Python 3.5
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 | |
|---|---|---|
| PEP 448 | Additional unpacking generalizations | Partial |
| PEP 465 | A new matrix multiplication operator | Complete |
| PEP 492 | Coroutines with async and await syntax | Complete |
| Extensions and changes to runtime | ||
| PEP 461 | % formatting for binary strings | Complete |
| PEP 475 | Retrying system calls that fail with EINTR | Complete |
| PEP 479 | Change StopIteration handling inside generators | Complete |
| Standard library changes | ||
| PEP 471 | os.scandir() | |
| PEP 485 | math.isclose(), a function for testingapproximate equality | Complete |
| Miscellaneous changes | ||
| PEP 441 | Improved Python zip application support | |
| PEP 486 | Make the Python Launcher aware of virtual environments | Not relevant |
| PEP 484 | Type hints (advisory only) | Complete |
| PEP 488 | Elimination of PYO files | Not relevant |
| PEP 489 | 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:
Changes to built-in modules:
| 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 | |
| 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 | |
| A new BufferedIOBase.readinto1() method, that uses at most one call to the underlying raw stream’s RawIOBase.read() or RawIOBase.readinto() methods | |
| json | |
| JSON decoder now raises JSONDecodeError instead of ValueError to provide better context information about the error. | |
| math | |
| Two new constants have been added to the math module: inf and nan. | Complete |
| 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 | |
| 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 | |
| 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 | |
| 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. | |
| The backlog argument of the socket.listen() method is now optional. By default it is set to SOMAXCONN or to 128, whichever is less. | Complete |
| 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 | |
| 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 | |
| The monotonic() function is now always available |
Notes
The MicroPython parser correct ignores all type hints. However, the typing module is not built-in.