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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def cast(self, value, custom_formatters=None, strict=True):
 """Cast value to schema type"""

        if value is None:
            if not self.nullable:
                raise InvalidSchemaValue("Null value for non-nullable schema", value, self.type)
            return self.default

        cast_mapping = self.get_cast_mapping(
            custom_formatters=custom_formatters, strict=strict)

        if self.type is not SchemaType.STRING and value == '':
            return None

        cast_callable = cast_mapping[self.type]
        try:
            return cast_callable(value)
        except ValueError:
            raise InvalidSchemaValue(
                "Failed to cast value {value} to type {type}", value, self.type)