The upload method https://upgrade.odoo.com/database/v1/upload/ use this link to Upload a database dump Parameters

key (str) -- (required) your private key
request (str) -- (required) your request id
Returns
request result
Return type
json dictionary

The request id and the private key are obtained using the create method For example see code below.

import os
import pycurl
from urllib import urlencode
from io import BytesIO
import json

UPLOAD_URL = "https://upgrade.odoo.com/database/v1/upload"
DUMPFILE = "openchs.70.cdump"

fields = dict([
    ('request', '10534'),
    ('key', 'Aw7pItGVKFuZ_FOR3U8VFQ=='),
])
headers = {"Content-Type": "application/octet-stream"}
postfields = urlencode(fields)

c = pycurl.Curl()
c.setopt(pycurl.URL, UPLOAD_URL+"?"+postfields)
c.setopt(pycurl.POST, 1)
filesize = os.path.getsize(DUMPFILE)
c.setopt(pycurl.POSTFIELDSIZE, filesize)
fp = open(DUMPFILE, 'rb')
c.setopt(pycurl.READFUNCTION, fp.read)
c.setopt(
    pycurl.HTTPHEADER,
    ['%s: %s' % (k, headers[k]) for k in headers])

c.perform()
c.close()

Note-With the help of above method we can uploads a database dump.