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Diffstat (limited to 'Doc/library/intro.rst')
-rw-r--r-- | Doc/library/intro.rst | 43 |
1 files changed, 42 insertions, 1 deletions
diff --git a/Doc/library/intro.rst b/Doc/library/intro.rst index 5a4c9b8..ffc8939 100644 --- a/Doc/library/intro.rst +++ b/Doc/library/intro.rst @@ -58,7 +58,7 @@ Notes on availability operating system. * If not separately noted, all functions that claim "Availability: Unix" are - supported on macOS, which builds on a Unix core. + supported on macOS and iOS, both of which build on a Unix core. * If an availability note contains both a minimum Kernel version and a minimum libc version, then both conditions must hold. For example a feature with note @@ -119,3 +119,44 @@ DOM APIs as well as limited networking capabilities with JavaScript's .. _wasmtime: https://wasmtime.dev/ .. _Pyodide: https://pyodide.org/ .. _PyScript: https://pyscript.net/ + +.. _iOS-availability: + +iOS +--- + +iOS is, in most respects, a POSIX operating system. File I/O, socket handling, +and threading all behave as they would on any POSIX operating system. However, +there are several major differences between iOS and other POSIX systems. + +* iOS can only use Python in "embedded" mode. There is no Python REPL, and no + ability to execute binaries that are part of the normal Python developer + experience, such as :program:`pip`. To add Python code to your iOS app, you must use + the :ref:`Python embedding API <embedding>` to add a Python interpreter to an + iOS app created with Xcode. See the :ref:`iOS usage guide <using-ios>` for + more details. + +* An iOS app cannot use any form of subprocessing, background processing, or + inter-process communication. If an iOS app attempts to create a subprocess, + the process creating the subprocess will either lock up, or crash. An iOS app + has no visibility of other applications that are running, nor any ability to + communicate with other running applications, outside of the iOS-specific APIs + that exist for this purpose. + +* iOS apps have limited access to modify system resources (such as the system + clock). These resources will often be *readable*, but attempts to modify + those resources will usually fail. + +* iOS apps have a limited concept of console input and output. ``stdout`` and + ``stderr`` *exist*, and content written to ``stdout`` and ``stderr`` will be + visible in logs when running in Xcode, but this content *won't* be recorded + in the system log. If a user who has installed your app provides their app + logs as a diagnostic aid, they will not include any detail written to + ``stdout`` or ``stderr``. + + iOS apps have no concept of ``stdin`` at all. While iOS apps can have a + keyboard, this is a software feature, not something that is attached to + ``stdin``. + + As a result, Python library that involve console manipulation (such as + :mod:`curses` and :mod:`readline`) are not available on iOS. |