How CPython Implements dict in C
Python’s dict is a hash table with a twist: since 3.6 it is compact and preserves insertion order, and since 3.3 a single keys object can be shared by many instances of the same …
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How CPython Implements Ellipsis in C
Python’s Ellipsis is the object spelled .... It is a singleton: there is exactly one instance, and type(Ellipsis) is types.EllipsisType. In CPython it lives in …
How CPython Implements enumerate (and zip/reversed) in C
Python’s enumerate, zip, and reversed are not functions that build lists. They are lazy iterator objects implemented in C. enumerate lives in Objects/enumobject.c alongside …
How CPython Implements Exceptions in C
Python exceptions are ordinary objects. In CPython every exception instance is a PyBaseExceptionObject (or a subclass struct that starts with the same PyException_HEAD), allocated …
How CPython Implements float in C
Python’s float is a thin wrapper around a C double. In CPython that is implemented by PyFloatObject in Objects/floatobject.c, and almost every operation reduces to doing C double …