Simple progress indicator copy/paste function for Python scripts

progress.py

# -*- coding: utf-8 -*-

import sys

_last_status = None
_last_status_permille = 0
def print_status(status=None, fraction=0):
    global _last_status, _last_status_permille
    permille = int(fraction * 1000)
    if status != _last_status:
        if _last_status:
            sys.stdout.write(u'\r{} ✅        \n'.format(_last_status))
            sys.stdout.flush()
        _last_status = status
    elif permille == _last_status_permille:
        return
    if not status:
        _last_status_permille = 0
        return
    _last_status_permille = permille
    sys.stdout.write(u'\r{}… {:.01f}% ⏳'.format(status, fraction * 100))
    sys.stdout.flush()

# Usage:

print_status('Performing slow task')
# Outputs: Performing slow task… 0.0% ⏳
print_status('Performing slow task', 0.123)
# Outputs: Performing slow task… 12.3% ⏳
print_status('Performing slow task', 0.1234)
# Outputs nothing! (Only outputs something when display needs to change.)

# Show that previous task is complete before starting another one (optional):
print_status()
# Outputs: Performing slow task ✅