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Ever needed a global object that act as None but not quite? Like for example keyword argument for function, where None make sense, so you need a default value. One solution is to create as singleton object: mysingleton = object() Though it becomes difficult to track the singleton across libraries, and teach users where to import this from. It's also relatively annoying use this singleton across library. Introducing undefined: >>> import undefined >>> from undefined import Undefined >>> undefined is Undefined True
16 lines
522 B
Text
16 lines
522 B
Text
Ever needed a global object that act as None but not quite? Like for example
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keyword argument for function, where None make sense, so you need a default
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value.
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One solution is to create as singleton object:
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mysingleton = object()
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Though it becomes difficult to track the singleton across libraries, and teach
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users where to import this from. It's also relatively annoying use this
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singleton across library.
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Introducing undefined:
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>>> import undefined
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>>> from undefined import Undefined
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>>> undefined is Undefined
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True
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