import xmltodict

s = { 'name': 'GOOG', 'shares': 100, 'price':490.1 }

print(xmltodict.unparse(s, full_document=False))

<name>GOOG</name><shares>100</shares><price>490.1</price>

import requests
url="http://wsf.cdyne.com/WeatherWS/Weather.asmx?WSDL"
#headers = {'content-type': 'application/soap+xml'}
headers = {'content-type': 'text/xml'}
body = """<?xml version="1.0" encoding="UTF-8"?>
			 <SOAP-ENV:Envelope xmlns:ns0="http://ws.cdyne.com/WeatherWS/" xmlns:ns1="http://schemas.xmlsoap.org/soap/envelope/" 
			 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
			 	<SOAP-ENV:Header/>
			 	  <ns1:Body><ns0:GetWeatherInformation/></ns1:Body>
			 </SOAP-ENV:Envelope>"""

response = requests.post(url,data=body,headers=headers)
print response.content

参考
https://gist.github.com/toast38coza/17e2ad6c2cfa2e96b0b1