code: def schema_delete_field(cls, key):
          
          root = '/'.join([API_ROOT, 'schemas', cls.__name__])
          payload = {
              'className': cls.__name__,
              'fields': {
                  key: {
                      '__op': 'Delete'
                  }
              }
          }
          cls.PUT(root, **payload)
docs: Deletes a field.