Python下载文件 [英] Python download a file

问题描述

我不确定该怎么做.一种方法是:

I'm unsure how to do this. One way is:

import urllib.request;
urllib.request.urlretrieve('www.example.com/file.tar', 'file.tar')

另一种方式是:

import urllib.request;

#Set as appropriate
userAgent = ....;

req = urllib.request.Request('www.example.com/file.tar', headers={'User-Agent' : userAgent});
response = urllib.request.urlopen(req);

#Save the file
f = open('file.tar', 'wb');
f.write(response.read());
f.close()

我不确定要使用哪种方法.我将循环下载许多文件(带有模式文件名).但是，我希望能够设置一个用户代理标头.这并不重要，但我想这么做.

I'm not sure which method to use. I'll be downloading many files (with a pattern filename) in a loop. However, I would like to be able to set up a user-agent header. It's not critical but I'd like to.

我忘了提到我更喜欢第一种方法，但是我不知道如何使用urlretrieve设置用户代理标头.

I forgot to mention that I prefer the first method but I don't know how to set the user-agent header with urlretrieve.

推荐答案

我正在将以注释开头的内容移至答案...

I am moving what started as comments, to an answer...

您的第二个示例几乎完成了所需的工作，即创建带有自定义标头的请求对象，然后将结果读取到本地文件中.

Your second example is pretty much doing what it needs to, in making a request object with a custom header and then reading the results into a local file.

urlretrieve是更高级别的功能，因此它仅能按照文档所说的进行操作:将网络资源下载到本地文件中，并告诉您该文件在何处.如果您不喜欢第二个示例中的较低级别方法，并且想要更多高级功能，则可以使用

urlretrieve is a higher level function so it only does exactly what the docs say: Downloads a network resource to a local file and tells you where the file is. If you don't like the slightly lower level approach of your second example and you want more higher-level functionality, you can look into using the Requests library

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