Using PUT in urllib2

resnet-test.py

#!/usr/bin/python

import urllib2
import json

apikey = ''
user = ''
baseurl = ''

query_enable = { 'is_enabled' : True }
query_disable = { 'is_enabled' : False, 'disabled_reason' : "infringement3" }
url = baseurl + user + "?key=" + apikey

json_data = json.dumps(query_disable)

opener = urllib2.build_opener(urllib2.HTTPHandler)
request = urllib2.Request(url, data=json_data)
request.add_header('Content-Type', 'application/json')
request.get_method = lambda: 'PUT'
url = opener.open(request)

print url.read()

Hello guys, could you please explain why we're using lamda here for get_method()?
Thanks!