of x in a second thread:

def changeX():
  global x
  x = 3

x = 5
import threading
threading.Timer(3, changeX).start()  # executes changeX after 3 seconds in a second thread

while True:
  print x