Question

我正试图用<代码>多部分_encode上载一个文件,以实现<代码>MIME程序。然而,我遇到了以下错误:<代码>。 AttributeError: multipart_yielder instance has no Depende __len__ 。下面是我的做法,我确实赞赏大家能向我提出一些建议。

url = "https://pi-user-files.s3-external-1.amazonaws.com/"           
post_data = {}
#data is a dict
post_data[ AWSAccessKeyId ]=(data[ ticket ][ AWSAccessKeyId ])
post_data[ success_action_redirect ]=(data[ ticket ][ success_action_redirect ])
post_data[ acl ]=(data[ ticket ][ acl ])
post_data[ key ]=(data[ ticket ][ key ])
post_data[ signature ]=(data[ ticket ][ signature ])
post_data[ policy ]=(data[ ticket ][ policy ])
post_data[ Content-Type ]=(data[ ticket ][ Content-Type ])

#I would like to upload a text file "new 2"
post_data[ file ]=open("new  2.txt", "rb")

datagen, headers = multipart_encode(post_data)
request2 = urllib2.Request(url, datagen, headers)
result = urllib2.urlopen(request2)

Answer 1

问题在于,在httplib.py中,没有发现发电机,而是将发电机视为带有所发送全部数据(因此它试图找到其长度):

if hasattr(data, read ) and not isinstance(data, array): # generator 
    if self.debuglevel > 0: print "sendIng a read()able"
    ....

解决办法是使发电机能够像(a)一样发挥作用:

class GeneratorToReadable():
    def __init__(self, datagen):
        self.generator = datagen
        self._end = False
        self.data =   

    def read(self, n_bytes):
        while not self._end and len(self.data) < n_bytes:
            try:
                next_chunk = self.generator.next()
                if next_chunk:
                    self.data += next_chunk
                else:
                    self._end = True
            except StopIteration:
                self._end = True
        result = self.data[0:n_bytes]
        self.data = self.data[n_bytes:]
        return result

并使用:

datagen, headers = multipart_encode(post_data)
readable = GeneratorToReadable(datagen)
req = urllib2.Request(url, readable, headers)
result = urllib2.urlopen(req)

Answer 2

如果您要寄送文件,请填写MultipartParam物体的其他参数,例如制作发送档案申请的代码:

from poster.encode import multipart_encode, MultipartParam
import urllib2

def postFileRequest(url, paramName, fileObj, additionalHeaders={}, additionalParams={}):
    items = []
    #wrap post parameters
    for name, value in additionalParams.items():
        items.append(MultipartParam(name, value))
    #add file
    items.append(MultipartParam.from_file(paramName, fileObj))
    datagen, headers = multipart_encode(items)
    #add headers
    for item, value in additionalHeaders.iteritems():
        headers[item] = value
    return urllib2.Request(url, datagen, headers)

我还认为,你从一开始就应执行<条码>登记——开放者。 http://atlee.ca/software/poster/“rel=“nofollow”

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