下载Python 3的进度条
下载Python 3的进度条
提问于 2012-12-14 23:00:17
我需要在Python 3的文件下载过程中显示一个进度。我在Stackoverflow上看过一些主题，但考虑到我是编程新手，没有人发布完整的示例，只是其中的一小部分，或者我可以在Python 3上工作的示例，没有一个对我有好处……
其他信息：
好的，我有这个：
from urllib.request import urlopen
import configparser
#checks for files which need to be downloaded
print(' Downloading...')
file = urlopen(file_url)
#progress bar here
output = open('downloaded_file.py','wb')
output.write(file.read())
output.close()
os.system('downloaded_file.py')脚本通过python命令行运行
回答 2
Stack Overflow用户
回答已采纳
发布于 2012-12-16 04:06:50
有一个urlretrieve()可以将url下载到一个文件中，并允许指定一个reporthook回调来报告进度：
#!/usr/bin/env python3
import sys
from urllib.request import urlretrieve
def reporthook(blocknum, blocksize, totalsize):
readsofar = blocknum * blocksize
if totalsize > 0:
percent = readsofar * 1e2 / totalsize
s = "\r%5.1f%% %*d / %d" % (
percent, len(str(totalsize)), readsofar, totalsize)
sys.stderr.write(s)
if readsofar >= totalsize: # near the end
sys.stderr.write("\n")
else: # total size is unknown
sys.stderr.write("read %d\n" % (readsofar,))
urlretrieve(url, 'downloaded_file.py', reporthook)这是一个GUI进度条：
import sys
from threading import Event, Thread
from tkinter import Tk, ttk
from urllib.request import urlretrieve
def download(url, filename):
root = progressbar = quit_id = None
ready = Event()
def reporthook(blocknum, blocksize, totalsize):
nonlocal quit_id
if blocknum == 0: # started downloading
def guiloop():
nonlocal root, progressbar
root = Tk()
root.withdraw() # hide
progressbar = ttk.Progressbar(root, length=400)
progressbar.grid()
# show progress bar if the download takes more than .5 seconds
root.after(500, root.deiconify)
ready.set() # gui is ready
root.mainloop()
Thread(target=guiloop).start()
ready.wait(1) # wait until gui is ready
percent = blocknum * blocksize * 1e2 / totalsize # assume totalsize > 0
if quit_id is None:
root.title('%%%.0f %s' % (percent, filename,))
progressbar['value'] = percent # report progress
if percent >= 100: # finishing download
quit_id = root.after(0, root.destroy) # close GUI
return urlretrieve(url, filename, reporthook)
download(url, 'downloaded_file.py')在Python3.3上，urlretrieve()有不同的reporthook接口(see issue 16409)。要解决此问题，您可以通过FancyURLopener访问上一个界面
from urllib.request import FancyURLopener
urlretrieve = FancyURLopener().retrieve要更新同一线程中的进度条，可以内联urlretrieve()代码：
from tkinter import Tk, ttk
from urllib.request import urlopen
def download2(url, filename):
response = urlopen(url)
totalsize = int(response.headers['Content-Length']) # assume correct header
outputfile = open(filename, 'wb')
def download_chunk(readsofar=0, chunksize=1 << 13):
# report progress
percent = readsofar * 1e2 / totalsize # assume totalsize > 0
root.title('%%%.0f %s' % (percent, filename,))
progressbar['value'] = percent
# download chunk
data = response.read(chunksize)
if not data: # finished downloading
outputfile.close()
root.destroy() # close GUI
else:
outputfile.write(data) # save to filename
# schedule to download the next chunk
root.after(0, download_chunk, readsofar + len(data), chunksize)
# setup GUI to show progress
root = Tk()
root.withdraw() # hide
progressbar = ttk.Progressbar(root, length=400)
progressbar.grid()
# show progress bar if the download takes more than .5 seconds
root.after(500, root.deiconify)
root.after(0, download_chunk)
root.mainloop()
download2(url, 'downloaded_file.py')Stack Overflow用户
发布于 2012-12-15 21:55:23
我认为这段代码可以帮助你。我不太确定这是不是你想要的。至少它应该给你一些东西来工作。
import tkinter
from tkinter import ttk
from urllib.request import urlopen
def download(event):
file = urlopen('http://www.python.org/')
output = open('downloaded_file.txt', 'wb')
lines= file.readlines()
i = len(lines)
for line in lines:
output.write(line)
pbar.step(100/i)
output.close()
file.close()
root = tkinter.Tk()
root.title('Download bar')
pbar = ttk.Progressbar(root, length=300)
pbar.pack(padx=5, pady=5)
btn = tkinter.Button(root, text="Download")
# bind to left mouse button click
btn.bind("<Button-1>", download)
btn.pack(pady=10)
root.mainloop()这很管用，我已经试过了。
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原文链接：
https://stackoverflow.com/questions/13881092
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