Mailman 3 - Python-list

Re: get_used_memory
by Jon Ribbens 16 জুন, 2026

16 জুন, 2026

On 2026-06-15, Paul Rubin <no.email(a)nospam.invalid> wrote: > Jon Ribbens <jon+usenet(a)unequivocal.eu> writes: >>> { a : int(b)) for x in xs if (a,b := x.split()) } >> No, for three reasons. Firstly, the lines with units result in x.split() >> having 3 members, so you can't assign it to a 2-tuple. > > Oh yes I had intended to say x.split()[:2] but somehow left that out. > >> Secondly, it appears that (a, b := x) means "create a tuple whose >> first member is a and whose second member is x, and also assign x to >> b", which is not at all what we need. > > Yuck, I had expected tuple unpacking. Sounds like a pitfall comparable > to "=" vs "==" that kept the := operator out of the language for so > long. Oh well. My biggest complaint about := is the arbitrary and mysterious restrictions on what you can use on the left hand side. You can't even say "a.b := c". The PEP that introduced ":=" barely even mentions these restrictions, let alone discusses or explains them.

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Thanks for joining us
by info＠physalia-courses.org 15 জুন, 2026

15 জুন, 2026

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[ANN] Dev.us.kg - A new, free community forum for developers of all languages
by Facha Nf 15 জুন, 2026

15 জুন, 2026

Hello Python community, I'm excited to announce the launch of **Dev.us.kg**, a new, free community forum for developers of all skill levels. 🔗 Forum: https://dev.us.kg **What you can do on the forum:** - Ask technical questions and get help - Share your side projects and get feedback - Discuss best practices for any programming language - Connect with other developers **Categories include:** - Python 🐍 - PHP 🐘 - Rust 🦀 - C# (.NET) - Ruby 💎 - SQL - Lua - HTML CSS JS - Share Tools The forum is completely free, has no tracking, and is open to everyone. It's a space to learn, share, and build together. **Why join?** - you can Get help with your Python code - Share projects you're proud of - Learn from other developers - Help others grow Join us and help build a welcoming developer community: 👉 https://dev.us.kg Best regards, AmineKHD

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Re: get_used_memory
by Jon Ribbens 15 জুন, 2026

15 জুন, 2026

On 2026-06-15, Paul Rubin <no.email(a)nospam.invalid> wrote: > Jon Ribbens <jon+usenet(a)unequivocal.eu> writes: >> {e[0][:-1]: int(e[1]) for x in xs if (e := x.split())} > > Does this work? > > { a : int(b)) for x in xs if (a,b := x.split()) } No, for three reasons. Firstly, the lines with units result in x.split() having 3 members, so you can't assign it to a 2-tuple. Secondly, it appears that (a, b := x) means "create a tuple whose first member is a and whose second member is x, and also assign x to b", which is not at all what we need. Thirdly, if we fix that second one by saying ((a, b) := x.split()), you get "SyntaxError: cannot use assignment expressions with tuple". (Assignment expressions are weirdly limited for no apparent reason.) > I think it's ok to keep the ':' in the field name. Otherwise > > { a.rstrip(':') : int(b)) for x in xs if (a,b := x.split()) } > > seems a bit more explicit at the expense of a few more chars. a[:-1] would work and is shorter. But yeah it doesn't matter much.

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Re: get_used_memory
by Jon Ribbens 13 জুন, 2026

13 জুন, 2026

On 2026-06-13, Paul Rubin <no.email(a)nospam.invalid> wrote: > Jon Ribbens <jon+usenet(a)unequivocal.eu> writes: >> Lawrence's version used your neat dict(line.split()[:2] ...) trick. > > Maybe this: > > dict((a,int(b)) for a,b in (x.split()[:2] for x in xs)) > > I feel like there should be a way to do this with the := operator > instead of the nested generators, but it doesn't seem to be there. That was the way my version did it? If I use abbreviated variable names like your version, it's actually shorter than yours ;-) {e[0][:-1]: int(e[1]) for x in xs if (e := x.split())}

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Re: get_used_memory
by Jon Ribbens 13 জুন, 2026

13 জুন, 2026

On 2026-06-13, Paul Rubin <no.email(a)nospam.invalid> wrote: > Jon Ribbens <jon+usenet(a)unequivocal.eu> writes: > >> Oh, and doesn't have ints as the dictionary values, which is rather >> more fatal to the use-case. > >> print("Used memory: %d Kb" % (info["MemTotal"] - info["MemFree"] - info["Buffers"] - info["Cached"] + info["SwapTotal"] - info["SwapFree"] - info["SwapCached"])) > > It really should look at the units in the meminfo file too, but anyway, Yes, although that's not entirely possible since proc_meminfo(5) doesn't document what units are possible (although in actual fact it appears that every line is hard-coded to either say 'kB' or no unit, no other options are available and which lines have 'kB' or not never changes). > alloced = ['MemTotal', 'SwapTotal'] > free = ['MemFree, 'Buffers', 'Cached', 'SwapFree', 'SwapCached'] > > def total(xs): return sum(int(info[f'{x}:']) for x in xs) > print(f''Used memory: {total(alloced) - total(free)} Kb') Yes, obviously it is physically possible to write the code to cope with the altered data structure. Just, there's a reason that neither my nor Lawrence's version used your neat dict(line.split()[:2] ...) trick.

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Re: get_used_memory
by Jon Ribbens 13 জুন, 2026

13 জুন, 2026

On 2026-06-13, Paul Rubin <no.email(a)nospam.invalid> wrote: > Jon Ribbens <jon+usenet(a)unequivocal.eu> writes: >> with open('/proc/meminfo') as meminfo: >> info = { >> entry[0][:-1]: int(entry[1]) >> for line in meminfo >> if (entry := line.split()) >> } > > with open('/proc/meminfo') as meminfo: > info = dict(line.split()[:2] for line in meminfo) An excellent point, although it does mean the ':' characters remain in the dictionary keys.

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[ANN] Pterocos - Free browser-based Python editor (plus C#, Rust, Ruby, SQL, Lua)
by Facha Nf 13 জুন, 2026

13 জুন, 2026

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Re: get_used_memory
by Jon Ribbens 12 জুন, 2026

12 জুন, 2026

On 2026-06-12, Lawrence D’Oliveiro <ldo(a)nz.invalid> wrote: > So I looked at the example Gambas program at ><https://gambaswiki.org/wiki/doc/whatisgambas> and marvelled at its > unnecessary complexity (UUOC, even). It’s like PHP with variable > declarations! > > Here’s my version: excluding header comments and blank lines and > shebang line, it’s about half the size. > > info = dict \ > ( > (entry[0][:-1], int(entry[-2])) > for line in open("/proc/meminfo", "rt") > for entry in (tuple(s.strip() for s in line.split(" ")),) > if entry[-2] != "" > ) > print("Used memory: %d Kb" % (info["MemTotal"] - info["MemFree"] - info["Buffers"] - info["Cached"] + info["SwapTotal"] - info["SwapFree"] - info["SwapCached"])) Better: with open('/proc/meminfo') as meminfo: info = { entry[0][:-1]: int(entry[1]) for line in meminfo if (entry := line.split()) } print('Used memory: %d kB' % ( info['MemTotal'] - info['MemFree'] - info['Buffers'] - info['Cached'] + info['SwapTotal'] - info['SwapFree'] - info['SwapCached'] ))

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Forcely make "private method or property" invisble and cannot be accessed directly
by WeiTung 4 জুন, 2026

4 জুন, 2026

Hello all: Until now we see if you have a class like this following in Python class MyClass: __myPrivateMember = 0 def __myPrivateMethod(self): # Here goes with what you want freely pass 　　mc = MyClass() 　　mc._MyClass__myPrivateMethod() Here we can still play with "__myPrivateMethod " by giving the auto-generated prefix (this has been a public secret, you know), so it’s also for the "__myPrivateMember ". What I wanna say is, this isn't a good idea, because since it's private, why could we still access it? We must abandon anyone to access it anyway. Maybe we should generate some random string (such as address of method/property?) or something like it? This means everytime when we run the code, the "private" thing is random after compiling, only the Python system itself know how to access it. For those who directly access the "private" things, compiler SHOULD give them an error, and when running , "AttributeNotFound" still occurs. That's all my idea for good practice of programming in OOP for Python. ----- This email is signed by the free S/MIME certificate of “CerSign” (https://www.cersign.com/smime-email-certificates.html) Be sure to import the root certificate of “CerSign Identity RSA Root” into your trust root certificate list for encryption, download it from https://www.cersign.com/root/rsa.html If you see “smime.p7s” in my letter, you can ignore it because your mailbox doesn’t support S/MIME

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