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我有以下代码，它应该从 csv 文件中的给定 url 将图像下载到指定目录中。目录都设置好了。

with open('images.csv') as csv_file:
    csv_reader = csv.reader(csv_file, delimiter=',')
    next(csv_reader)
    for row in csv_reader:
        basename = os.path.basename(urlparse(row[0]).path)
        filename = '{}/{}/{}'.format(row[2], row[1], basename)
        urllib.request.urlretrieve(row[0], filename)

csv 文件按以下方式组织：

http://farm2.static.flickr.com/1245/1259825348_6a2aa94e8d.jpg,cat,train
http://farm1.static.flickr.com/146/350588612_d84d71cc59.jpg,cat,test
http://farm1.static.flickr.com/32/99029168_940da3a1e5.jpg,cat,val

但是当我执行代码时，出现以下错误。我今天才弄清楚如何使用 python 从 url 下载图像，所以我非常感谢在这件事上的所有帮助！：

---------------------------------------------------------------------------
HTTPError                                 Traceback (most recent call last)
<ipython-input-36-6e201d3625d3> in <module>
      5         basename = os.path.basename(urlparse(row[0]).path)
      6         filename = '{}/{}/{}'.format(row[2], row[1], basename)
----> 7         urllib.request.urlretrieve(row[0], filename)

~\Anaconda3\lib\urllib\request.py in urlretrieve(url, filename, reporthook, data)
    245     url_type, path = splittype(url)
    246 
--> 247     with contextlib.closing(urlopen(url, data)) as fp:
    248         headers = fp.info()
    249 

~\Anaconda3\lib\urllib\request.py in urlopen(url, data, timeout, cafile, capath, cadefault, context)
    220     else:
    221         opener = _opener
--> 222     return opener.open(url, data, timeout)
    223 
    224 def install_opener(opener):

~\Anaconda3\lib\urllib\request.py in open(self, fullurl, data, timeout)
    529         for processor in self.process_response.get(protocol, []):
    530             meth = getattr(processor, meth_name)
--> 531             response = meth(req, response)
    532 
    533         return response

~\Anaconda3\lib\urllib\request.py in http_response(self, request, response)
    639         if not (200 <= code < 300):
    640             response = self.parent.error(
--> 641                 'http', request, response, code, msg, hdrs)
    642 
    643         return response

~\Anaconda3\lib\urllib\request.py in error(self, proto, *args)
    561             http_err = 0
    562         args = (dict, proto, meth_name) + args
--> 563         result = self._call_chain(*args)
    564         if result:
    565             return result

~\Anaconda3\lib\urllib\request.py in _call_chain(self, chain, kind, meth_name, *args)
    501         for handler in handlers:
    502             func = getattr(handler, meth_name)
--> 503             result = func(*args)
    504             if result is not None:
    505                 return result

~\Anaconda3\lib\urllib\request.py in http_error_302(self, req, fp, code, msg, headers)
    753         fp.close()
    754 
--> 755         return self.parent.open(new, timeout=req.timeout)
    756 
    757     http_error_301 = http_error_303 = http_error_307 = http_error_302

~\Anaconda3\lib\urllib\request.py in open(self, fullurl, data, timeout)
    529         for processor in self.process_response.get(protocol, []):
    530             meth = getattr(processor, meth_name)
--> 531             response = meth(req, response)
    532 
    533         return response

~\Anaconda3\lib\urllib\request.py in http_response(self, request, response)
    639         if not (200 <= code < 300):
    640             response = self.parent.error(
--> 641                 'http', request, response, code, msg, hdrs)
    642 
    643         return response

~\Anaconda3\lib\urllib\request.py in error(self, proto, *args)
    567         if http_err:
    568             args = (dict, 'default', 'http_error_default') + orig_args
--> 569             return self._call_chain(*args)
    570 
    571 # XXX probably also want an abstract factory that knows when it makes

~\Anaconda3\lib\urllib\request.py in _call_chain(self, chain, kind, meth_name, *args)
    501         for handler in handlers:
    502             func = getattr(handler, meth_name)
--> 503             result = func(*args)
    504             if result is not None:
    505                 return result

~\Anaconda3\lib\urllib\request.py in http_error_default(self, req, fp, code, msg, hdrs)
    647 class HTTPDefaultErrorHandler(BaseHandler):
    648     def http_error_default(self, req, fp, code, msg, hdrs):
--> 649         raise HTTPError(req.full_url, code, msg, hdrs, fp)
    650 
    651 class HTTPRedirectHandler(BaseHandler):

HTTPError: HTTP Error 404: Not Found
4

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