This starts the process. Users who don't specify their own start method
and use the default on platforms where it is 'fork' will see a
DeprecationWarning upon multiprocessing.Pool() construction or upon
multiprocessing.Process.start() or concurrent.futures.ProcessPool use.
See the related issue and documentation within this change for details.
The default `tzinfo` param of the `combine()` signature pseudocode was erroneously `self.tzinfo`.
`self` has no meaning in the context of a classmethod, and the datetime class itself has no `tzinfo` attribute. The correct default pseudocode is `time.tzinfo`, reflecting that the default is the `tzinfo` attribute of the `time` parameter.
This is a follow-up to #100811.
One of the changes in that PR isn't accurate in that
`os.path.join('', '')` will not end in a separator.
This reverts that change to the previous wording that used "only", but
explicitly calls out the case where the last part ends in a separator,
which is what caused confusin in #77607 and motivated the change
in #100811.
`warnings.warn()` gains the ability to skip stack frames based on code
filename prefix rather than only a numeric `stacklevel=` via a new
`skip_file_prefixes=` keyword argument.
We don't need direct C APIs to get at a bigint representation of PyLong but we
do want the few people who need to understand how.
Additional Author: CAM-Gerlach
When testing element truth values, emit a DeprecationWarning in all implementations.
This had emitted a FutureWarning in the rarely used python-only implementation since ~2.7 and has always been documented as a behavior not to rely on.
Matching an element in a tree search but having it test False can be unexpected. Raising the warning enables making the choice to finally raise an exception for this ambiguous behavior in the future.
This PR adds support for float-style formatting for `Fraction` objects: it supports the `"e"`, `"E"`, `"f"`, `"F"`, `"g"`, `"G"` and `"%"` presentation types, and all the various bells and whistles of the formatting mini-language for those presentation types. The behaviour almost exactly matches that of `float`, but the implementation works with the exact `Fraction` value and does not do an intermediate conversion to `float`, and so avoids loss of precision or issues with numbers that are outside the dynamic range of the `float` type.
Note that the `"n"` presentation type is _not_ supported. That support could be added later if people have a need for it.
There's one corner-case where the behaviour differs from that of float: for the `float` type, if explicit alignment is specified with a fill character of `'0'` and alignment type `'='`, then thousands separators (if specified) are inserted into the padding string:
```python
>>> format(3.14, '0=11,.2f')
'0,000,003.14'
```
The exact same effect can be achieved by using the `'0'` flag:
```python
>>> format(3.14, '011,.2f')
'0,000,003.14'
```
For `Fraction`, only the `'0'` flag has the above behaviour with respect to thousands separators: there's no special-casing of the particular `'0='` fill-character/alignment combination. Instead, we treat the fill character `'0'` just like any other:
```python
>>> format(Fraction('3.14'), '0=11,.2f')
'00000003.14'
>>> format(Fraction('3.14'), '011,.2f')
'0,000,003.14'
```
The `Fraction` formatter is also stricter about combining these two things: it's not permitted to use both the `'0'` flag _and_ explicit alignment, on the basis that we should refuse the temptation to guess in the face of ambiguity. `float` is less picky:
```python
>>> format(3.14, '0<011,.2f')
'3.140000000'
>>> format(Fraction('3.14'), '0<011,.2f')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Users/mdickinson/Repositories/python/cpython/Lib/fractions.py", line 414, in __format__
raise ValueError(
ValueError: Invalid format specifier '0<011,.2f' for object of type 'Fraction'; can't use explicit alignment when zero-padding
```
While the documentation for `optparse` mentioned that both `store_const` and
`append_const` store a constant value, it was not clear where this value was
coming from.
A link to `Option.const` makes this explicit.
The documentation for `rglob` did not mention what `pattern` actually
is.
Mentioning and linking to `fnmatch` makes this explicit, as the
documentation for `fnmatch` both shows the syntax and some explanation.
* Update description of stdout, stderr, and stdin.
Changes:
- Move the ``None`` option (which is default) to the front of the list
of input options
- Move the ``None`` option description up to make the default behavior
more clear (No redirection)
- Remove mention of Child File Descriptors from ``None`` option description
The zipfile.Path open() and read_text() encoding parameter can be supplied as a positional argument without causing a TypeError again. 3.10.0b1 included a regression that made it keyword only.
Documentation update included as users writing code to be compatible with a wide range of versions will need to consider this for some time.
Partially revert changes made in GH-93453.
asyncio.DefaultEventLoopPolicy.get_event_loop() now emits a
DeprecationWarning and creates and sets a new event loop instead of
raising a RuntimeError if there is no current event loop set.
Co-authored-by: Guido van Rossum <gvanrossum@gmail.com>
* Clarify the meaning of the oparg for CACHE and COPY opcode in dis doc
* Use STACK to describe stack operation in analogy with a Python list
* Remove (delta) from BEFORE_WITH since BEFORE_WITH does not take an argument
* Fix the description of the stack impact of multiple opcodes
- Use "drive", not "drive letter", because of UNC paths
- Previous components are not thrown away from relative drive letters
- Use "segment" instead of "component" for consistency with pathlib
- Other miscellaneous improvements
The behaviour is fully explained a couple paragraphs above, but it may be useful to have a brief example to cover the behaviour.
Automerge-Triggered-By: GH:hauntsaninja
- Remove first link to lexical definition of integer literal, since it
doesn't apply (differs in handling of leading zeros, base needs to be
explicitly specified, unicode digits are allowed)
- Better describe handling of leading zeros, unicode digits, underscores
- Base 0 does not work exactly as like a code literal, since it allows
Unicode digits. Link code literal to lexical definition of integer
literal.
Mark Dickinson
busywhitespace
alnoki
Furkan Onder
Max Bachmann
Gregory P. Smith
François Magimel
Viet Than
C.A.M. Gerlach
Peter Gessler
Marcos Pereira
Steve Dower
Raj
Irit Katriel
beavailable
John Belmonte
Peter Jiping Xie
Christophe Nanteuil
Shantanu
Ben
Owain Davies
Sergey B Kirpichev
socal-nerdtastic
Vinay Sajip
Barney Gale
achhina
Mark Shannon
ram vikram singh
Carlton Gibson
Jacob Walls
Andrew Hong
Kamil Turek
scrazzz
Jürgen Gmach
caozhanhao
Simon Robinson
Vladimir Malinovskii
richardhob
Nikita Sobolev
Tushar Sadhwani
Erlend E. Aasland
Viicos
Oleg Iarygin
Cristián Maureira-Fredes
Bob Kline
JustAnotherArchivist
Raymond Hettinger
Serhiy Storchaka
Matthieu Dartiailh
Noam Cohen
Mariusz Felisiak
Yao-Ching Huang
Semen Zhydenko
Ryan Ozawa
dsentinel
Benjamin Peterson
FrozenBob
Akshit Tyagi
Tzu-ping Chung
David Lechner
Ethan Furman
Zachary Ware
4l4k4z4m
Kumar Aditya
Alexander Shadchin
Jason R. Coombs