patch 8.0.1832: cannot use :unlet for an environment variable commit https://github.com/vim/vim/commit/137374fd6538cf9dee0cb22907728d8fdecb5832 Author: Bram Moolenaar <Bram@vim.org> Date: Sun May 13 15:59:50 2018 +0200 patch 8.0.1832: cannot use :unlet for an environment variable Problem: Cannot use :unlet for an environment variable. Solution: Make it work. Use unsetenv() if available. (Ken Takata, closes #2855)

#!/usr/bin/python
#
# Program that writes a number to stdout repeatedly
#
# This requires Python 2.6 or later.

from __future__ import print_function
import sys
import time

if __name__ == "__main__":

    done = 0
    while done < 10:
        done = done + 1
        print(done)
        sys.stdout.flush()
        time.sleep(0.05)  # sleep 50 msec