PEP 393 deprecated some unicode APIs, and introduced wchar_t *wstr, and Py_ssize_t wstr_length in the Unicode structure to support these deprecated APIs.
In early versions of Python all namespaces, whether in functions, classes or modules, were all implemented the same way: as a dictionary.
Using a profiler or debugger in CPython can have a severe impact on performance. Slowdowns by an order of magnitude are common.
This PEP proposes enabling UTF-8 mode by default.
This PEP proposes a Python-level API for the buffer protocol, which is currently accessible only to C code. This allows type checkers to evaluate whether objects implement the protocol.
This PEP introduces the concept of type defaults for type parameters, including TypeVar, ParamSpec, and TypeVarTuple, which act as defaults for type parameters for which no type is specified.
This PEP proposes adding an @override decorator to the Python type system. This will allow type checkers to prevent a class of bugs that occur when a base class changes methods that are inherited by derived classes.
PEP 509 introduced a private ma_version_tag field for dictionaries to allow optimizations in CPython and extension libraries. This PEP proposes to rescind PEP 509 and declare the field an implementation detail, as it has already been superseded by alter...
This document proposes to lift some of the restrictions originally formulated in PEP 498 and to provide a formalized grammar for f-strings that can be integrated into the parser directly. The proposed syntactic formalization of f-strings will have some ...
Comprehensions are currently compiled as nested functions, which provides isolation of the comprehension’s iteration variable, but is inefficient at runtime. This PEP proposes to inline list, dictionary, and set comprehensions into the code where they a...
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