Python-ideas September 2017

python-ideas@python.org

81 participants
43 discussions

Extension of python/json syntax to support explicitly sets and ordered dict.
by Matteo Nastasi 07 Sep '17

07 Sep '17

Hi all, few days ago I thought about a way to rapresent sets and ordered dicts using a json compatible syntax, these are my conclusions: A set could be defined as { item1, item2, item3[...] } with {,} as an empty set An ordered dict could be defined as [ item1: value1, item2: value2 ... ] with [:] ase an empty odered dict It could be used inside python code or to serialize python structures in a json-like format (pyson maybe ?). What do you think about ? Kind regards, Matteo. -- email: nastasi(a)alternativeoutput.it, matteo.nastasi(a)gmail.com web: www.alternativeoutput.it irc: #linux-mi(a)irc.freenode.net linkedin: http://lnkd.in/SPQG87

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Add os.usable_cpu_count()
by Giampaolo Rodola' 05 Sep '17

05 Sep '17

Recently os.cpu_count() on Windows has been fixed in order to take process groups into account and return the number of all available CPUs: http://bugs.python.org/issue30581 This made me realize that os.cpu_count() does not return the number of *usable* CPUs, which could possibly represent a better default value for things like multiprocessing and process pools. It is currently possible to retrieve this info on UNIX with len(os.sched_getaffinity(0)) which takes CPU affinity and (I think) Linux cgroups into account, but it's not possible to do the same on Windows which provides this value via GetActiveProcessorCount() API. As such I am planning to implement this in psutil but would like to know how python-ideas feels about adding a new os.usable_cpu_count() function (or having os.cpu_count(usable=True)). Thoughts? -- Giampaolo - http://grodola.blogspot.com

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tarfile.extractall progress
by Tarek Ziadé 03 Sep '17

03 Sep '17

Hey, For large archives, I want to display a progress bar while the archive is being extracted with: https://docs.python.org/3/library/tarfile.html#tarfile.TarFile.extractall I could write my own version of extractall() to do this, or maybe we could introduce a callback option that gets called everytime .extract() is called in extractall() The callback can receive the tarinfo object and where it's being extracted. This is enough to plug a progress bar and avoid reinventing .extractall() I can add a ticket and maybe a patch if people think this is a good little enhancement Cheers Tarek -- Tarek Ziadé | coding: https://ziade.org | running: https://foule.es | twitter: @tarek_ziade

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Python-ideas September 2017