Simple implementation of python progress bar script

Recently, I need to use Python to write a small script, which USES 1 little knowledge. Please find time to record 1. Not deep but often used.

Two progress bar examples, copy to run:

# coding=utf-8

import sys
import time

# width: Width,   percent: The percentage 
def progress(width, percent):
  print "\r%s %d%%" % (('%%-%ds' % width) % (width * percent / 100 * '='), percent),
  if percent >= 100:
    print
    sys.stdout.flush()


#  The sample 1. 0%--100%
def demo1():
  for i in xrange(100):
    progress(50, (i + 1))
    time.sleep(0.1)


##  The sample 2.  Cycle loading 
def demo2():
  i = 19
  n = 200
  while n > 0:
    print "\t\t\t%s \r" % (i * "="),
    i = (i + 1) % 20
    time.sleep(0.1)
    n -= 1


demo1()
demo2()

Provides a simple, self-written asynchronous progress bar that can be turned on before time-consuming operations and then stopped at the end of time-consuming operations.

import time
import thread
import sys

class Progress:
  def __init__(self):
    self._flag = False
  def timer(self):
    i = 19
    while self._flag:
      print "\t\t\t%s \r" % (i * "="),
      sys.stdout.flush()
      i = (i + 1) % 20
      time.sleep(0.05)
    print "\t\t\t%s\n" % (19 * "="),
    thread.exit_thread()
  def start(self):
    self._flag = True
    thread.start_new_thread(self.timer, ())
  def stop(self):
    self._flag = False
    time.sleep(1)

Usage:

progress = Progress()
progress.start()
time.sleep(5)
progress.stop()