The Simple Repository API that was defined in PEP and was in use much longer than that has served us reasonably well for a very long time However the reliance on using HTML as the data exchange mechanism has several shortcomings

   This PEP proposes a feature to transparently defer the execution of imported modules until the moment when an imported object is used Since Python programs commonly import many more modules than a single invocation of the program is likely to use in practice lazy imports can greatly reduce the

   This PEP proposes a mechanism for Python code to inspect whether a type supports the C level buffer protocol This allows type checkers to evaluate whether objects implement the protocol

   Some functions and types of the C API are designated unstable meaning that they will not change in patch bugfix security releases but may change between minor releases e g between and without deprecation warnings

   Extensions in the standard library will be converted to multi phase initialization PEP and where possible all state will be stored on module objects rather than in process global variables

   This PEP proposes enabling UTF mode by default

   This PEP specifies how to normalize distribution extra names when performing comparisons This prevents tools from either failing to find an extra name or accidentally matching against an unexpected name

   Since Python CPython users can run multiple interpreters in the same process However interpreters in the same process have always shared a significant amount of global state This is a source of bugs with a growing impact as more and more people use the feature Furthermore

   Currently the CPython runtime maintains a small amount of mutable state in the allocated memory of each object Because of this otherwise immutable objects are actually mutable This can have a large negative impact on CPU and memory performance especially for approaches to increasing Python s

   Though float and Decimal types can represent signed zero in many fields of mathematics negative zero is surprising or unwanted especially in the context of displaying an often rounded numerical result This PEP proposes an extension to the string format specification allowing negative zero