a decorator for bottle which checks http query parameters with the applied function's argument spec

paramscheck.py

import json
from bottle import route, run, request

def params_check():
    def decorator(func):
        argnames=func.func_code.co_varnames[:func.func_code.co_argcount]
        defnames = argnames[ (len(argnames)-len( func.func_defaults )):]
        def wrapper(*args, **kwargs):
            for argname in argnames:
                if argname in request.GET:
                    kwargs[argname]=request.GET[argname]
                else:
                    if argname not in defnames:
                        return json.dumps( {'ERROR': 'You must specify {0}'.format(argname) })
            return func(*args, **kwargs)
        return wrapper
    return decorator



@route('/argtest')
@params_check()
def argtest( no, pos=0):
    return 'no={0}, pos={1}'.format( no, pos)

run(host='localhost', port=8080)

#simple test commands
#curl "http://localhost:8080/argtest"
#curl "http://localhost:8080/argtest&no=33"
#curl "http://localhost:8080/argtest&no=33&pos=3"