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...rounding of the input: >>> for x in (.002, -.001, .060): ... print(f'{round(x, 1) + 0.: .1f}') 0.0 0.0 0.1 There is ample evidence that, regardless of the language, programmers are often looking for a way to suppress negative zero, and landing on a variety of workarounds (pre-round, post-regex, etc.). A sampling: How to have negative zero always formatted as positive zero in a python string? (Python, post-regex) (Iron)Python formatting issue with modulo operator & "negati...
...Rounding: The name of the algorithm to be used when rounding is necessary, one of "round-down", "round-half-up", "round-half-even", "round-ceiling", "round-floor", "round-half-down", and "round-up". See Rounding Algorithms below. Flags and trap-enablers: Exceptional conditions are grouped into signals, controllable individually, each consisting of a flag (boolean, set when the signal occurs) and a trap-enabler (a boolean that controls behavior). The signals are: "clamped", "division-by-zero", "...
...round__(self), called from round(x), which returns the Integral closest to x, rounding half as the type chooses. float will change in 3.0 to round half toward even. There is also a 2-argument version, __round__(self, ndigits), called from round(x, ndigits), which should return a Real. In 2.6, math.floor, math.ceil, and round will continue to return floats. The int() conversion implemented by float is equivalent to trunc(). In general, the int() conversion should try __int__() first and if it i...
...rounds between 1 and 16, and 1-round encryption is insecure and 8-round encryption is believed secure, the default value for 'rounds' should be 8 or more. (Module implementors can choose a very slow but secure value, too, such as 16 in this example. This decision is left up to the implementor.) The following table lists keyword arguments defined by this PEP: Keyword Meaning counter Callable object that returns counter blocks (see below; CTR mode only) rounds Number of rounds of encryp...
Community Events Manager Job posting for the Community Events Manager The Python Software Foundation (PSF) is a 501(c)(3) non-profit corporation that holds the intellectual property rights behind the Python programming language. We also run the PyCon US conference annually, support other Python conferences/workshops around the world, and fund Python related development with our grants program. The mission of the Python Software Foundation is to promote, protect, and advance the Python programmi...
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Adelaide is looking for a Data Engineering Lead to join our Product and Engineering organization. As the leader in global attention measurement and activation, at Adelaide we strive for increased transparency of media quality and aligning market incentives around quality over quantity. The ideal candidate for this role will provide …
...round. Join us as a sponsor and help make a difference in the Python ecosystem! See Sponsorship Options and Apply FINANCIAL IMPACT OF 2020 and 2021 COVID-19 has changed all aspects of our lives and is reshaping our future. PyCon US typically generates over 65% of the PSF’s revenue. With PyCon US 2020 and 2021 happening virtually, the PSF may lose $1.2 million USD of expected revenue for those two years. In 2019, the strategic plan for the PSF shifted towa...
...round-trip all valid paths in Windows filesystems. Currently, the conversions between Unicode (in the OS) and bytes (in Python) were lossy and would fail to round-trip characters outside of the user's active code page. Notably, this does not impact the encoding of the contents of files. These will continue to default to locale.getpreferredencoding() (for text files) or plain bytes (for binary files). This only affects the encoding used when users pass a bytes object to Python where it is then pa...
...rounds and digest_size keywords could be added for a hash function which supports a variable number of rounds and several different output sizes, and they should default to values believed to be secure. Hash function modules define one variable: digest_size An integer value; the size of the digest produced by the hashing objects created by this module, measured in bytes. You could also obtain this value by creating a sample object and accessing its digest_size attribute, but it can be conven...
...round-trip is problem free: >>> ytext = yaml.dump(OrderedDict(items)) >>> print ytext !!python/object/apply:collections.OrderedDict - - [one, 1] - [two, 2] - [three, 3] - [four, 4] - [five, 5] >>> yaml.load(ytext) OrderedDict({'one': 1, 'two': 2, 'three': 3, 'four': 4, 'five': 5}) For the ConfigParser module, round-tripping is also problem free. Custom dicts were added in Py2.6 specifically to support ordered dictionaries: >>> config = ConfigParse...
...round or truncate depending on the C implementation, we know of no C implementation that doesn't truncate, and we're going to change the spec for int() to promise truncation. Note that classic division (and floor division) round towards negative infinity, while int() rounds towards zero, giving different answers for negative numbers. How do I specify the division semantics for input(), compile(), execfile(), eval() and exec? They inherit the choice from the invoking module. PEP 236 now list...
...rounded to milliseconds. The 10 repeated calls are done to minimize the loop overhead of the timing function itself. You could go even further and make 100 calls... Also note that the expression range(n) is calculated outside the timing brackets - another trick to minimize the overhead caused by the timing function. If you are worried about this overhead, you can calibrate it by calling the timing function with a do-nothing function. import time def timing(f, n, a):...
...round of grant proposals. 6. Public Relations Committee Several issues were discussed before finalizing the details of the public relations committee. The board agreed that it was not willing to pay members to do work for this committee. It also discussed the scope of the committee: Fund raising should remain with the public support committee. Registration of trademarks should be handled by the secretary. It was noted that CNRI was granted a trademark on Python on March 23, 2004. There i...
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Released: July 3, 2020
This is a beta preview of Python 3.9 Python 3.9 is still in development. This release, 3.9.0b4, is the fourth of five planned beta release previews. Beta release previews are intended to give the wider community the opportunity to test new features and bug fixes and to prepare their projects …
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...round of grants in the next few months. He noted that the PyCon worst-case-scenario commitment would not allow for grants. He also noted that he doesn't have the bandwidth to do much work on another round of grants, but with volunteers to delegate to, he could continue chairing the committee. He underestimated the follow-up work (contracts, review of reports, etc.). N. Norwitz said he might be able to help more next time. He also noted that he might also be able to get some Google resources...
...rounds' and 'digest_size' keywords could be added for a hash function which supports a variable number of rounds and several different output sizes, and they should default to values believed to be secure. Hash function modules define one variable: digest_size An integer value; the size of the digest produced by the hashing objects created by this module, measured in bytes. You could also obtain this value by creating a sample object and accessing its 'digest_size' attribute, but it can be co...
...rounded to whole releases. How the rounding is done is left to the potential release cadence PEP. After this time, a new election is held according to the procedures outlined below. There are no term limits, so the GUIDO may run for re-election for as long as they like. We expect GUIDOs to serve out their entire term of office, but of course, Life Happens. Should the GUIDO need to step down before their term ends, the vacancy will be filled by the process outlined below as per choosing a new ...
...round(0.98, 2) still gives 0.97999999999999998. Proposal Literals conforming to the regular expression '\d*.\d*' will be rational numbers. Backwards Compatibility The only backwards compatible issue is the type of literals mentioned above. The following migration is suggested: The next Python after approval will allow from __future__ import rational_literals to cause all such literals to be treated as rational numbers. Python 3.0 will have a warning, turned on by default, about such litera...
Python Success Stories Background MayaVi is an open source scientific data visualization tool written entirely in Python. I started work on MayaVi in 2000. At that time, a few colleagues of mine needed to visualize their computational fluid dynamics (CFD) data but the only suitable tools available were commercial, closed source programs that were prohibitively expensive. We looked at some open source tools as alternatives. OpenDX had just been released to the public and at that time was har...
...round of internships, but Alex will keep an eye out for the next round. 9 Adjournment Van Lindberg adjourned the meeting at 15:39 CEST/ 12:39 EDT.