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The Python programming language

548 mentions on Hacker News by 400 people: 44 stories, 504 comments · first 2014-12-30 · latest 2026-10-27

Mentions per year 548 mentions · busiest year 2025 (72)
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  1. …will be always wrong except in the uncommon case of a sequence of several identical opcodes). [1] https://github.com/python/cpython/blob/ff8ad0a576c6cf375e682...
    comment by vilda · 2017-10-04 · in Are Jump Tables Always Fastest?
  2. …you can + on BUT strings [0], this is to avoid quadratic behavior with string concatenation. [0] https://github.com/python/cpython/blob/5837d0418f47933b2e3c1...
    comment by Franciscouzo · 2017-09-30 · in Haskell People
  3. …[2] https://kbknapp.github.io/clap-rs/unicode_segmentation/index... [3] https://github.com/python/cpython/blob/49b2734bf12dc1cda80fd...
    comment by masklinn · 2017-09-07 · in How Python does Unicode
  4. …examples you gave are examples of that good use. The time.localtime() used to return a tuple. See https://github.com/python/cpython/blob/770e4042db8a1c277b5d9... . The change to StructTimeType is an example of how to do that sort of…
    comment by eesmith · 2017-08-30 · in Reducing Python's startup time
  5. …deeply first. For the specific case under discussion, ncoghlan added cache_info() on 30 Nov 2010 - https://github.com/python/cpython/commit/234515afe594e5f9ca1... Previously, "Performance statistics stored in f.cache_hits and…
    comment by eesmith · 2017-08-30 · in Reducing Python's startup time
  6. https://github.com/python/cpython/blob/v3.6.2/Lib/collection...
    comment by jwilk · 2017-08-30 · in Reducing Python's startup time
  7. …git archaeology. Here are relevant commits and bug reports: * Initial commit with -1...99 cached: https://github.com/python/cpython/commit/842d2ccdcd540399501... * Cache more negative numbers, -5...99:…
    comment by jwilk · 2017-08-24 · in Weird Python Integers
  8. …the GIL for the time of the compression (though it locks the compressor object simultaneously): https://github.com/python/cpython/blob/d4b93e21c2664d6a78e06...
    comment by akx · 2017-08-14 · in Let's Remove the Global Interpreter Lock
  9. Argparse's source is possibly the most difficult lib to grow from the stdlib. https://github.com/python/cpython/blob/master/Lib/argparse.p... For me, it is not debugable. I wanted to propose and start a reference implementation for…
    comment by yes_or_gnome · 2017-07-28 · in Python Entry Points Explained
  10. https://github.com/python/cpython/blob/5d75f441ef0a3cfe7af0d...
    comment by andars · 2017-07-22 · in Converting floats to strings
  11. …but it also doesn't appear to limit itself to C89, see for instance this random file I opened: https://github.com/python/cpython/blob/master/Python/future.... You can see that `const char *feature` is declared in the middle of some code.…
    comment by simias · 2017-07-13 · in Toward Go 2
  12. …like in C). In case anyone cares how Python actually does in in C, for small ints its defined at https://github.com/python/cpython/blob/master/Objects/longob...
    comment by kmill · 2017-07-04 · in Block-breaking game in vim 8.0
  13. Python has migrated from hg to git. The current version of tupleobject.c is here: https://github.com/python/cpython/blob/master/Objects/tupleo...
    comment by jwilk · 2017-06-26 · in Diving into the world of hash tables
  14. …of locals use an internal array of local variables, to skip dicts. Same with constants. See: https://github.com/python/cpython/blob/master/Python/ceval.c...
    comment by adrian17 · 2017-06-26 · in Diving into the world of hash tables
  15. …typed "python" and got no results, which seems pretty odd.) I would have liked to browse this repo: https://github.com/python/cpython I guess you have to import repositories yourself? There seem to be sample repositories, but they are in…
    comment by chubot · 2017-06-22 · in Show HN: Sourcetrail – Get productive on unfamiliar source code
  16. …awesome! I didn't know that too. It's pretty cool. Seems like they overload __truediv__ operator: https://github.com/python/cpython/blob/master/Lib/pathlib.py...
    comment by rajathagasthya · 2017-06-14 · in New features you can't use unless you are in Python 3
  17. Relevant: https://github.com/python/cpython/commit/30d00e54dde47b11f5b...
    comment by sprt · 2017-06-01 · in Hunting Performance in Python Code: Measuring Memory Consumption
  18. …for comparing integers. ;) [0] http://doc.pypy.org/en/latest/cpython_differences.html#objec... [1] https://github.com/python/cpython/blob/master/Objects/longob... [2] https://github.com/python/cpython/blob/ba85d69a3e3610bdd05f0...
    comment by squeaky-clean · 2017-05-25 · in Show HN: 15-question programming quiz with answers
  19. 0-256 not sure about negatives -5 to 256 (inclusive) [ https://github.com/python/cpython/blob/master/Objects/longob... ]
    comment by bakery2k · 2017-05-24 · in Show HN: 15-question programming quiz with answers
  20. 0 to 256 if I recall right -5 to 256 (inclusive) [ https://github.com/python/cpython/blob/master/Objects/longob... ]
    comment by bakery2k · 2017-05-24 · in Show HN: 15-question programming quiz with answers
  21. That was apparently fixed in Python 2.7: https://github.com/python/cpython/commit/6116d4a1d1ecd6e9b94... http://bugs.python.org/issue12099 But that commit pre-dates the blog post by many years, so maybe Armin was referring to something…
    comment by js2 · 2017-05-23 · in Python's Hidden Regular Expression Gems (2015)
  22. …where classes make sense in standard libraries would be (impure) interfaces such as csv.Dialect ( https://github.com/python/cpython/blob/6aee6fb/Lib/csv.py#L2... ) An example of where inherited classes make sense in abstraction would be…
    comment by tony · 2017-05-13 · in Ask HN: How often do you use inheritance?
  23. I just saw that Python's Makefile has support for PGO builds: https://github.com/python/cpython/blob/master/Makefile.pre.i... Not sure when it was added, but Python 2.7 has it. It's not clear to me how to tell if say my Ubuntu binary is…
    comment by chubot · 2017-05-02 · in Kotlin doesn’t need an LLVM backend (2016)
  24. …python-git instead of the main Python repo. The whole project has been moved as of a couple months. https://github.com/python/cpython
    comment by xapata · 2017-04-24 · in Glob Matching Can Be Simple and Fast Too
  25. …old version of Python source from a mirror. It uses functools.lru_cache with a maxsize of 256 now: https://github.com/python/cpython/blob/fcfe80ec2592fed8b3941...
    comment by benhoyt · 2017-04-24 · in Glob Matching Can Be Simple and Fast Too
  26. …(in stdlibc it's just a double pointer to T IIRC). In Python it's a doubly-linked list of blocks: https://github.com/python/cpython/blob/master/Modules/_colle...
    comment by rocho · 2017-04-04 · in Interesting data structures: the BK-tree
  27. The only codebase I've checked personally can't handle Y10K, so there should be plenty of business: https://github.com/python/cpython/blob/6f0eb93183519024cb360...
    comment by elevensies · 2017-03-21 · in 2038: Only 21 years away
  28. …things. I'm totally sure now. Guido's last commit, in both the github repo and the mercurial repo. https://github.com/python/cpython/commit/934aba66ef09e94422b... https://hg.python.org/cpython/rev/3db1959c2c53 Someone sensible may be able…
    comment by harry8 · 2017-02-13 · in Python moved to GitHub
  29. …into a native environment block and gives it as the envp pointer to the exec/spawn functions. [1]: https://github.com/python/cpython/blob/a65137dc41fb52bdb1ca2... [2]: https://github.com/python/cpython/blob/a65137dc41fb52bdb1ca2... [3]:…
    comment by poizan42 · 2017-01-31 · in Don't setenv in multi-threaded code on glibc
  30. …python source code[1] implementation of the Environment class, I think python is also affected. 1. https://github.com/python/cpython/blob/master/Lib/os.py#L664
    comment by RabbitmqGuy · 2017-01-31 · in Don't setenv in multi-threaded code on glibc
  31. The decimal module in Python 2.7 is implemented in pure Python: https://github.com/python/cpython/blob/2.7/Lib/decimal.py (in Python 3 there is an accelerated extension module that's used when available, falling back on the pure Python…
    comment by brettcannon · 2017-01-04 · in Grumpy: Go running Python
  32. Brett, thanks for contributions to Python. (... and thanks to the other contributors, https://github.com/python/cpython/blob/master/Misc/ACKS , and to all people who volunteer their by contributing to open source...) I am another silent…
    comment by jamesdutc · 2016-12-21 · in Taking a month off from OSS volunteering
  33. I doubt that because defining a namedtuple just creates a new class internally: https://github.com/python/cpython/blob/master/Lib/collection... Class creation the very expensive in Python, so Guido van Rossum explicitly recommends against…
    comment by skrause · 2016-12-08 · in What’s New In Python 3.6
  34. …can robustly parse many different dialects of CSV is quite a challenge. Have a read of Python's: https://github.com/python/cpython/blob/master/Lib/csv.py EDIT: It's probably not fair to say that nobody actually uses the RFC 4180 version of…
    comment by twic · 2016-10-23 · in RFC4180 – Common Format and MIME Type for CSV Files (2005)
  35. What about the code for this python regular expression engine that is filled with goto statements? https://github.com/python/cpython/blob/master/Modules/sre_li... Or the code for the OpenSSL handshake that interleaves preprocessing…
    comment by deadowl · 2016-09-16 · in What to Do When Your Colleague Creates Spaghetti Code
  36. …using str.split(',') which is completely different than Python's offering of dialect/delimiter/etc https://github.com/python/cpython/blob/master/Lib/csv.py#L24
    comment by __s · 2016-09-03 · in Golang – encoding/csv: Reading is slow
  37. …helps. In Python, a list object over-allocates using a very peculiar, but finely tuned formula: https://github.com/python/cpython/blob/09dc3ec1713c677f71ba7...
    comment by justusw · 2016-08-23 · in When Big O Fools You
  38. …for example uses os.urandom for random UUID generation (uuid4), as can be seen in the source: https://github.com/python/cpython/blob/3.5/Lib/uuid.py#L603 The standard library guarantees that os.urandom is "[...] suitable for cryptographic…
    comment by justusw · 2016-08-20 · in How Long Should I Make My API Key?
  39. …grammar as specified in the file called Grammar in the canonical implementation of the language ( https://github.com/python/cpython/blob/master/Grammar/Gramma... ). Of course it's part of the grammar in the larger sense. I don't think that…
    comment by gary_bernhardt · 2016-08-08 · in Destroy All Software relaunches
  40. …those three problems and you didn't. I trust this reply will alleviate the misconception. [0]: https://github.com/python/cpython/blob/master/Objects/dictob... [1]: https://github.com/python/cpython/blob/master/Objects/dictob...
    comment by jsmthrowaway · 2016-07-14 · in Asciinema 1.3 Switches from Go Back to Python
  41. …hard way. For the curious, read through the comment here describing the data layout and invariants: https://github.com/python/cpython/blob/master/Include/unicod...
    comment by int_19h · 2016-06-20 · in UTF-8 Everywhere (2012)
  42. If you are lexing there is a much better way than trying to munge together a giant regex manually: https://github.com/python/cpython/blob/3.4/Lib/re.py#L346
    comment by justin_vanw · 2016-02-20 · in Python 3.4 supports only 100 regex groups
  43. https://github.com/python/cpython/commit/33455fe85760e0173ee...
    comment by 0x0 · 2016-02-20 · in Python 3.4 supports only 100 regex groups
  44. I guess you meant Python 3.4 because 3.5 has no limitation: https://github.com/python/cpython/blob/3.5/Lib/sre_compile.p...
    comment by namtrac · 2016-02-20 · in Python 3.4 supports only 100 regex groups
  45. …handler before you restart the syscal on EINTR in C code. Look at how os.waitpid() is implemented: https://github.com/python/cpython/blob/master/Modules/posixm...
    comment by d0mine · 2016-02-09 · in Writing my own init with Go
  46. …This does not exist in Python 3[2] (and therefore neither does the performance difference). [1] https://github.com/python/cpython/blob/2.7/Python/ceval.c#L1... [2] https://github.com/python/cpython/blob/master/Python/ceval.c...
    comment by pyre · 2016-02-08 · in Records: Python library for making raw SQL queries to Postgres databases
  47. …something like namedtuple there are other[2] things[3] you can use depending on your use-case. [1] https://github.com/python/cpython/blob/master/Lib/collection... [2] http://stackoverflow.com/a/2648186 [3]…
    comment by pyre · 2016-02-07 · in Records: Python library for making raw SQL queries to Postgres databases
  48. …of just how easy CPython's implementation is to read in many cases. [1]: see this, for example: https://github.com/python/cpython/blob/0eb5f5996feed30ade8c2... [2]: https://github.com/python/cpython/blob/0eb5f5996feed30ade8c2... [3]:…
    comment by deathanatos · 2016-01-14 · in Complexity of Python Operations (2013)
  49. …so far the only git presence of Python was a "semi-official readonly mirror" on github: https://github.com/python/cpython now does this mean that Python will completely switch away from Mercurial? this was one of the major projects still…
    comment by anarcat · 2016-01-01 · in Python moves to GitHub
  50. Indeed, the Python 3 Unicode string object is fascinatingly clever. Code worth reading: https://github.com/python/cpython/blob/master/Objects/unicod...
    comment by twoodfin · 2015-12-17 · in Why Python 3 Exists