我正在尝试使用urllib2 http客户端在python中创建下载进度条。我查看了API(以及谷歌),似乎urllib2不允许您注册进度挂钩。然而,旧的废弃的urllib确实具有此功能。
有人知道如何使用urllib2创建进度条或报告挂钩吗?还是有其他方法来获得类似的功能?
我正在尝试使用urllib2 http客户端在python中创建下载进度条。我查看了API(以及谷歌),似乎urllib2不允许您注册进度挂钩。然而,旧的废弃的urllib确实具有此功能。
有人知道如何使用urllib2创建进度条或报告挂钩吗?还是有其他方法来获得类似的功能?
这里是一个完全可用的示例,基于Anurag的响应分块方法。我的版本允许您设置块大小,并附加任意报告函数:
import urllib2, sys
def chunk_report(bytes_so_far, chunk_size, total_size):
percent = float(bytes_so_far) / total_size
percent = round(percent*100, 2)
sys.stdout.write("Downloaded %d of %d bytes (%0.2f%%)\r" %
(bytes_so_far, total_size, percent))
if bytes_so_far >= total_size:
sys.stdout.write('\n')
def chunk_read(response, chunk_size=8192, report_hook=None):
total_size = response.info().getheader('Content-Length').strip()
total_size = int(total_size)
bytes_so_far = 0
while 1:
chunk = response.read(chunk_size)
bytes_so_far += len(chunk)
if not chunk:
break
if report_hook:
report_hook(bytes_so_far, chunk_size, total_size)
return bytes_so_far
if __name__ == '__main__':
response = urllib2.urlopen('http://www.ebay.com');
chunk_read(response, report_hook=chunk_report)
为什么不只是按块读取数据,并在其中执行您想要执行的任何操作,例如在线程中运行、连接到用户界面等等?
import urllib2
urlfile = urllib2.urlopen("http://www.google.com")
data_list = []
chunk = 4096
while 1:
data = urlfile.read(chunk)
if not data:
print "done."
break
data_list.append(data)
print "Read %s bytes"%len(data)
输出:
Read 4096 bytes
Read 3113 bytes
done.
temp_filename = "/tmp/" + file_url.split('/')[-1]
f = open(temp_filename, 'wb')
remote_file = urllib2.urlopen(file_url)
try:
total_size = remote_file.info().getheader('Content-Length').strip()
header = True
except AttributeError:
header = False # a response doesn't always include the "Content-Length" header
if header:
total_size = int(total_size)
bytes_so_far = 0
while True:
buffer = remote_file.read(8192)
if not buffer:
sys.stdout.write('\n')
break
bytes_so_far += len(buffer)
f.write(buffer)
if not header:
total_size = bytes_so_far # unknown size
percent = float(bytes_so_far) / total_size
percent = round(percent*100, 2)
sys.stdout.write("Downloaded %d of %d bytes (%0.2f%%)\r" % (bytes_so_far, total_size, percent))
对 Triptych 的回答进行小修改,以便实际写出文件(Python3):
from urllib.request import urlopen
def chunk_report(bytes_so_far, chunk_size, total_size):
percent = float(bytes_so_far) / total_size
percent = round(percent*100, 2)
sys.stdout.write("Downloaded %d of %d bytes (%0.2f%%)\r" %
(bytes_so_far, total_size, percent))
if bytes_so_far >= total_size:
sys.stdout.write('\n')
def chunk_read(response, chunk_size=8192, report_hook=None):
total_size = response.info().get("Content-Length").strip()
total_size = int(total_size)
bytes_so_far = 0
data = b""
while 1:
chunk = response.read(chunk_size)
bytes_so_far += len(chunk)
if not chunk:
break
if report_hook:
report_hook(bytes_so_far, chunk_size, total_size)
data += chunk
return data
使用方法:
with open(out_path, "wb") as f:
response = urlopen(filepath)
data_read = chunk_read(response, report_hook=chunk_report)
f.write(data_read)
file = open('myfile.html', 'wb')
,然后执行file.write(response.read())
。 - styfleresponse.read()
则会毁掉定期进度报告的全部意义。 - MestreLion