**kwargs vs 10 arguments in a python function?

I am starting out with python and trying to construct an XML request for an ebay web service:

Now, my question is:

Say, this is my function:

def findBestMatchItemDetailsAcrossStores():
     request = """<?xml version="1.0" encoding="utf-8"?>
     <findBestMatchItemDetailsAcrossStoresRequest xmlns="http://www.ebay.com/marketplace/search/v1/services">
     <siteResultsPerPage>50</siteResultsPerPage>
     <entriesPerPage>50</entriesPerPage>
     <ignoreFeatured>true</ignoreFeatured>
     <keywords>ipod</keywords> <-----REQUIRED
     <itemFilter>
     <paramName>PriceMin</paramName>
     <paramValue>50</paramValue>
     <name>Currency</name>
     <value>USD</value>
     </itemFilter>
     <itemFilter>
     <paramName>PriceMax</paramName>
     <paramValue>100</paramValue>
     </itemFilter>
     </findBestMatchItemDetailsAcrossStoresRequest>"""
     return get_response(findBestMatchItemDetailsAcrossStores.__name__, request)

Where, keyword is the only required field. So, how should I construct the method? The ways can be:

1. Create an object, pass it to the func(object) : The java way
2. Pass all the arguments: func(a=val1, b=val2, c=val3, d=val4 etc)
3. Use **kwargs and trust the person who calls the function, that he 开发者_JAVA百科passes the right keys with the values, because I will use the keys to actually construct the XML tags.

Update:

All the xml tags you see in the request are needed to be passed by the user. But keywords should be passed and others maybe passed if required.

Any suggestions?

A good idea is to put all the parameters with appropriate defaults (or just None defaults) in the function signature. Yeah, it will require a little more typing in the function itself, but the interface will be clean, self-documented and simple to use, as you won't have to look up possible parameters in ebay docs or function source. It will save you time later on.

how about modeling the message as a class?

class FindBestMatchItemDetailsAcrossStoresRequest:
     def __init__(self,keywords):
         self.keywords = keywords # required parameters in the constructor
         # set up the default values....etc
         self.siteResultsPerPage = 50 
         self.name = 'Currency'


     def send(self):
         # build message from self.xxx
         return get_response()


 #usage
 req = FindBestMatchItemDetailsAcrossStoresRequest('ipod')
 response = req.send()

 #usage with optional args

 req.siteResultsPerPage = 150
 response = req.send()

I would use named parameters for all. By doing this it is very easy to assign default values, and to force the user to supply required parameters (by omitting the default)