added docs to methods

pymc/model/core.py

@@ -1570,21 +1570,35 @@ def __getitem__(self, key):
 
     def __contains__(self, key):
         return key in self.named_vars or self.name_for(key) in self.named_vars
-    
+
     def __copy__(self):
+        """
+        Clone a pymc model by overiding the python copy method using the clone_model method from fgraph.
+        if guassian process variables are detected then an exception will be raised.
+        """
         from pymc.model.fgraph import clone_model
-        check_for_gp_vars = [k for x in ['_rotated_', '_hsgp_coeffs_'] for k in self.named_vars.keys() if x in k]
+
+        check_for_gp_vars = [
+            k for x in ["_rotated_", "_hsgp_coeffs_"] for k in self.named_vars.keys() if x in k
+        ]
         if len(check_for_gp_vars) > 0:
             raise Exception("Unable to clone Gaussian Process Variables")
-    
+
         return clone_model(self)
-    
+
     def __deepcopy__(self, _):
+        """
+        Clone a pymc model by overiding the python copy method using the clone_model method from fgraph.
+        if guassian process variables are detected then an exception will be raised.
+        """
         from pymc.model.fgraph import clone_model
-        check_for_gp_vars = [k for x in ['_rotated_', '_hsgp_coeffs_'] for k in self.named_vars.keys() if x in k]
+
+        check_for_gp_vars = [
+            k for x in ["_rotated_", "_hsgp_coeffs_"] for k in self.named_vars.keys() if x in k
+        ]
         if len(check_for_gp_vars) > 0:
             raise Exception("Unable to clone Gaussian Process Variables")
-        
+
         return clone_model(self)
 
     def replace_rvs_by_values(