class documentation
        
        Constructor: Double(default, required, required_default)
Undocumented
| Method | default | Undocumented | 
| Method | python | Undocumented | 
| Method | type | Undocumented | 
              Inherited from Field:
            
| Method | __init__ | Undocumented | 
| Method | required | Undocumented | 
| Method | schema | Undocumented | 
| Method | schema | Undocumented | 
| Method | validate | Undocumented | 
| Instance Variable | _default | Undocumented | 
| Instance Variable | _required | Undocumented | 
| Instance Variable | _required | Undocumented |