Class Python Default Values !!

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default values in class definition and constructor is this the.

with dataclasses a feature added in python 3 7 there is now yet another quite convenient way to achieve setting default values on class instances the decorator dataclass will automatically generate a few methods on your class such as the constructor.

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29 11 2020 using class members to give default values works very well just so long as you are careful only to do it with immutable values if you try to do it with a list or a dict that would be pretty deadly it also works where the instance attribute is a reference to a class just so long as the default value is none.

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14 07 2021 python stores default member variable values in class attributes consider this example not using dataclasses class c x def add self element self x append element o1 c o2 c o1 add 1 o2 add 2 assert o1 x 1 2 assert o1 x is o2 x.

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01 07 2021 python has a different way of representing syntax and default values for function arguments default values indicate that the function argument will take that value if no argument value is passed during the function call the default value is assigned by using the assignment operator of the form keywordname value.

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i m wondering if this is the right way to do this it seems odd somehow to assign default values in the class definition then default none in the constructor i suppose i could give the same default values in both places but again this feels like unnecessarily repeating myself.

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however this is not valid python if a parameter has a default value all following parameters must also have a default value in other words if a field in a base class has a default value then all new fields added in a subclass must have default values as well another thing to be aware of is how fields are ordered in a subclass.
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