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Python显示进度条的方法,如何显示进度条

日期:2019-10-04编辑作者:网络安全

实现进度条最简单的办法就是,在输出完毕后,把光标移动到行首,继续在那里输出更长的进度条即可实现,新的更长的进度条把旧的短覆盖,就形成了动画效果。 

Python:如何显示进度条,Python:显示进度条

首先,推荐一个组件:progressive

效果如下:

金沙贵宾会官网 1

进度条和一般的print区别在哪里呢?

答案就是print会输出一个n,也就是换行符,这样光标移动到了下一行行首,接着输出,之前已经通过stdout输出的东西依旧保留,而且保证我们在下面看到最新的输出结果。

进度条不然,我们必须再原地输出才能保证他是一个进度条,否则换行了怎么还叫进度条?

最简单的办法就是,再输出完毕后,把光标移动到行首,继续在那里输出更长的进度条即可实现,新的更长的进度条把旧的短覆盖,就形成了动画效果。

可以想到那个转义符了吧,那就是 r。

转义符r就可以把光标移动到行首而不换行,转义符n就把光标移动到行首并且换行。

在python中,输出stdout(标准输出)可以使用sys.stdout.write
例如:

 

#!/usr/bin/env python
# -*- coding=utf-8 -*-
#Using GPL v2
#Author: [email protected]
##2010-10-27 22:07
"""
Usage:
Just A Template
"""
from __future__ import division

import sys,time
j = '#'
if __name__ == '__main__':
    for i in range(1,61):
        j += '#'
        sys.stdout.write(str(int((i/60)*100))+'%  ||'+j+'->'+"r")
        sys.stdout.flush()
        time.sleep(0.5)
print

第二种思路是用转义符b
转义符b是退格键,也就是说把输出的光标往回退格子,这样就可以不用+=了,例如:

#!/usr/bin/env python
# -*- coding=utf-8 -*-
#Using GPL v2
#Author: [email protected]
#2010-10-27 22:07
"""
Usage:
Just A Template
"""
from __future__ import division

import sys,time
if __name__ == '__main__':
    for i in range(1,61):
        sys.stdout.write('#'+'->'+"bb")
        sys.stdout.flush()
        time.sleep(0.5)
print

光标回退2格,写个#再回退,再写,达到增长的目的了

不过写这么多似乎是废话,在耳边常常听到一句话:那就是不要重复造轮子。实际上python有丰富发lib帮你实现这个东西,你完全可以把心思放在逻辑开发上而不用注意这些小细节

下面要介绍的就是这个类“progressbar”(

如图所示:

金沙贵宾会官网 2

下面就是基本使用举例:

#!/usr/bin/env python
# -*- coding=utf-8 -*-
#Using GPL v2
#Author: [email protected]
#2010-10-27 22:53
"""
Usage:
Just A Template
"""
from __future__ import division

import sys,time
from progressbar import *
total = 1000

#基本用法
progress = ProgressBar()
for i in progress(range(total)):
  time.sleep(0.01)

pbar = ProgressBar().start()
for i in range(1,1000):
    pbar.update(int((i/(total-1))*100))
    time.sleep(0.01)
pbar.finish()

#高级用法
widgets = ['Progress: ', Percentage(), ' ', Bar(marker=RotatingMarker('>-=')),
           ' ', ETA(), ' ', FileTransferSpeed()]
pbar = ProgressBar(widgets=widgets, maxval=10000000).start()
for i in range(1000000):
  # do something
  pbar.update(10*i+1)
  time.sleep(0.0001)
pbar.finish()

官方示例:

金沙贵宾会官网 3#coding:utf-8 import sys import time from progressbar import AnimatedMarker, Bar, BouncingBar, Counter, ETA, FileTransferSpeed, FormatLabel, Percentage, ProgressBar, ReverseBar, RotatingMarker, SimpleProgress, Timer examples = [] def example(fn): try: name = 'Example %d' % int(fn.__name__[7:]) except: name = fn.__name__ def wrapped(): try: sys.stdout.write('Running: %sn' % name) fn() sys.stdout.write('n') except KeyboardInterrupt: sys.stdout.write('nSkipping example.nn') examples.append(wrapped) return wrapped @example def example0(): pbar = ProgressBar(widgets=[Percentage(), Bar()], maxval=300).start() for i in range(300): time.sleep(0.01) pbar.update(i+1) pbar.finish() @example def example1(): widgets = ['Test: ', Percentage(), ' ', Bar(marker=RotatingMarker()), ' ', ETA(), ' ', FileTransferSpeed()] pbar = ProgressBar(widgets=widgets, maxval=10000000).start() for i in range(1000000): # do something pbar.update(10*i+1) pbar.finish() @example def example2(): class CrazyFileTransferSpeed(FileTransferSpeed): """It's bigger between 45 and 80 percent.""" def update(self, pbar): if 45 < pbar.percentage() < 80: return 'Bigger Now ' + FileTransferSpeed.update(self,pbar) else: return FileTransferSpeed.update(self,pbar) widgets = [CrazyFileTransferSpeed(),' <<<', Bar(), '>>> ', Percentage(),' ', ETA()]金沙贵宾会登录官网, pbar = ProgressBar(widgets=widgets, maxval=10000000) # maybe do something pbar.start() for i in range(2000000): # do something pbar.update(5*i+1) pbar.finish() @example def example3(): widgets = [Bar('>'), ' ', ETA(), ' ', ReverseBar('<')] pbar = ProgressBar(widgets=widgets, maxval=10000000).start() for i in range(1000000): # do something pbar.update(10*i+1) pbar.finish() @example def example4(): widgets = ['Test: ', Percentage(), ' ', Bar(marker='0',left='[',right=']'), ' ', ETA(), ' ', FileTransferSpeed()] pbar = ProgressBar(widgets=widgets, maxval=500) pbar.start() for i in range(100,500+1,50): time.sleep(0.2) pbar.update(i) pbar.finish() @example def example5(): pbar = ProgressBar(widgets=[SimpleProgress()], maxval=17).start() for i in range(17): time.sleep(0.2) pbar.update(i + 1) pbar.finish() @example def example6(): pbar = ProgressBar().start() for i in range(100): time.sleep(0.01) pbar.update(i + 1) pbar.finish() @example def example7(): pbar = ProgressBar() # Progressbar can guess maxval automatically. for i in pbar(range(80)): time.sleep(0.01) @example def example8(): pbar = ProgressBar(maxval=80) # Progressbar can't guess maxval. for i in pbar((i for i in range(80))): time.sleep(0.01) @example def example9(): pbar = ProgressBar(widgets=[金沙贵宾会官网,'Working: ', AnimatedMarker()]) for i in pbar((i for i in range(50))): time.sleep(.08) @example def example10(): widgets = ['Processed: ', Counter(), ' lines (', Timer(), ')'] pbar = ProgressBar(widgets=widgets) for i in pbar((i for i in range(150))): time.sleep(0.1) @example def example11(): widgets = [FormatLabel('Processed: %(value)d lines (in: %(elapsed)s)')] pbar = ProgressBar(widgets=widgets) for i in pbar((i for i in range(150))): time.sleep(0.1) @example def example12(): widgets = ['Balloon: ', AnimatedMarker(markers='[email protected]* ')] pbar = ProgressBar(widgets=widgets) for i in pbar((i for i in range(24))): time.sleep(0.3) @example def example13(): # You may need python 3.x to see this correctly try: widgets = ['Arrows: ', AnimatedMarker(markers='←↖↑↗→↘↓↙')] pbar = ProgressBar(widgets=widgets) for i in pbar((i for i in range(24))): time.sleep(0.3) except UnicodeError: sys.stdout.write('Unicode error: skipping example') @example def example14(): # You may need python 3.x to see this correctly try: widgets = ['Arrows: ', AnimatedMarker(markers='◢◣◤◥')] pbar = ProgressBar(widgets=widgets) for i in pbar((i for i in range(24))): time.sleep(0.3) except UnicodeError: sys.stdout.write('Unicode error: skipping example') @example def example15(): # You may need python 3.x to see this correctly try: widgets = ['Wheels: ', AnimatedMarker(markers='◐◓◑◒')] pbar = ProgressBar(widgets=widgets) for i in pbar((i for i in range(24))): time.sleep(0.3) except UnicodeError: sys.stdout.write('Unicode error: skipping example') @example def example16(): widgets = [FormatLabel('Bouncer: value %(value)d - '), BouncingBar()] pbar = ProgressBar(widgets=widgets) for i in pbar((i for i in range(180))): time.sleep(0.05) @example def example17(): widgets = [FormatLabel('Animated Bouncer: value %(value)d - '), BouncingBar(marker=RotatingMarker())] pbar = ProgressBar(widgets=widgets) for i in pbar((i for i in range(180))): time.sleep(0.05) @example def example18(): widgets = [Percentage(), ' ', Bar(), ' ', ETA(), ' ', AdaptiveETA()] pbar = ProgressBar(widgets=widgets, maxval=500) pbar.start() for i in range(500): time.sleep(0.01 + (i < 100) * 0.01 + (i > 400) * 0.9) pbar.update(i + 1) pbar.finish() @example def example19(): pbar = ProgressBar() for i in pbar([]): pass pbar.finish() try: for example in examples: example() except KeyboardInterrupt: sys.stdout('nQuitting examples.n') Progress Bar 使用例子

再发一个类:

#!/usr/bin/env python
# -*- coding=utf-8 -*-
#Using GPL v2
#Author: [email protected]
#2010-10-30 13:59
"""
Usage:
Just A Template
"""
class progressbarClass: 
    def __init__(self, finalcount, progresschar=None):
        import sys
        self.finalcount=finalcount
        self.blockcount=0
        #
        # See if caller passed me a character to use on the
        # progress bar (like "*").  If not use the block
        # character that makes it look like a real progress
        # bar.
        #
        if not progresschar: self.block=chr(178)
        else:                self.block=progresschar
        #
        # Get pointer to sys.stdout so I can use the write/flush
        # methods to display the progress bar.
        #
        self.f=sys.stdout
        #
        # If the final count is zero, don't start the progress gauge
        #
        if not self.finalcount : return
        self.f.write('n------------------- % Progress -------------------n')
        return

    def progress(self, count):
        #
        # Make sure I don't try to go off the end (e.g. >100%)
        #
        count=min(count, self.finalcount)
        #
        # If finalcount is zero, I'm done
        #
        if self.finalcount:
            percentcomplete=int(round(100*count/self.finalcount))
            if percentcomplete < 1: percentcomplete=1
        else:
            percentcomplete=100

        #print "percentcomplete=",percentcomplete
        blockcount=int(percentcomplete/2)
        #print "blockcount=",blockcount
        if blockcount > self.blockcount:
            for i in range(self.blockcount,blockcount):
                self.f.write(self.block)
                self.f.flush()

        if percentcomplete == 100: self.f.write("n")
        self.blockcount=blockcount
        return

if __name__ == "__main__":
    from time import sleep
    pb=progressbarClass(8,"*")
    count=0
    while count<9:
        count+=1
        pb.progress(count)
        sleep(0.2)

 

另外,python cookbook中11.1节也提供了一个不错的进度条类,代码如下:

import sys
class progressbar(object):
    def __init__(self, finalcount, block_char='.'):
        self.finalcount = finalcount
        self.blockcount = 0
        self.block = block_char
        self.f = sys.stdout
        if not self.finalcount: return
        self.f.write('n------------------ % Progress -------------------1n')
        self.f.write('    1    2    3    4    5    6    7    8    9    0n')
        self.f.write('----0----0----0----0----0----0----0----0----0----0n')
    def progress(self, count):
        count = min(count, self.finalcount)
        if self.finalcount:
            percentcomplete = int(round(100.0*count/self.finalcount))
            if percentcomplete < 1: percentcomplete = 1
        else:
            percentcomplete=100
        blockcount = int(percentcomplete//2)
        if blockcount <= self.blockcount:
            return
        for i in range(self.blockcount, blockcount):
            self.f.write(self.block)
        self.f.flush()
        self.blockcount = blockcount
        if percentcomplete == 100:
            self.f.write("n")

if __name__ == "__main__":
    from time import sleep
    pb = progressbar(8, "*")
    for count in range(1, 9):
        pb.progress(count)
        sleep(0.2)
    pb = progressbar(100)
    pb.progress(20)
    sleep(0.3)
    pb.progress(47)
    sleep(0.3)
    pb.progress(90)
    sleep(0.3)
    pb.progress(100)
    print "testing 1:"
    pb = progressbar(1)
    pb.progress(1)

运行结果如下:

金沙贵宾会官网 4

python怎在dos实现一个进度条

import os
from time import sleep
for i in range(101):
print '#'*i
sleep(0.2)
os.system('cls')

文件双击运行
不要在idle下运行  

本文实例讲述了Python显示进度条的方法,是Python程序设计中非常实用的技巧。分享给大家供大家参...

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本文实例讲述了Python显示进度条的方法,是Python程序设计中非常实用的技巧。分享给大家供大家参考。具体方法如下:

首先,进度条和一般的print区别在哪里呢?

答案就是print会输出一个n,也就是换行符,这样光标移动到了下一行行首,接着输出,之前已经通过stdout输出的东西依旧保留,而且保证我们在下面看到最新的输出结果。

进度条不然,我们必须再原地输出才能保证他是一个进度条,否则换行了怎么还叫进度条?

最简单的办法就是,再输出完毕后,把光标移动到行首,继续在那里输出更长的进度条即可实现,新的更长的进度条把旧的短覆盖,就形成了动画效果。

可以想到那个转义符了吧,那就是 r。

转义符r就可以把光标移动到行首而不换行,转义符n就把光标移动到行首并且换行。

在python中,输出stdout(标准输出)可以使用sys.stdout.write
例如:

#!/usr/bin/env python
# -*- coding=utf-8 -*-
#Using GPL v2
#Author: [email protected]
##2010-10-27 22:07
"""
Usage:
Just A Template
"""
from __future__ import division

import sys,time
j = '#'
if __name__ == '__main__':
  for i in range(1,61):
    j += '#'
    sys.stdout.write(str(int((i/60)*100))+'% ||'+j+'->'+"r")
    sys.stdout.flush()
    time.sleep(0.5)
print

第二种思路是用转义符b
转义符b是退格键,也就是说把输出的光标往回退格子,这样就可以不用+=了,例如:

#!/usr/bin/env python
# -*- coding=utf-8 -*-
#Using GPL v2
#Author: [email protected]
#2010-10-27 22:07
"""
Usage:
Just A Template
"""
from __future__ import division

import sys,time
if __name__ == '__main__':
  for i in range(1,61):
    sys.stdout.write('#'+'->'+"bb")
    sys.stdout.flush()
    time.sleep(0.5)
print

光标回退2格,写个#再回退,再写,达到增长的目的了

不过写这么多似乎是废话,在耳边常常听到一句话:那就是不要重复造轮子。实际上python有丰富发lib帮你实现这个东西,你完全可以把心思放在逻辑开发上而不用注意这些小细节

下面要介绍的就是这个类“progressbar”(

如下图所示:

金沙贵宾会官网 5

下面就是基本使用举例:

#!/usr/bin/env python
# -*- coding=utf-8 -*-
#Using GPL v2
#Author: [email protected]
#2010-10-27 22:53
"""
Usage:
Just A Template
"""
from __future__ import division

import sys,time
from progressbar import *
total = 1000

#基本用法
progress = ProgressBar()
for i in progress(range(total)):
 time.sleep(0.01)

pbar = ProgressBar().start()
for i in range(1,1000):
  pbar.update(int((i/(total-1))*100))
  time.sleep(0.01)
pbar.finish()

#高级用法
widgets = ['Progress: ', Percentage(), ' ', Bar(marker=RotatingMarker('>-=')),
      ' ', ETA(), ' ', FileTransferSpeed()]
pbar = ProgressBar(widgets=widgets, maxval=10000000).start()
for i in range(1000000):
 # do something
 pbar.update(10*i+1)
 time.sleep(0.0001)
pbar.finish()

官方示例:

#coding:utf-8
import sys
import time
from progressbar import AnimatedMarker, Bar, BouncingBar, Counter, ETA, 
  FileTransferSpeed, FormatLabel, Percentage, 
  ProgressBar, ReverseBar, RotatingMarker, 
  SimpleProgress, Timer

examples = []
def example(fn):
  try: name = 'Example %d' % int(fn.__name__[7:])
  except: name = fn.__name__

  def wrapped():
    try:
      sys.stdout.write('Running: %sn' % name)
      fn()
      sys.stdout.write('n')
    except KeyboardInterrupt:
      sys.stdout.write('nSkipping example.nn')

  examples.append(wrapped)
  return wrapped

@example
def example0():
  pbar = ProgressBar(widgets=[Percentage(), Bar()], maxval=300).start()
  for i in range(300):
    time.sleep(0.01)
    pbar.update(i+1)
  pbar.finish()

@example
def example1():
  widgets = ['Test: ', Percentage(), ' ', Bar(marker=RotatingMarker()),
        ' ', ETA(), ' ', FileTransferSpeed()]
  pbar = ProgressBar(widgets=widgets, maxval=10000000).start()
  for i in range(1000000):
    # do something
    pbar.update(10*i+1)
  pbar.finish()

@example
def example2():
  class CrazyFileTransferSpeed(FileTransferSpeed):
    """It's bigger between 45 and 80 percent."""
    def update(self, pbar):
      if 45 < pbar.percentage() < 80:
        return 'Bigger Now ' + FileTransferSpeed.update(self,pbar)
      else:
        return FileTransferSpeed.update(self,pbar)

  widgets = [CrazyFileTransferSpeed(),' <<<', Bar(), '>>> ',
        Percentage(),' ', ETA()]
  pbar = ProgressBar(widgets=widgets, maxval=10000000)
  # maybe do something
  pbar.start()
  for i in range(2000000):
    # do something
    pbar.update(5*i+1)
  pbar.finish()

@example
def example3():
  widgets = [Bar('>'), ' ', ETA(), ' ', ReverseBar('<')]
  pbar = ProgressBar(widgets=widgets, maxval=10000000).start()
  for i in range(1000000):
    # do something
    pbar.update(10*i+1)
  pbar.finish()

@example
def example4():
  widgets = ['Test: ', Percentage(), ' ',
        Bar(marker='0',left='[',right=']'),
        ' ', ETA(), ' ', FileTransferSpeed()]
  pbar = ProgressBar(widgets=widgets, maxval=500)
  pbar.start()
  for i in range(100,500+1,50):
    time.sleep(0.2)
    pbar.update(i)
  pbar.finish()

@example
def example5():
  pbar = ProgressBar(widgets=[SimpleProgress()], maxval=17).start()
  for i in range(17):
    time.sleep(0.2)
    pbar.update(i + 1)
  pbar.finish()

@example
def example6():
  pbar = ProgressBar().start()
  for i in range(100):
    time.sleep(0.01)
    pbar.update(i + 1)
  pbar.finish()

@example
def example7():
  pbar = ProgressBar() # Progressbar can guess maxval automatically.
  for i in pbar(range(80)):
    time.sleep(0.01)

@example
def example8():
  pbar = ProgressBar(maxval=80) # Progressbar can't guess maxval.
  for i in pbar((i for i in range(80))):
    time.sleep(0.01)

@example
def example9():
  pbar = ProgressBar(widgets=['Working: ', AnimatedMarker()])
  for i in pbar((i for i in range(50))):
    time.sleep(.08)

@example
def example10():
  widgets = ['Processed: ', Counter(), ' lines (', Timer(), ')']
  pbar = ProgressBar(widgets=widgets)
  for i in pbar((i for i in range(150))):
    time.sleep(0.1)

@example
def example11():
  widgets = [FormatLabel('Processed: %(value)d lines (in: %(elapsed)s)')]
  pbar = ProgressBar(widgets=widgets)
  for i in pbar((i for i in range(150))):
    time.sleep(0.1)

@example
def example12():
  widgets = ['Balloon: ', AnimatedMarker(markers='[email protected]* ')]
  pbar = ProgressBar(widgets=widgets)
  for i in pbar((i for i in range(24))):
    time.sleep(0.3)

@example
def example13():
  # You may need python 3.x to see this correctly
  try:
    widgets = ['Arrows: ', AnimatedMarker(markers='←↖↑↗→↘↓↙')]
    pbar = ProgressBar(widgets=widgets)
    for i in pbar((i for i in range(24))):
      time.sleep(0.3)
  except UnicodeError: sys.stdout.write('Unicode error: skipping example')

@example
def example14():
  # You may need python 3.x to see this correctly
  try:
    widgets = ['Arrows: ', AnimatedMarker(markers='◢◣◤◥')]
    pbar = ProgressBar(widgets=widgets)
    for i in pbar((i for i in range(24))):
      time.sleep(0.3)
  except UnicodeError: sys.stdout.write('Unicode error: skipping example')

@example
def example15():
  # You may need python 3.x to see this correctly
  try:
    widgets = ['Wheels: ', AnimatedMarker(markers='◐◓◑◒')]
    pbar = ProgressBar(widgets=widgets)
    for i in pbar((i for i in range(24))):
      time.sleep(0.3)
  except UnicodeError: sys.stdout.write('Unicode error: skipping example')

@example
def example16():
  widgets = [FormatLabel('Bouncer: value %(value)d - '), BouncingBar()]
  pbar = ProgressBar(widgets=widgets)
  for i in pbar((i for i in range(180))):
    time.sleep(0.05)

@example
def example17():
  widgets = [FormatLabel('Animated Bouncer: value %(value)d - '),
        BouncingBar(marker=RotatingMarker())]

  pbar = ProgressBar(widgets=widgets)
  for i in pbar((i for i in range(180))):
    time.sleep(0.05)

@example
def example18():
  widgets = [Percentage(),
        ' ', Bar(),
        ' ', ETA(),
        ' ', AdaptiveETA()]
  pbar = ProgressBar(widgets=widgets, maxval=500)
  pbar.start()
  for i in range(500):
    time.sleep(0.01 + (i < 100) * 0.01 + (i > 400) * 0.9)
    pbar.update(i + 1)
  pbar.finish()

@example
def example19():
 pbar = ProgressBar()
 for i in pbar([]):
  pass
 pbar.finish()

try:
  for example in examples:
    example()
except KeyboardInterrupt:
  sys.stdout('nQuitting examples.n')

Progress Bar 使用例子

再发一个类:

#!/usr/bin/env python
# -*- coding=utf-8 -*-
#Using GPL v2
#Author: [email protected]
#2010-10-30 13:59
"""
Usage:
Just A Template
"""
class progressbarClass: 
  def __init__(self, finalcount, progresschar=None):
    import sys
    self.finalcount=finalcount
    self.blockcount=0
    #
    # See if caller passed me a character to use on the
    # progress bar (like "*"). If not use the block
    # character that makes it look like a real progress
    # bar.
    #
    if not progresschar: self.block=chr(178)
    else:        self.block=progresschar
    #
    # Get pointer to sys.stdout so I can use the write/flush
    # methods to display the progress bar.
    #
    self.f=sys.stdout
    #
    # If the final count is zero, don't start the progress gauge
    #
    if not self.finalcount : return
    self.f.write('n------------------- % Progress -------------------n')
    return

  def progress(self, count):
    #
    # Make sure I don't try to go off the end (e.g. >100%)
    #
    count=min(count, self.finalcount)
    #
    # If finalcount is zero, I'm done
    #
    if self.finalcount:
      percentcomplete=int(round(100*count/self.finalcount))
      if percentcomplete < 1: percentcomplete=1
    else:
      percentcomplete=100

    #print "percentcomplete=",percentcomplete
    blockcount=int(percentcomplete/2)
    #print "blockcount=",blockcount
    if blockcount > self.blockcount:
      for i in range(self.blockcount,blockcount):
        self.f.write(self.block)
        self.f.flush()

    if percentcomplete == 100: self.f.write("n")
    self.blockcount=blockcount
    return

if __name__ == "__main__":
  from time import sleep
  pb=progressbarClass(8,"*")
  count=0
  while count<9:
    count+=1
    pb.progress(count)
    sleep(0.2)

另外,python cookbook中11.1节也提供了一个不错的进度条类,代码如下:

import sys
class progressbar(object):
  def __init__(self, finalcount, block_char='.'):
    self.finalcount = finalcount
    self.blockcount = 0
    self.block = block_char
    self.f = sys.stdout
    if not self.finalcount: return
    self.f.write('n------------------ % Progress -------------------1n')
    self.f.write('  1  2  3  4  5  6  7  8  9  0n')
    self.f.write('----0----0----0----0----0----0----0----0----0----0n')
  def progress(self, count):
    count = min(count, self.finalcount)
    if self.finalcount:
      percentcomplete = int(round(100.0*count/self.finalcount))
      if percentcomplete < 1: percentcomplete = 1
    else:
      percentcomplete=100
    blockcount = int(percentcomplete//2)
    if blockcount <= self.blockcount:
      return
    for i in range(self.blockcount, blockcount):
      self.f.write(self.block)
    self.f.flush()
    self.blockcount = blockcount
    if percentcomplete == 100:
      self.f.write("n")

if __name__ == "__main__":
  from time import sleep
  pb = progressbar(8, "*")
  for count in range(1, 9):
    pb.progress(count)
    sleep(0.2)
  pb = progressbar(100)
  pb.progress(20)
  sleep(0.3)
  pb.progress(47)
  sleep(0.3)
  pb.progress(90)
  sleep(0.3)
  pb.progress(100)
  print "testing 1:"
  pb = progressbar(1)
  pb.progress(1)

运行结果如下图所示:

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希望本文所述对大家Python程序设计的学习有所帮助。

复制代码

python怎在dos实现一个进度条

import os
from time import sleep
for i in range(101):
print '#'*i
sleep(0.2)
os.system('cls')

文件双击运行
不要在idle下运行  

首先,推荐一个组件:progressive 效果如下: 进度条和一般的print区别在哪里呢? 答案就是print会...

python语言下,怎实现控制台风格的进度显示?

import sys
import time

# Output example: [======= ] 75%
# width defines bar width
# percent defines current percentage

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

# Simulate doing something ...
for i in xrange(100):
progress(50, (i + 1))
time.sleep(0.1) # Slow it down for demo  

 代码如下

python语言下,怎实现控制台风格的进度显示?

import sys
import time

# Output example: [======= ] 75%
# width defines bar width
# percent defines current percentage

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

# Simulate doing something ...
for i in xrange(100):
progress(50, (i + 1))
time.sleep(0.1) # Slow it down for demo  

progressive模块的安装方法如下:

  def example1():
        widgets = ['Test: ', Percentage(), ' ', Bar(marker=RotatingMarker()),
                   ' ', ETA(), ' ', FileTransferSpeed()]
        pbar = ProgressBar(widgets=widgets, maxval=10000000).start()
        for i in range(1000000):
            # do something
            pbar.update(10*i+1)
        pbar.finish()
        print
    def example2():
        class CrazyFileTransferSpeed(FileTransferSpeed):
            "It's bigger between 45 and 80 percent"
            def update(self, pbar):
                if 45 < pbar.percentage() < 80:
                    return 'Bigger Now ' + FileTransferSpeed.update(self,pbar)
                else:
                    return FileTransferSpeed.update(self,pbar)
        widgets = [CrazyFileTransferSpeed(),' <<<', Bar(), '>>> ', Percentage(),' ', ETA()]
        pbar = ProgressBar(widgets=widgets, maxval=10000000)
        # maybe do something
        pbar.start()
        for i in range(2000000):
            # do something
            pbar.update(5*i+1)
        pbar.finish()
        print
    def example3():
        widgets = [Bar('>'), ' ', ETA(), ' ', ReverseBar('<')]
        pbar = ProgressBar(widgets=widgets, maxval=10000000).start()
        for i in range(1000000):
            # do something
            pbar.update(10*i+1)
        pbar.finish()
        print
    def example4():
        widgets = ['Test: ', Percentage(), ' ',
                   Bar(marker='0',left='[',right=']'),
                   ' ', ETA(), ' ', FileTransferSpeed()]
        pbar = ProgressBar(widgets=widgets, maxval=500)
        pbar.start()
        for i in range(100,500+1,50):
            time.sleep(0.2)
            pbar.update(i)
        pbar.finish()
        print

   

转义符\r就可以把光标移动到行首而不换行,转义符\n就把光标移动到行首并且换行。 在python中,输出stdout(标准输出)可以使用sys.stdout.write 例如:

pip install progressive

git clone https://github.com/hfaran/progressive.git
cd progressive
python setup.py install

复制代码

复制代码

python一个比较强大方便的地方,就是有各种别人做好的类库。我们只需要通过import引入即可。这里可以用下progressbar模块(目前最新版是2.3开发版),效果如下:

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2、\b转义实现法

4、progressive模块

progressive模块只适用于python2.7以上的版本。效果如下:

 代码如下

#!/usr/bin/env python
# -*- coding=utf-8 -*-
#Using GPL v2
"""
Usage:
Just A Template
"""
from __future__ import division
import sys,time
if __name__ == '__main__':
  for i in range(1,61):
    sys.stdout.write('#'+'->'+"\b\b")
    sys.stdout.flush()
    time.sleep(0.5)
print

进度条和一般的print区别在哪里呢?
答案就是print会输出一个\n,也就是换行符,这样光标移动到了下一行行首,接着输出,之前已经通过stdout输出的东西依旧保留,而且保证我们在下面看到最新的输出结果。
进度条不然,我们必须再原地输出才能保证他是一个进度条,否则换行了怎么还叫进度条?

一、进度条实现原理

二、实现方法

 代码如下

1、\r转义实现

上图中使用的是稳定版2.2的版本。四个示例的示码如下(在该模块的progressbar.py文件中可以查到):

#!/usr/bin/env python
# -*- coding=utf-8 -*-
#Using GPL v2
"""
Usage:
Just A Template
"""
from __future__ import division
import sys,time
j = '#'
if __name__ == '__main__':
  for i in range(1,61):
    j += '#'
    sys.stdout.write(str(int((i/60)*100))+'%  ||'+j+'->'+"\r")
    sys.stdout.flush()
    time.sleep(0.5)
print

3、progressbar模块实现法

第二种思路是用转义符\b 转义符\b是退格键,也就是说把输出的光标往回退格子,这样就可以不用+=了,例如:

 代码如下

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