将POST请求从PHP转换为Python

我有这个php脚本，可以代表用户将mp3文件上传到网站。它工作正常，但我想用python编写它：

$id = $argv[1];
$file = $argv[2];
$course = $argv[3];
$audio_column_number = $argv[4];



if( !file_exists( $file ) ) {
    die();
}

$curlFile = new CURLFile( $argv[2] );
$curlFile->setPostFilename( basename( $argv[2] ) );
$curlFile->setMimeType( "audio/mpeg" );

$post = array(
    'thing_id'  => $id,
    'cell_id'   => $audio_column_number,
    'cell_type' => 'column',
    'csrfmiddlewaretoken'   => '2N829n66bh5Alhbc463wYtoqpyosyON',
    'f' => $curlFile,
);

$curl = curl_init( "http://www.memrise.com/ajax/thing/cell/upload_file/" );
curl_setopt_array( $curl, array(
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_FOLLOWLOCATION => true,
    CURLOPT_REFERER => $course,
    CURLOPT_USERAGENT => "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0",
    CURLOPT_COOKIE => "Cookie:__uvt=; __utmt=6; csrftoken=2N829n66bh5Alhbc463wYtoqpyosyON; sessionid=zj8suxtx841zlwrn10o6x3suzdjw9wpt; __utma=216705802.691983187.1416840006.1429942996.1430039373.8; __utmb=216705802.4.10.1440411307; __utmc=216705802; __utmz=216705802.1416840006.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); uvts=2Mnc8QsWzuuv8GVh",
    CURLOPT_POST => true,
    CURLOPT_POSTFIELDS => $post,
    CURLOPT_TIMEOUT => 60,
) );
$res = curl_exec( $curl );

我正在尝试将其转换为python。不过，这似乎很简单。这是我尝试过的：

import requests
import sys

files = {'f': ('f.mp3', open(sys.argv[2], 'rb'), 'audio/mp3')}
form_data = { 
    "thing_id": sys.argv[1], 
    "cell_id": sys.argv[4], 
    "cell_type": "column",
    "csrfmiddlewaretoken": "2N829n66bh5Alhbc463wYtoqpyosyON"}
cookies = {
    "__uvt":"",
    "__utmt":"6",
    "csrftoken":"2N829n66bh5Alhbc463wYtoqpyosyON",
    "sessionid":"zj8suxtx841zlwrn10o6x3suzdjw9wpt",
    "__utma":"216705802.691983187.1416840006.1429942996.1430039373.8",
    "__utmb":"216705802.4.10.1440411307",
    "__utmc":"216705802",
    "__utmz":"216705802.1416840006.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none)",
    "uvts":"2Mnc8QsWzuuv8GVh"}
headers = {
    "User-Agent": "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0",
    "referer": sys.argv[3]}
url = "http://www.memrise.com/ajax/thing/cell/upload_file/"

r = requests.post(url, files=files, cookies=cookies, headers=headers, timeout=60)
print(r.text)

与我的预期相反，虽然php脚本可以完美运行，但等效的python代码却不能。服务器拒绝它并发送403。我在PHP方面没有很多经验，但是我在理解PHP脚本方面付出了巨大的努力。我想知道是否有人可以找到Python脚本无法完成的PHP脚本在做什么。如果有帮助，我使用Chrome的开发人员工具查看在网站上载文件时网站上发帖请求的示例：

标头：

Accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Encoding:gzip, deflate
Accept-Language:en-US,en;q=0.8,fr;q=0.6,en-CA;q=0.4
Cache-Control:max-age=0
Connection:keep-alive
Content-Length:4271
Content-Type:multipart/form-data; boundary=---- WebKitFormBoundarytv2Kbmk1kUAGBVZ1
Cookie:i18next=en; sessionid=xrxg3zofonxmfmfvoe38gv56mgdefa71; fbm_143688012353890=base_domain=.www.memrise.com; csrftoken=MxIto89I10jvWe45lt5xBJ8xnQkWayh3; fbsr_143688012353890=YBKZYHGnLaxApGPYElgXzoLMgGpF10HWFPMjE4jAq60.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; _sp_id.7bc7=06d67edb75b91041.1466936153.142.1469853985.1469803261
Host:www.memrise.com
Origin:http://www.memrise.com
Referer:http://www.memrise.com/course/1160304/idioms-and-sentences/edit/database/2129600/
Upgrade-Insecure-Requests:1
User-Agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36

要求有效载荷：

------WebKitFormBoundarytv2Kbmk1kUAGBVZ1
Content-Disposition: form-data; name="thing_id"

112172106
------WebKitFormBoundarytv2Kbmk1kUAGBVZ1
Content-Disposition: form-data; name="cell_id"

4
------WebKitFormBoundarytv2Kbmk1kUAGBVZ1
Content-Disposition: form-data; name="cell_type"

column
------WebKitFormBoundarytv2Kbmk1kUAGBVZ1
Content-Disposition: form-data; name="csrfmiddlewaretoken"

MxIto89I10jvWe45lt5xBJ8xnQkWayh3
------WebKitFormBoundarytv2Kbmk1kUAGBVZ1
Content-Disposition: form-data; name="f"; filename="f.mp3"
Content-Type: audio/mp3


------WebKitFormBoundarytv2Kbmk1kUAGBVZ1--

请记住，为了保护我在其他网站上的帐户，我对Cookie进行了一些更改。

感谢您的时间。