Cleaning up slightly and adding some more methods:

User: added .get_rights() (working) and .exists() (skeleton).
Page: added .exists() (skeleton); store text as ._content; get() has a force_reload argument.
Category: fixed missing self in .get_members().
Site: self.__api -> self._api; self.__sql -> self._sql

wiki/tools/category.py

@@ -7,12 +7,12 @@ class Category(Page):
     EarwigBot's Wiki Toolset: Category Class
     """
 
-    def get_members(limit=50):
+    def get_members(self, limit=50):
         """
         Docstring needed
         """
-        params = {"action": "query", "list": "categorymembers", "cmlimit": limit}
-        params["cmtitle"] = self.title
+        params = {"action": "query", "list": "categorymembers",
+            "cmlimit": limit, "cmtitle": self.title}
         result = self.site.api_query(params)
         members = result['query']['categorymembers']
         return [member["title"] for member in members]

wiki/tools/page.py

@@ -11,14 +11,23 @@ class Page(object):
         """
         self.site = site
         self.title = title
+        self._content = None
 
-    def get(self):
+    def exists(self):
         """
         Docstring needed
         """
-        params = {'action': 'query', 'prop': 'revisions', 'rvprop':'content', 'rvlimit':'1'}
-        params["titles"] = self.title
-        result = self.site.api_query(params)
-        pageid = result['query']['pages'].keys()[0]
-        content = result['query']['pages'][pageid]['revisions'][0]['*']
-        return content
+        pass
+
+    def get(self, force_reload=False):
+        """
+        Docstring needed
+        """
+        if content is None or force_reload:
+            params = {"action": "query", "prop": "revisions",
+                "rvprop": "content", "rvlimit": 1, "titles": self.title}
+            result = self.site.api_query(params)
+            content = result["query"]["pages"].values()[0]["revisions"][0]["*"]
+            self._content = content
+            return content
+        return self._content

wiki/tools/site.py

@@ -20,8 +20,8 @@ class Site(object):
         self.name = name
         self.project = project
         self.lang = lang
-        self.__api = api
-        self.__sql = sql
+        self._api = api
+        self._sql = sql
 
     def api_query(self, params):
         """
@@ -29,7 +29,7 @@ class Site(object):
         """
         params["format"] = "json"
         data = urlencode(params)
-        result = urlopen(self.__api, data).read()
+        result = urlopen(self._api, data).read()
         return loads(result)
 
     def get_page(self, pagename):

wiki/tools/user.py

@@ -5,5 +5,28 @@ class User(object):
     EarwigBot's Wiki Toolset: User Class
     """
 
-    def __init__(self):
+    def __init__(self, site, username):
+        """
+        Docstring needed
+        """
+        self.site = site
+        self.username = username
+
+    def exists(self):
+        """
+        Docstring needed
+        """
         pass
+
+    def get_rights(self):
+        """
+        Docstring needed
+        """
+        params = {"action": "query", "list": "users", "usprop": "groups",
+            "ususers": self.username}
+        result = self.site.api_query(params)
+        try:
+            rights = res['query']['users'][0]['groups']
+        except KeyError:  # 'groups' not found, meaning the user does not exist
+            return None
+        return rights