Python请求:使用Multipart/form-data在Facebook上发布图像 [英] Python Request: Post Images on Facebook using Multipart/form-data

问题描述

我正在使用facebook API在页面上发布图像，我可以使用以下方法在网络上发布图像:

I'm using the facebook API to post images on a page, I can post image from web using this :

import requests

data = 'url=' + url + '&caption=' + caption + '&access_token=' + token
status = requests.post('https://graph.facebook.com/v2.7/PAGE_ID/photos',
                       data=data)
print status

但是当我要发布本地图像(使用multipart/form-data)时，出现错误: ValueError:数据不能为字符串.

But when I want to post a local image (using multipart/form-data) i get the error : ValueError: Data must not be a string.

我正在使用以下代码:

data = 'caption=' + caption + '&access_token=' + token
files = {
    'file': open(IMG_PATH, 'rb')
    }

status = requests.post('https://graph.facebook.com/v2.7/PAGE_ID/photos',
                       data=data, files=files)
print status

我阅读了( Python请求:发布JSON和单个请求中的文件)，可能无法同时发送包含多部分编码文件的数据和文件，因此我更新了代码:

I read (Python Requests: Post JSON and file in single request) that maybe it's not possible to send both data and files in a multipart encoded file so I updated my code :

data = 'caption=' + caption + '&access_token=' + token
files = {
    'data': data,
    'file': open(IMG_PATH, 'rb')
    }

status = requests.post('https://graph.facebook.com/v2.7/PAGE_ID/photos',
                       files=files)
print status

但是这似乎不起作用，我得到了与上述相同的错误.
你们知道为什么它不起作用，也许是解决此问题的方法.

But that doesn't seem to work, I get the same error as above.
Do you guys know why it's not working, and maybe a way to fix this.

推荐答案

将 data 作为字典传递:

data = {
    'caption', caption,
    'access_token', token
}
files = {
    'file': open(IMG_PATH, 'rb')
}
status = requests.post(
    'https://graph.facebook.com/v2.7/PAGE_ID/photos',
     data=data, files=files)

请求无法从 application/x-www-form-urlencoded 编码的字符串.

requests can't produce multipart/form-data parts (together with the files you are uploading) from a application/x-www-form-urlencoded encoded string.

使用字典存储POST数据还有一个额外的优点，即 requests 负责正确编码值；标题特别是可能包含必须正确转义的数据.

Using a dictionary for the POST data has the additional advantage that requests takes care of properly encoding the values; caption especially could contain data that you must escape properly.

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