本文目錄一覽:
- 1、python和selenium怎麼判斷進度條
- 2、python怎麼查看進度
- 3、python語言下,如何實現控制颱風格的進度顯示?
- 4、Python加載進度條\r為什麼不起作用?
- 5、python中怎麼用控制台使用方法
- 6、Python實現多進程+進度條顯示
python和selenium怎麼判斷進度條
phython:
首先利用pip快速安裝第三方庫,tqdm
使用tqdm的函數之前需要導入qdm庫
在tqdm的應用中,直接在for結構上,添加一個tdqm()即可。
執行上一步的操作,就可以觀察到進度條。
selenium:
拿到瀏覽器滾動條的js代碼,然後執行,就可以看到進度條
.通過模擬鍵盤的形式去滾動屏幕,就可以看到進度條
其中通過 driver.execute_script()執行js代碼時,可以用兩個語法,語法:scrollBy(x,y)和語法:scrollBy(x,y
python怎麼查看進度
進度條類,代碼如下:
import sysclass 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 ——————-1\n’)
self.f.write(‘ 1 2 3 4 5 6 7 8 9 0\n’)
self.f.write(‘—-0—-0—-0—-0—-0—-0—-0—-0—-0—-0\n’) 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)
運行結果如下:
python語言下,如何實現控制颱風格的進度顯示?
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:
sys.stdout.flush()
# Simulate doing something …
for i in xrange(100):
progress(50, (i + 1))
time.sleep(0.1) # Slow it down for demo
Python加載進度條\r為什麼不起作用?
IDLE不是控制台,不能處理控制字符。
在控制台中運行你的程序。
python中怎麼用控制台使用方法
本文實例講述了Python顯示進度條的方法,是Python程序設計中非常實用的技巧。分享給大家供大家參考。具體方法如下:
首先,進度條和一般的print區別在哪裡呢?
答案就是print會輸出一個\n,也就是換行符,這樣光標移動到了下一行行首,接着輸出,之前已經通過stdout輸出的東西依舊保留,而且保證我們在下面看到最新的輸出結果。
進度條不然,我們必須再原地輸出才能保證他是一個進度條,否則換行了怎麼還叫進度條?
最簡單的辦法就是,再輸出完畢後,把光標移動到行首,繼續在那裡輸出更長的進度條即可實現,新的更長的進度條把舊的短覆蓋,就形成了動畫效果。
可以想到那個轉義符了吧,那就是\ r。
轉義符r就可以把光標移動到行首而不換行,轉義符n就把光標移動到行首並且換行。
在python中,輸出stdout(標準輸出)可以使用sys.stdout.write
例如:
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#!/usr/bin/env python
# -*- coding=utf-8 -*-
#Using GPL v2
#Author: ihipop@gmail.com
##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)
第二種思路是用轉義符\b
轉義符\b是退格鍵,也就是說把輸出的光標往回退格子,這樣就可以不用+=了,例如:
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#!/usr/bin/env python
# -*- coding=utf-8 -*-
#Using GPL v2
#Author: ihipop@gmail.com
#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(‘#’+’-‘+”\b\b”)
sys.stdout.flush()
time.sleep(0.5)
光標回退2格,寫個#再回退,再寫,達到增長的目的了
不過寫這麼多似乎是廢話,在耳邊常常聽到一句話:那就是不要重複造輪子。實際上python有豐富發lib幫你實現這個東西,你完全可以把心思放在邏輯開發上而不用注意這些小細節
下面要介紹的就是這個類“progressbar”,使用easy_install可以方便的安裝這個類庫,其實就一個文件,拿過來放到文件同一個目錄下面也直接可以import過來
如下圖所示:
下面就是基本使用舉例:
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#!/usr/bin/env python
# -*- coding=utf-8 -*-
#Using GPL v2
#Author: ihipop@gmail.com
#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()
#高級用法
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()
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# 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: %s\n’ % name)
fn()
sys.stdout.write(‘\n’)
except KeyboardInterrupt:
sys.stdout.write(‘\nSkipping example.\n\n’)
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=’.oOa href=””@*/a ‘)]
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’)
Python實現多進程+進度條顯示
之前在寫繁體字轉簡體字的時候,由於數據量比較大,所以用了多進程來實現。其實我對多進程/多線程的認識只是了解概念,第一次看到實際的應用是在BDCI-OCR的項目中,作者用多進程進行圖像處理。毫無疑問,並行計算能顯著地減少運行時間。
那麼為什麼用多進程實現並行計算(多核任務),不用多線程呢?
引用鏈接
網上有很多實現多進程的示例,我只記錄自己用過的。
這裡我用的是pool.apply_async(),是異步非阻塞的方法,可以理解為:不用等待當前進程執行完畢,隨時根據系統調度來進行進程切換。當然,還有其他方法,網上有很多資料,我就不贅述了。
從運行結果中可以發現:因為cpu最大核心數是8,所以前8個任務的進程id都不一樣,任務9的進程id與任務2的相同,即任務2執行結束後再執行任務9,依此類推。
模擬的事件:共需處理10個任務,每個任務執行時間為5秒(5 * time.sleep(1))
參考鏈接
發現:因為我的cpu是8核,所以10個任務的多進程耗時約為 2×單任務耗時 。
在查閱相關資料時發現,多進程在實際使用的時候有 單參數 和 多參數 之分,那麼多參數和單參數的優缺點分別是什麼呢?
原創文章,作者:小藍,如若轉載,請註明出處:https://www.506064.com/zh-hant/n/157763.html