如何取消设置协议缓冲区字段？

Question

How would you unset a protocol buffer variable.

Given this .proto :

message Product {
    optional float price = 5;
}

If one tries deleting the item:

del product.price

this results:

AttributeError: can't delete attribute

If one tries setting the variable to None :

product.price = None

this results:

TypeError: Cannot set mypackage.Product.price_was to None: None has type <class 'NoneType'>, but expected one of: numbers.Real

Answer 1

You can use ClearField like

product.ClearField('price')

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