You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
108 lines
11 KiB
108 lines
11 KiB
.. _python_37:
|
|
|
|
Python 3.7
|
|
==========
|
|
|
|
New Features:
|
|
|
|
.. table::
|
|
:widths: 20 60 20
|
|
|
|
+--------------------------------------------------------+--------------------------------------------------+--------------------------------------+
|
|
| **Feature** | **Status** |
|
|
+--------------------------------------------------------+--------------------------------------------------+--------------------------------------+
|
|
| `PEP 538 <https://www.python.org/dev/peps/pep-0538/>`_ | Coercing the legacy C locale to a UTF-8 based | |
|
|
| | locale | |
|
|
+--------------------------------------------------------+--------------------------------------------------+--------------------------------------+
|
|
| `PEP 539 <https://www.python.org/dev/peps/pep-0539/>`_ | A New C-API for Thread-Local Storage in CPython | |
|
|
+--------------------------------------------------------+--------------------------------------------------+--------------------------------------+
|
|
| `PEP 540 <https://www.python.org/dev/peps/pep-0540/>`_ | UTF-8 mode | |
|
|
+--------------------------------------------------------+--------------------------------------------------+--------------------------------------+
|
|
| `PEP 552 <https://www.python.org/dev/peps/pep-0552/>`_ | Deterministic pyc | |
|
|
+--------------------------------------------------------+--------------------------------------------------+--------------------------------------+
|
|
| `PEP 553 <https://www.python.org/dev/peps/pep-0553/>`_ | Built-in ``breakpoint()`` | |
|
|
+--------------------------------------------------------+--------------------------------------------------+--------------------------------------+
|
|
| `PEP 557 <https://www.python.org/dev/peps/pep-0557/>`_ | Data Classes | |
|
|
+--------------------------------------------------------+--------------------------------------------------+--------------------------------------+
|
|
| `PEP 560 <https://www.python.org/dev/peps/pep-0560/>`_ | Core support for typing module and generic types | |
|
|
+--------------------------------------------------------+--------------------------------------------------+--------------------------------------+
|
|
| `PEP 562 <https://www.python.org/dev/peps/pep-0562/>`_ | Module ``__getattr__`` and ``__dir__`` | Partial |
|
|
+--------------------------------------------------------+--------------------------------------------------+--------------------------------------+
|
|
| `PEP 563 <https://www.python.org/dev/peps/pep-0563/>`_ | Postponed Evaluation of Annotations | |
|
|
+--------------------------------------------------------+--------------------------------------------------+--------------------------------------+
|
|
| `PEP 564 <https://www.python.org/dev/peps/pep-0564/>`_ | Time functions with nanosecond resolution | Partial [#ftimenanosec]_ |
|
|
+--------------------------------------------------------+--------------------------------------------------+--------------------------------------+
|
|
| `PEP 565 <https://www.python.org/dev/peps/pep-0565/>`_ | Show DeprecationWarning in ``__main__`` | |
|
|
+--------------------------------------------------------+--------------------------------------------------+--------------------------------------+
|
|
| `PEP 567 <https://www.python.org/dev/peps/pep-0567/>`_ | Context Variables | |
|
|
+--------------------------------------------------------+--------------------------------------------------+--------------------------------------+
|
|
|
|
Other Language Changes:
|
|
|
|
.. table::
|
|
:widths: 90 10
|
|
|
|
+-----------------------------------------------------------------------------------------------------------------+----------------+
|
|
| ``async`` and ``await`` are now reserved keywords | Complete |
|
|
+-----------------------------------------------------------------------------------------------------------------+----------------+
|
|
| ``dict`` objects must preserve insertion-order | |
|
|
+-----------------------------------------------------------------------------------------------------------------+----------------+
|
|
| More than 255 arguments can now be passed to a function; a function can now have more than 255 parameters | |
|
|
+-----------------------------------------------------------------------------------------------------------------+----------------+
|
|
| ``bytes.fromhex()`` and ``bytearray.fromhex()`` now ignore all ASCII whitespace, not only spaces | |
|
|
+-----------------------------------------------------------------------------------------------------------------+----------------+
|
|
| ``str``, ``bytes``, and ``bytearray`` gained support for the new ``isascii()`` method, which can be used to | |
|
|
| test if a string or bytes contain only the ASCII characters | |
|
|
+-----------------------------------------------------------------------------------------------------------------+----------------+
|
|
| ``ImportError`` now displays module name and module ``__file__`` path when ``from ... import ...`` fails | |
|
|
+-----------------------------------------------------------------------------------------------------------------+----------------+
|
|
| Circular imports involving absolute imports with binding a submodule to a name are now supported | |
|
|
+-----------------------------------------------------------------------------------------------------------------+----------------+
|
|
| ``object.__format__(x, '')`` is now equivalent to ``str(x)`` rather than ``format(str(self), '')`` | |
|
|
+-----------------------------------------------------------------------------------------------------------------+----------------+
|
|
| In order to better support dynamic creation of stack traces, ``types.TracebackType`` can now be | |
|
|
| instantiated from Python code, and the ``tb_next`` attribute on tracebacks is now writable | |
|
|
+-----------------------------------------------------------------------------------------------------------------+----------------+
|
|
| When using the ``-m`` switch, ``sys.path[0]`` is now eagerly expanded to the full starting directory path, | |
|
|
| rather than being left as the empty directory (which allows imports from the current working directory | |
|
|
| at the time when an import occurs) | |
|
|
+-----------------------------------------------------------------------------------------------------------------+----------------+
|
|
| The new ``-X importtime`` option or the ``PYTHONPROFILEIMPORTTIME`` environment variable can be used to | |
|
|
| show the timing of each module import | |
|
|
+-----------------------------------------------------------------------------------------------------------------+----------------+
|
|
|
|
Changes to built-in modules:
|
|
|
|
.. table::
|
|
:widths: 90 10
|
|
|
|
+------------------------------------------------------------------------------------------------------------+----------------+
|
|
| `asyncio <https://docs.python.org/3/whatsnew/3.7.html#asyncio>`_ | |
|
|
+------------------------------------------------------------------------------------------------------------+----------------+
|
|
| Too many to list | |
|
|
+------------------------------------------------------------------------------------------------------------+----------------+
|
|
| `gc <https://docs.python.org/3/whatsnew/3.7.html#gc>`_ | |
|
|
+------------------------------------------------------------------------------------------------------------+----------------+
|
|
| New features include *gc.freeze()*, *gc.unfreeze()*, *gc-get_freeze_count* | |
|
|
+------------------------------------------------------------------------------------------------------------+----------------+
|
|
| `math <https://docs.python.org/3/whatsnew/3.7.html#math>`_ | |
|
|
+------------------------------------------------------------------------------------------------------------+----------------+
|
|
| math.remainder() added to implement IEEE 754-style remainder | |
|
|
+------------------------------------------------------------------------------------------------------------+----------------+
|
|
| `re <https://docs.python.org/3/whatsnew/3.7.html#re>`_ | |
|
|
+------------------------------------------------------------------------------------------------------------+----------------+
|
|
| A number of tidy up features including better support for splitting on empty strings and copy support for | |
|
|
| compiled expressions and match objects | |
|
|
+------------------------------------------------------------------------------------------------------------+----------------+
|
|
| `sys <https://docs.python.org/3/whatsnew/3.7.html#sys>`_ | |
|
|
+------------------------------------------------------------------------------------------------------------+----------------+
|
|
| sys.breakpointhook() added. sys.get(/set)_coroutine_origin_tracking_depth() added | |
|
|
+------------------------------------------------------------------------------------------------------------+----------------+
|
|
| `time <https://docs.python.org/3/whatsnew/3.7.html#time>`_ | |
|
|
+------------------------------------------------------------------------------------------------------------+----------------+
|
|
| Mostly updates to support nanosecond resolution in PEP564, see above | |
|
|
+------------------------------------------------------------------------------------------------------------+----------------+
|
|
|
|
.. rubric:: Notes
|
|
|
|
.. [#ftimenanosec] Only :func:`time.time_ns` is implemented.
|
|
|