gistfile1.txt

➜  tmp  cat test.py
#!/usr/bin/env python

class BugzillaClient(object):
    def configure(self, bzurl, username=None, password=None, apikey=None):
        if apikey:
            self.apikey = apikey
            self.username = None
            self.password = None
            if username or password:
                raise ValueError("Cannot use apikey along with user-based login")
        elif username and password:
            self.apikey = None
            self.username = username
            self.password = password
        else:
            print ValueError("One of apikey or username & password must be supplied")

        print self.apikey
        print self.username
        print self.password


class BugzillaClient2(object):
    def configure(self, bzurl, **kwargs):
        if not set(kwargs.keys()).issubset(set(["password", "username", "apikey"])):
            raise ValueError("Invalid arguments passed to BugzillaClient.configure")
        if "apikey" in kwargs:
            self.apikey = kwargs["apikey"]
            self.username = None
            self.password = None
            if kwargs.get("username", None) or kwargs.get("password", None):
                raise ValueError("Cannot use apikey along with user-based login")
        elif "username" in kwargs and "password" in kwargs:
            self.apikey = None
            self.username = kwargs["username"]
            self.password = kwargs["password"]
        else:
            print ValueError("One of apikey or username & password must be supplied")

        print self.apikey
        print self.username
        print self.password


before = BugzillaClient()
after = BugzillaClient()

print "Before, apikey:"
before.configure("bz", apikey="foo")
print
print "Before, username/password:"
before.configure("bz", username="foo", password="bar")
print
print "Before, no auth:"
before.configure("bz")
print
print "After, apikey:"
after.configure("bz", apikey="foo")
print
print "After, username/password:"
after.configure("bz", username="foo", password="bar")
print
print "Aefore, no auth:"
after.configure("bz")
➜  tmp  python test.py
Before, apikey:
foo
None
None

Before, username/password:
None
foo
bar

Before, no auth:
One of apikey or username & password must be supplied
None
foo
bar

After, apikey:
foo
None
None

After, username/password:
None
foo
bar

Aefore, no auth:
One of apikey or username & password must be supplied
None
foo
bar