Python is set to release a new version next year, the shiny 3.9. This one omitted the sys.argv change rolled back in alpha2 Here’s our take of the most noticeable changes:
Keyword Arguments Get Some Boost
improved
sebastian@seberg-x1 ~/python-dev/bin
% ./python3 -m timeit -s 'i = 4' 'i.to_bytes(length=5, byteorder="big", signed=True)'
1000000 loops, best of 5: 205 nsec per loop
sebastian@seberg-x1 ~/python-dev/bin
% ./python3 -m timeit -s 'i = 4' 'i.to_bytes(length=5, byteorder="big", signed=True)'
1000000 loops, best of 5: 207 nsec per loop
original
sebastian@seberg-x1 ~/python-dev/bin
% ./python3 -m timeit -s 'i = 4' 'i.to_bytes(length=5, byteorder="big", signed=True)'
1000000 loops, best of 5: 221 nsec per loop
sebastian@seberg-x1 ~/python-dev/bin
% ./python3 -m timeit -s 'i = 4' 'i.to_bytes(length=5, byteorder="big", signed=True)'
1000000 loops, best of 5: 218 nsec per loop
Audit hooks added for sys.excepthook() and sys.unraisablehook()
Audit hooks were added in PEP 578. It basically allows you to monitor low-level details. It’s aim is to monitor behaviors of Python scripts more accurately. Example of use in the wording of the PEP:
Auditing bypass can occur when the typical system tool used for an action would ordinarily report its use, but accessing the APIs via Python do not trigger this. For example, invoking “curl” to make HTTP requests may be specifically monitored in an audited system, but Python’s “urlretrieve” function is not.
Calling replace on a code object now raises the code.__new__ audit event.
The code object is returned when using the in-built compile() function on some codes. The corresponding C code:
if (PySys_Audit("code.__new__", "OOOiiiiii",
co_code, co_filename, co_name, co_argcount,
co_posonlyargcount, co_kwonlyargcount, co_nlocals,
co_stacksize, co_flags) < 0) {
return NULL;
}
Thread stack size set to 8 Mb for debug builds on Android
An initiated script crashes on Android API 24 but only in debug mode. The maximum recursion limit was reduced from 1000 to 100.
In Python you can’t recurse more than some limit.
>>> import sys
>>> sys.getrecursionlimit()
1000
The above patch was implemented by defining THREAD_STACK_SIZE to 8mb
define THREAD_STACK_SIZE 0x800000
Added __floor__ and __ceil__ method to float object
Was not previously implemented. Also added tests.
Use of python -m pip instead of pip to upgrade dependencies in venv
In cpython/Lib/venv/__init__.py alongsize some other changes, the below update sets python -m pip install as default for dependencies upgrade
if sys.platform == 'win32':
python_exe = os.path.join(context.bin_path, 'python.exe')
else:
python_exe = os.path.join(context.bin_path, 'python')
cmd = [python_exe, '-m', 'pip', 'install', '--upgrade']
cmd.extend(CORE_VENV_DEPS)
subprocess.check_call(cmd)
Excape key also closes IDLE completion windows
Many keys are used in auto completion. The escape key was just added
KEYPRESS_SEQUENCES = ("<Key>", "<Key-BackSpace>", "<Key-Return>", "<Key-Tab>",
"<Key-Up>", "<Key-Down>", "<Key-Home>", "<Key-End>",
"<Key-Prior>", "<Key-Next>", "<Key-Escape>")
That’s was my funnified personal pick!
Written by
Abdur-Rahmaan Janhangeer
Chef
Python author of 9+ years having worked for Python companies around the world
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