Update 'PYGUIDE.md'

PYGUIDE.md

@@ -94,3 +94,54 @@ always access your variable throught the method and avoid to access directly.
     return self.object_attribute * 2
 
 ``` 
+
+Attributes with known units should be explicit in method's names
+
+```python
+
+  @property
+  def distance_m(self):    
+    return self._distance    
+``` 
+
+### Coments
+
+#### code documentation 
+
+all public classes, properties and methods must have code comments
+
+```python
+
+  class MyClass
+  """
+  MyClass class perform models class operations
+  """
+  
+  def __init__(self):
+  
+  
+  @property
+  def object_attribute(self):   
+    """
+    My class object attribute
+    :return: int
+    """
+    return self._object_attribute       
+    
+  def operation(self, first_param, second_param):
+    """
+    multiplies object_attribute by two
+    :return: int
+    """
+    return self.object_attribute * 2
+
+``` 
+
+#### To do's
+
+Pending to implement operations should be indicated with ToDo comments to highlight the missing operation
+
+```python
+  # ToDo: right now extracted at city level, in the future should be extracted also at building level if exist
+```
+