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docs/differences: Document details of new PEPs/features in Python 3.5+. And how they relate to MicroPython. As these features are implemented (or the decision is made to not implement them) the tables can be updated to document the differences between MicroPython and standard Python.
2021-10-13 08:02:37 +01:00
.. _python_35:
Python 3.5
==========
Below is a list of finalised/accepted PEPs for Python 3.5 grouped into their impact to MicroPython.
+----------------------------------------------------------------------------------------------------------+---------------+
| **Extensions to the syntax:** | **Status** |
+--------------------------------------------------------+-------------------------------------------------+---------------+
py/runtime: Allow multiple *args in a function call. This is a partial implementation of PEP 448 to allow unpacking multiple star args in a function or method call. This is implemented by changing the emitted bytecodes so that both positional args and star args are stored as positional args. A bitmap is added to indicate if an argument at a given position is a positional argument or a star arg. In the generated code, this new bitmap takes the place of the old star arg. It is stored as a small int, so this means only the first N arguments can be star args where N is the number of bits in a small int. The runtime is modified to interpret this new bytecode format while still trying to perform as few memory reallocations as possible. Signed-off-by: David Lechner <david@pybricks.com>
2020-03-25 04:54:45 +00:00
| `PEP 448 <https://www.python.org/dev/peps/pep-0448/>`_ | additional unpacking generalizations | Partial |
docs/differences: Document details of new PEPs/features in Python 3.5+. And how they relate to MicroPython. As these features are implemented (or the decision is made to not implement them) the tables can be updated to document the differences between MicroPython and standard Python.
2021-10-13 08:02:37 +01:00
+--------------------------------------------------------+-------------------------------------------------+---------------+
| `PEP 465 <https://www.python.org/dev/peps/pep-0465/>`_ | a new matrix multiplication operator | Completed |
+--------------------------------------------------------+-------------------------------------------------+---------------+
| `PEP 492 <https://www.python.org/dev/peps/pep-0492/>`_ | coroutines with async and await syntax | Completed |
+--------------------------------------------------------+-------------------------------------------------+---------------+
| **Extensions and changes to runtime:** |
+--------------------------------------------------------+-------------------------------------------------+---------------+
| `PEP 461 <https://www.python.org/dev/peps/pep-0461/>`_ | % formatting for binary strings | Completed |
+--------------------------------------------------------+-------------------------------------------------+---------------+
| `PEP 475 <https://www.python.org/dev/peps/pep-0475/>`_ | retrying system calls that fail with EINTR | Completed |
+--------------------------------------------------------+-------------------------------------------------+---------------+
| `PEP 479 <https://www.python.org/dev/peps/pep-0479/>`_ | change StopIteration handling inside generators | Completed |
+--------------------------------------------------------+-------------------------------------------------+---------------+
| **Standard library changes:** |
+--------------------------------------------------------+-------------------------------------------------+---------------+
| `PEP 471 <https://www.python.org/dev/peps/pep-0471/>`_ | os.scandir() | |
+--------------------------------------------------------+-------------------------------------------------+---------------+
| `PEP 485 <https://www.python.org/dev/peps/pep-0485/>`_ | math.isclose(), a function for testing | Completed |
| | approximate equality | |
+--------------------------------------------------------+-------------------------------------------------+---------------+
| **Miscellaneous changes:** |
+--------------------------------------------------------+-------------------------------------------------+---------------+
| `PEP 441 <https://www.python.org/dev/peps/pep-0441/>`_ | improved Python zip application support | |
+--------------------------------------------------------+-------------------------------------------------+---------------+
docs/differences/python_35: Mark PEP 486 as not applicable. This adds the "Not relevant" designation to PEP 486 since it has to do with the Python Launcher for Windows and not the Python language itself. Also fix a typo while we are touching this line. Signed-off-by: David Lechner <david@pybricks.com>
2022-03-05 15:51:34 +00:00
| `PEP 486 <https://www.python.org/dev/peps/pep-0486/>`_ | make the Python Launcher aware of virtual | Not relevant |
docs/differences: Document details of new PEPs/features in Python 3.5+. And how they relate to MicroPython. As these features are implemented (or the decision is made to not implement them) the tables can be updated to document the differences between MicroPython and standard Python.
2021-10-13 08:02:37 +01:00
| | environments | |
+--------------------------------------------------------+-------------------------------------------------+---------------+
| `PEP 484 <https://www.python.org/dev/peps/pep-0484/>`_ | type hints (advisory only) | In Progress |
+--------------------------------------------------------+-------------------------------------------------+---------------+
| `PEP 488 <https://www.python.org/dev/peps/pep-0488/>`_ | elimination of PYO files | Not relevant |
+--------------------------------------------------------+-------------------------------------------------+---------------+
| `PEP 489 <https://www.python.org/dev/peps/pep-0489/>`_ | redesigning extension module loading | |
+--------------------------------------------------------+-------------------------------------------------+---------------+
Other Language Changes:
+-----------------------------------------------------------------------------------------------------------+---------------+
| Added the *namereplace* error handlers. The *backslashreplace* error handlers now work with decoding and | |
| translating. | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| Property docstrings are now writable. This is especially useful for collections.namedtuple() docstrings | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| Circular imports involving relative imports are now supported. | |
+-----------------------------------------------------------------------------------------------------------+---------------+
New Modules:
* `typing <https://docs.python.org/3/whatsnew/3.5.html#typing>`_
* `zipzap <https://docs.python.org/3/whatsnew/3.5.html#zipapp>`_
Changes to built-in modules:
+-----------------------------------------------------------------------------------------------------------+---------------+
| `collections <https://docs.python.org/3/whatsnew/3.5.html#collections>`_ |
+-----------------------------------------------------------------------------------------------------------+---------------+
| The *OrderedDict* class is now implemented in C, which makes it 4 to 100 times faster. | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| *OrderedDict.items()* , *OrderedDict.keys()* , *OrderedDict.values()* views now support reversed() | |
| iteration. | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| The deque class now defines *index()*, *insert()*, and *copy()*, and supports the + and * operators. | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| Docstrings produced by namedtuple() can now be updated. | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| The UserString class now implements the *__getnewargs__()*, *__rmod__()*, *casefold()*, *format_map()*, | |
| *isprintable()*, and *maketrans()* methods to match the corresponding methods of str. | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| `heapq <https://docs.python.org/3/whatsnew/3.5.html#heapq>`_ |
+-----------------------------------------------------------------------------------------------------------+---------------+
| Element comparison in *merge()* can now be customized by passing a key function in a new optional key | |
| keyword argument, and a new optional *reverse* keyword argument can be used to reverse element comparison | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| `io <https://docs.python.org/3/whatsnew/3.5.html#io>`_ |
+-----------------------------------------------------------------------------------------------------------+---------------+
| A new *BufferedIOBase.readinto1()* method, that uses at most one call to the underlying raw stream's | |
| *RawIOBase.read()* or *RawIOBase.readinto()* methods | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| `json <https://docs.python.org/3/whatsnew/3.5.html#json>`_ | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| JSON decoder now raises JSONDecodeError instead of ValueError to provide better context information about | |
| the error. | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| `math <https://docs.python.org/3/whatsnew/3.5.html#math>`_ |
+-----------------------------------------------------------------------------------------------------------+---------------+
docs/differences: Update differences now that math.tau/inf/nan exist. Signed-off-by: Damien George <damien@micropython.org>
2022-01-22 22:33:19 +00:00
| Two new constants have been added to the math module: *inf* and *nan*. | Completed |
docs/differences: Document details of new PEPs/features in Python 3.5+. And how they relate to MicroPython. As these features are implemented (or the decision is made to not implement them) the tables can be updated to document the differences between MicroPython and standard Python.
2021-10-13 08:02:37 +01:00
+-----------------------------------------------------------------------------------------------------------+---------------+
| A new function *isclose()* provides a way to test for approximate equality. | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| A new *gcd()* function has been added. The *fractions.gcd()* function is now deprecated. | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| `os <https://docs.python.org/3/whatsnew/3.5.html#os>`_ |
+-----------------------------------------------------------------------------------------------------------+---------------+
| The new *scandir()* function returning an iterator of DirEntry objects has been added. | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| The *urandom()* function now uses the *getrandom()* syscall on Linux 3.17 or newer, and *getentropy()* on | |
| OpenBSD 5.6 and newer, removing the need to use /dev/urandom and avoiding failures due to potential file | |
| descriptor exhaustion. | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| New *get_blocking()* and *set_blocking()* functions allow getting and setting a file descriptor's blocking| |
| mode (O_NONBLOCK.) | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| There is a new *os.path.commonpath()* function returning the longest common sub-path of each passed | |
| pathname | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| `re <https://docs.python.org/3/whatsnew/3.5.html#re>`_ | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| References and conditional references to groups with fixed length are now allowed in lookbehind assertions| |
+-----------------------------------------------------------------------------------------------------------+---------------+
| The number of capturing groups in regular expressions is no longer limited to 100. | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| The *sub()* and *subn()* functions now replace unmatched groups with empty strings instead of raising an | |
| exception. | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| The *re.error* exceptions have new attributes, msg, pattern, pos, lineno, and colno, that provide better | |
| context information about the error | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| `socket <https://docs.python.org/3/whatsnew/3.5.html#socket>`_ |
+-----------------------------------------------------------------------------------------------------------+---------------+
| Functions with timeouts now use a monotonic clock, instead of a system clock. | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| A new *socket.sendfile()* method allows sending a file over a socket by using the high-performance | |
| *os.sendfile()* function on UNIX, resulting in uploads being from 2 to 3 times faster than when using | |
| plain *socket.send()* | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| The *socket.sendall()* method no longer resets the socket timeout every time bytes are received or sent. | |
| The socket timeout is now the maximum total duration to send all data. | |
+-----------------------------------------------------------------------------------------------------------+---------------+
docs/differences: Update Python 3.5 diff, with optional listen backlog. Signed-off-by: Damien George <damien@micropython.org>
2022-04-04 14:08:59 +01:00
| The backlog argument of the *socket.listen()* method is now optional. By default it is set to SOMAXCONN or| Completed |
docs/differences: Document details of new PEPs/features in Python 3.5+. And how they relate to MicroPython. As these features are implemented (or the decision is made to not implement them) the tables can be updated to document the differences between MicroPython and standard Python.
2021-10-13 08:02:37 +01:00
| to 128, whichever is less. | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| `ssl <https://docs.python.org/3/whatsnew/3.5.html#ssl>`_ |
+-----------------------------------------------------------------------------------------------------------+---------------+
| Memory BIO Support | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| Application-Layer Protocol Negotiation Support | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| There is a new *SSLSocket.version()* method to query the actual protocol version in use. | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| The SSLSocket class now implements a *SSLSocket.sendfile()* method. | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| The *SSLSocket.send()* method now raises either the *ssl.SSLWantReadError* or *ssl.SSLWantWriteError* | |
| exception on a non-blocking socket if the operation would block. Previously, it would return 0. | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| The *cert_time_to_seconds()* function now interprets the input time as UTC and not as local time, per RFC | |
| 5280. Additionally, the return value is always an int. | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| New *SSLObject.shared_ciphers()* and *SSLSocket.shared_ciphers()* methods return the list of ciphers sent | |
| by the client during the handshake. | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| The *SSLSocket.do_handshake()*, *SSLSocket.read()*, *SSLSocket.shutdown()*, and *SSLSocket.write()* | |
| methods of the SSLSocket class no longer reset the socket timeout every time bytes are received or sent. | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| The *match_hostname()* function now supports matching of IP addresses. | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| `sys <https://docs.python.org/3/whatsnew/3.5.html#sys>`_ |
+-----------------------------------------------------------------------------------------------------------+---------------+
| A new *set_coroutine_wrapper()* function allows setting a global hook that will be called whenever a | |
| coroutine object is created by an async def function. A corresponding *get_coroutine_wrapper()* can be | |
| used to obtain a currently set wrapper. | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| A new *is_finalizing()* function can be used to check if the Python interpreter is shutting down. | |
+-----------------------------------------------------------------------------------------------------------+---------------+
| `time <https://docs.python.org/3/whatsnew/3.5.html#time>`_ |
+-----------------------------------------------------------------------------------------------------------+---------------+
| The *monotonic()* function is now always available | |
+-----------------------------------------------------------------------------------------------------------+---------------+