a_marshmallow_schemas.py

# Here we define all possible parameter combinations.
# We also add a little bit of validation (which fields 
# are required, what are the default values).

from marshmallow import Schema, fields

class PMargharitaSchema(Schema):
  with_bazil = fields.Boolean(missing=True)
  
  
class PPestoSchema(Schema):
  cheeze_type = fields.Str(
    required=True,
    validate=validate.OneOf(("mozzarella", "mixed"))
  )
  with_arugula = fields.Boolean(missing=True)
  
  ...

b_pizza_maker.py

class PizzaMaker:
  # we can promote "ptype" to outsize of "pizza_properties"
  def create_pizza(self, ptype, **pizza_properties):
    
    # we have to get the correct shema class
    props_schema = resolve_schema_from(ptype)
    if props_schema is None:
      raise TypError(....)
      
    # validate parameters: this will raise 
    # marshmallow.ValidationError if something is invalid
    valid_props = props_schema.load(pizza_properties)
    
    pizza_class = get_pizza_class(ptype)
    if pizza_class is None:
      raise UnknownPizaType(ptype)
      
    pizza = pizza_class(**valid_props)
    
    return pizza