Python简单进度条示例

最近需要用Python写一个小脚本,用到了一些小知识,赶紧抽空记录一下。不深但是常用。

两个进度条示例,拷贝就能运行:

# coding=utf-8

import sys
import time

# width:宽度,   percent:百分比
def progress(width, percent):
    print "\r%s %d%%" % (('%%-%ds' % width) % (width * percent / 100 * '='), percent),
    if percent >= 100:
        print
        sys.stdout.flush()


# 示例一、0%--100%
def demo1():
    for i in xrange(100):
        progress(50, (i + 1))
        time.sleep(0.1)


##  示例二、周期加载
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()

提供一个自己写的一个简单异步进度条,可以在耗时操作前开启,然后再耗时操作结束后停止。

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)

用法:

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

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