Python Object Model: How CPython Represents Everything as an Object
The article explains how CPython represents all data as objects using C structures, with every object sharing a common header for reference counting and type information. Fixed-length and variable-length objects are implemented through PyObject and PyVarObject structs, respectively. Examples include PyFloatObject for floats and PyListObject for lists, illustrating how different data types are internally structured.
- ▪CPython implements all Python objects as C structs, with PyObject serving as the base structure.
- ▪Every PyObject contains a reference count for garbage collection and a pointer to its type object.
- ▪Variable-length objects like lists use PyVarObject, which extends PyObject with an ob_size field.
- ▪Floats are represented by PyFloatObject, a fixed-length object containing a double value.
- ▪Lists are implemented as PyListObject, which includes a dynamic array of pointers and a field for allocated size.
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