multipartのrequestsについてなのです

POST /v2/users/create HTTP/1.1
Host: mixch.tv
Connection: keep-alive
X-Mixch-Country: jp
X-Mixch-Attribution: Organic
Accept: */*
X-Mixch-AdvertisingId: A29428C7-8C02-419F-A071-E47E3DA184A9
User-Agent: mixch/5.2.1 (iPhone; iOS 10.2; Scale/2.00)
Accept-Language: ja-JP;q=1
Accept-Encoding: gzip, deflate
Content-Length: 262033
Content-Type: multipart/form-data; boundary=Boundary+EF9D031E6AE26D0E

--Boundary+EF9D031E6AE26D0E
Content-Disposition: form-data; name="birth_year"

-1
--Boundary+EF9D031E6AE26D0E
Content-Disposition: form-data; name="nickname"

Hi
--Boundary+EF9D031E6AE26D0E
Content-Disposition: form-data; name="prefecture"

-1
--Boundary+EF9D031E6AE26D0E
Content-Disposition: form-data; name="file"; filename="file.png"
Content-Type: image/jpeg

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これのmultipartのリクエストの送信の仕方を教えてください...
Python2でお願いします。