python实现一个控制台下的进度条

　　今天写练习爬虫感觉很需要个进度条，就随手用函数实现了一个，到了晚上突然感觉到这个东西应该单独写出来以后肯定用用得着。

　　代码也很简单，我就不细讲了，直接上代码了。

　　测试代码:

　　instance.py　　

import bar
import time

bar = bar.ProgressBar(50,0,2)

for i in range(50):
    bar.move()
#    if i == 15:
#         bar.reset_pram(30,count=100,width=3)
    bar.bar_run()
    time.sleep(0.2)

　　 bar.py　

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

‘‘‘
@author Zhang Te
Created on Jan 27 2016
‘‘‘

import sys

class ProgressBar:
    ‘‘‘
    doc: This class has been created for something such as waiting for spyder or downloading music in python.
    ‘‘‘

    def __init__(self,total = 0,count = 0,width = 1):

        self.total = total
        self.width = width
        self.count = count

    def reset_pram(self,total = 0,count = 0,width = 1):

        sys.stdout.write(‘ ‘ * ( self.total * self.width + 8) + ‘\r‘)
        sys.stdout.flush()
        self.total = total
        self.count = count
        self.total = total

    def move(self):

        if self.count != self.total:
            self.count += 1

    def bar_run(self):

        if self.count <= self.total:
            sys.stdout.write(‘ ‘ * self.count * self.width + ‘\r‘)
            sys.stdout.flush()

            sys.stdout.write(‘{0:3}/{1:3} ‘.format(self.count,self.total) )
            sys.stdout.write(‘#‘ * self.width * self.count + ‘-‘ * (self.total - self.count) * self.width + ‘\r‘)        

            sys.stdout.flush()
        else:
            self.count = self.total