Re: on a tail-recursive square-and-multiply
On 8/11/23 2:26 pm, Julieta Shem wrote: For the first time I'm trying to write a tail-recursive square-and-multiply and, even though it /seems/ to work, I'm not happy with what I wrote and I don't seem to understand it so well. Stepping back a bit, why do you feel the need to write this tail-recursively? Is it just an exercise? Note that Python doesn't optimise tail calls, so anything that can be done tail-recursively is probably better done iteratively. --8<---cut here---start->8--- def sam(b, e, m, acc = 1): if e == 0: return acc if is_even(e): return sam(remainder(b * b, m), e//2, m, acc) else: return sam(b, e - 1, m, remainder(b * acc, m)) --8<---cut here---end--->8--- You see, I tried to use an accumulator, but I'm only accumulating when the exponent is odd. When it's even, I feel I'm forced to change the base into b * b mod m and leave the accumulator alone. This feels so unnatural to me. I feel I broke some symmetry there. I'm having to think of two cases --- when I change the accumulator and when I change the base. That seems too much for my small head. Can you help? Well, there are inherently two cases, and they're different, so I don't think you're doing anything wrong here. It was asymmetrical to begin with. If you were doing it iteratively you would also be leaving the accumulator alone when the exponent is even. -- Greg -- https://mail.python.org/mailman/listinfo/python-list
Re: on a tail-recursive square-and-multiply
On 11/7/23 18:26, Julieta Shem via Python-list wrote: > For the first time I'm trying to write a tail-recursive > square-and-multiply and, even though it /seems/ to work, I'm not happy > with what I wrote and I don't seem to understand it so well. > > --8<---cut here---start->8--- > def sam(b, e, m, acc = 1): > if e == 0: > return acc > if is_even(e): > return sam(remainder(b * b, m), e//2, m, acc) > else: > return sam(b, e - 1, m, remainder(b * acc, m)) > --8<---cut here---end--->8--- I don't see any definition of "remainder()" When you post to the list, please provide short but complete code, including a demonstration of using the code provided. That will help others understand what you are trying to do, and perhaps comment on your concerns. > You see, I tried to use an accumulator, but I'm only accumulating when > the exponent is odd. When it's even, I feel I'm forced to change the > base into b * b mod m and leave the accumulator alone. This feels so > unnatural to me. I feel I broke some symmetry there. I'm having to > think of two cases --- when I change the accumulator and when I change > the base. That seems too much for my small head. Can you help? I don't really understand the code either, so I cannot help much. -- https://mail.python.org/mailman/listinfo/python-list
on a tail-recursive square-and-multiply
For the first time I'm trying to write a tail-recursive square-and-multiply and, even though it /seems/ to work, I'm not happy with what I wrote and I don't seem to understand it so well. --8<---cut here---start->8--- def sam(b, e, m, acc = 1): if e == 0: return acc if is_even(e): return sam(remainder(b * b, m), e//2, m, acc) else: return sam(b, e - 1, m, remainder(b * acc, m)) --8<---cut here---end--->8--- You see, I tried to use an accumulator, but I'm only accumulating when the exponent is odd. When it's even, I feel I'm forced to change the base into b * b mod m and leave the accumulator alone. This feels so unnatural to me. I feel I broke some symmetry there. I'm having to think of two cases --- when I change the accumulator and when I change the base. That seems too much for my small head. Can you help? -- https://mail.python.org/mailman/listinfo/python-list
Re: Help
On 7/11/2023 9:02 am, Jason Friedman via Python-list wrote: On Sun, Nov 5, 2023 at 1:23 PM office officce via Python-list < python-list@python.org> wrote: which python version is better to be used and how to make sure it works on my window 10 because i downloaded it and it never worked so I uninstall to do that again please can you give me the steps on how it will work perfectly 1. Download from https://python.org (not Microsoft) and always choose the 64-bit stable version 2. Choose the installation location as C:\Python311 (avoid the default) 4. Accept other recommended installation options especially to include Python on the path (if offered) Guaranteed to work. Also, you will never have to uninstall. Install the next version in C:\Python312 etc In due course, investigate virtual environments so you can work on projects simultaneously using different versions of Python or different versions of various Python libraries. Good luck Mike If you are just starting out, the most recent version is 3.12 and is probably your best choice. When you say it never worked, can you describe in more detail what you did and what error messages you encountered? This mailing list does not accept screenshots. -- Signed email is an absolute defence against phishing. This email has been signed with my private key. If you import my public key you can automatically decrypt my signature and be sure it came from me. Your email software can handle signing. OpenPGP_signature.asc Description: OpenPGP digital signature -- https://mail.python.org/mailman/listinfo/python-list
Re: fCONV_AUSRICHTG is not defined - Why?
On 8/11/23 8:10 am, MRAB wrote: Something to do with how scoping is implemented in comprehensions? Yes, together with the way class scopes work during class construction. Behind the scenes, the body of a listcomp happens to be implemented as a nested function. Usually you don't notice this, but while a class is being built, its scope doesn't count as an enlosing scope for functions defined within the class. This is necessary, otherwise all of a class's attributes would be visible inside its methods, which isn't what we want. However, it leads to some odd corner cases, such as this one. There are various ways you could work around this. I would suggest moving the offending code outside the class and qualifying the constants it uses with the class name. -- Greg -- https://mail.python.org/mailman/listinfo/python-list
Re: fCONV_AUSRICHTG is not defined - Why?
On 2023-11-07 20:56, Thomas Passin via Python-list wrote: On 11/7/2023 3:29 PM, MRAB via Python-list wrote: On 2023-11-07 19:20, Jim Schwartz via Python-list wrote: Where do you define fCONV_AUSRICHTG? It must be initialized or defined somewhere. Did you leave out a statement from the python 2 version? It's given its value here: ( fNAME, fLG1, fLG2, fTYP, fCONV_AUSRICHTG, fENTRY_AUSRICHTG, fTEXT_AUSRICHTUNG, fHOLFUNKT, fPRUEFFUNKT, fPRUEF_ARG, ) = list(range(10)) This construction is a sneaky way to assign index numbers to list entries. A simplified example: >>> S1 = 'string 1' >>> S2 = 'string 2' >>> (fS1, fS2) = list(range(2)) >>> fS1 0 >>> >>> fS2 1 You don't need the 'list', though: range(...) will work on its own. [snip] -- https://mail.python.org/mailman/listinfo/python-list
Re: fCONV_AUSRICHTG is not defined - Why?
On 11/7/2023 3:29 PM, MRAB via Python-list wrote: On 2023-11-07 19:20, Jim Schwartz via Python-list wrote: Where do you define fCONV_AUSRICHTG? It must be initialized or defined somewhere. Did you leave out a statement from the python 2 version? It's given its value here: ( fNAME, fLG1, fLG2, fTYP, fCONV_AUSRICHTG, fENTRY_AUSRICHTG, fTEXT_AUSRICHTUNG, fHOLFUNKT, fPRUEFFUNKT, fPRUEF_ARG, ) = list(range(10)) This construction is a sneaky way to assign index numbers to list entries. A simplified example: >>> S1 = 'string 1' >>> S2 = 'string 2' >>> (fS1, fS2) = list(range(2)) >>> fS1 0 >>> >>> fS2 1 On Nov 7, 2023, at 1:06 PM, Thomas Passin via Python-list wrote: On 11/7/2023 12:47 PM, Egon Frerich via Python-list wrote: I've no idea why this happens. In a module there are lists and definitions: Felder = [ # Name lg1 lg2 typ Ausrichtung Holen Prüfen Prüfvorg ["Jahr", 4, 5, "u", "", "right", "center"], ["Monat", 2, 5, "u", "", "right", "center"], ["Tag", 2, 3, "u", "", "right", "center"], ["Belegnr", 5, 7, "s", "", "right", "center"], ["Bank", 2, 4, "u", "", "center", "center"], ["Art", 2, 3, "u", "", "center", "center"], ["Aufg", 2, 4, "u", "", "center", "center"], ["Text", 25, 25, "s", "-", "left", "left"], ["Ergänzung", 12, 12, "s", "-", "left", "left"], ["Betrag", 13, 13, "s", "", "right", "right"], ["W", 1, 2, "s", "", "center", "center"], ["WBetrag", 7, 7, "s", "", "right", "right"], ["Kurs", 6, 6, "s", "", "right", "right"], ] "Reihenfolge in der Dimension 1" ( fJAHR, fMONAT, fTAG, fBELEGNR, fBANK, fART, fAUFGABE, fTEXT, fTEXTERG, fBETRAG, fWAEHRUNG, fBETRAGinWAEHRUNG, fUMRECHNUNGSKURS, ) = list(range(13)) "Reihenfolge in der Dimension 2" ( fNAME, fLG1, fLG2, fTYP, fCONV_AUSRICHTG, fENTRY_AUSRICHTG, fTEXT_AUSRICHTUNG, fHOLFUNKT, fPRUEFFUNKT, fPRUEF_ARG, ) = list(range(10)) Two lines with test statements follow and the statement which produces an error: print(Felder) print(fJAHR, fNAME, fTYP, fCONV_AUSRICHTG) akette = "%" + "%".join( ["%s%s%s " % (i[fCONV_AUSRICHTG], i[fLG2], i[fTYP]) for i in Felder]) The traceback shows: $ python3 testGeldspurGUI.py [['Jahr', 4, 5, 'u', '', 'right', 'center'], ['Monat', 2, 5, 'u', '', 'right', 'center'], ['Tag', 2, 3, 'u', '', 'right', 'center'], ['Belegnr', 5, 7, 's', '', 'right', 'center'], ['Bank', 2, 4, 'u', '', 'center', 'center'], ['Art', 2, 3, 'u', '', 'center', 'center'], ['Aufg', 2, 4, 'u', '', 'center', 'center'], ['Text', 25, 25, 's', '-', 'left', 'left'], ['Ergänzung', 12, 12, 's', '-', 'left', 'left'], ['Betrag', 13, 13, 's', '', 'right', 'right'], ['W', 1, 2, 's', '', 'center', 'center'], ['WBetrag', 7, 7, 's', '', 'right', 'right'], ['Kurs', 6, 6, 's', '', 'right', 'right']] 0 0 3 4 Traceback (most recent call last): File "/home/egon/Entw/Geldspur/geldspur/testGeldspurGUI.py", line 15, in from tests.testU2 import testU2 File "/home/egon/Entw/Geldspur/geldspur/tests/testU2.py", line 9, in from gui.GUI_Konfig import GUIcfg File "/home/egon/Entw/Geldspur/geldspur/gui/GUI_Konfig.py", line 11, in class GUIcfg: File "/home/egon/Entw/Geldspur/geldspur/gui/GUI_Konfig.py", line 90, in GUIcfg ["%s%s%s " % (i[fCONV_AUSRICHTG], i[fLG2], i[fTYP]) for i in Felder]) File "/home/egon/Entw/Geldspur/geldspur/gui/GUI_Konfig.py", line 90, in ["%s%s%s " % (i[fCONV_AUSRICHTG], i[fLG2], i[fTYP]) for i in Felder]) NameError: name 'fCONV_AUSRICHTG' is not defined You see "Felder" and with "0 0 3 4" the correct value 4 for fCONV_AUSRICHTG. But there is the NameError. What does mean? Is there a change from python2 to python3? You are using a syntax that I don't understand, but "listcomp" means a list comprehenson. -- https://mail.python.org/mailman/listinfo/python-list
Re: fCONV_AUSRICHTG is not defined - Why?
On 2023-11-07 19:20, Jim Schwartz via Python-list wrote: Where do you define fCONV_AUSRICHTG? It must be initialized or defined somewhere. Did you leave out a statement from the python 2 version? It's given its value here: ( fNAME, fLG1, fLG2, fTYP, fCONV_AUSRICHTG, fENTRY_AUSRICHTG, fTEXT_AUSRICHTUNG, fHOLFUNKT, fPRUEFFUNKT, fPRUEF_ARG, ) = list(range(10)) On Nov 7, 2023, at 1:06 PM, Thomas Passin via Python-list wrote: On 11/7/2023 12:47 PM, Egon Frerich via Python-list wrote: I've no idea why this happens. In a module there are lists and definitions: Felder = [ # Name lg1 lg2 typ Ausrichtung Holen Prüfen Prüfvorg ["Jahr", 4, 5, "u", "", "right", "center"], ["Monat", 2, 5, "u", "", "right", "center"], ["Tag", 2, 3, "u", "", "right", "center"], ["Belegnr", 5, 7, "s", "", "right", "center"], ["Bank", 2, 4, "u", "", "center", "center"], ["Art", 2, 3, "u", "", "center", "center"], ["Aufg", 2, 4, "u", "", "center", "center"], ["Text", 25, 25, "s", "-", "left", "left"], ["Ergänzung", 12, 12, "s", "-", "left", "left"], ["Betrag", 13, 13, "s", "", "right", "right"], ["W", 1, 2, "s", "", "center", "center"], ["WBetrag", 7, 7, "s", "", "right", "right"], ["Kurs", 6, 6, "s", "", "right", "right"], ] "Reihenfolge in der Dimension 1" ( fJAHR, fMONAT, fTAG, fBELEGNR, fBANK, fART, fAUFGABE, fTEXT, fTEXTERG, fBETRAG, fWAEHRUNG, fBETRAGinWAEHRUNG, fUMRECHNUNGSKURS, ) = list(range(13)) "Reihenfolge in der Dimension 2" ( fNAME, fLG1, fLG2, fTYP, fCONV_AUSRICHTG, fENTRY_AUSRICHTG, fTEXT_AUSRICHTUNG, fHOLFUNKT, fPRUEFFUNKT, fPRUEF_ARG, ) = list(range(10)) Two lines with test statements follow and the statement which produces an error: print(Felder) print(fJAHR, fNAME, fTYP, fCONV_AUSRICHTG) akette = "%" + "%".join( ["%s%s%s " % (i[fCONV_AUSRICHTG], i[fLG2], i[fTYP]) for i in Felder]) The traceback shows: $ python3 testGeldspurGUI.py [['Jahr', 4, 5, 'u', '', 'right', 'center'], ['Monat', 2, 5, 'u', '', 'right', 'center'], ['Tag', 2, 3, 'u', '', 'right', 'center'], ['Belegnr', 5, 7, 's', '', 'right', 'center'], ['Bank', 2, 4, 'u', '', 'center', 'center'], ['Art', 2, 3, 'u', '', 'center', 'center'], ['Aufg', 2, 4, 'u', '', 'center', 'center'], ['Text', 25, 25, 's', '-', 'left', 'left'], ['Ergänzung', 12, 12, 's', '-', 'left', 'left'], ['Betrag', 13, 13, 's', '', 'right', 'right'], ['W', 1, 2, 's', '', 'center', 'center'], ['WBetrag', 7, 7, 's', '', 'right', 'right'], ['Kurs', 6, 6, 's', '', 'right', 'right']] 0 0 3 4 Traceback (most recent call last): File "/home/egon/Entw/Geldspur/geldspur/testGeldspurGUI.py", line 15, in from tests.testU2 import testU2 File "/home/egon/Entw/Geldspur/geldspur/tests/testU2.py", line 9, in from gui.GUI_Konfig import GUIcfg File "/home/egon/Entw/Geldspur/geldspur/gui/GUI_Konfig.py", line 11, in class GUIcfg: File "/home/egon/Entw/Geldspur/geldspur/gui/GUI_Konfig.py", line 90, in GUIcfg ["%s%s%s " % (i[fCONV_AUSRICHTG], i[fLG2], i[fTYP]) for i in Felder]) File "/home/egon/Entw/Geldspur/geldspur/gui/GUI_Konfig.py", line 90, in ["%s%s%s " % (i[fCONV_AUSRICHTG], i[fLG2], i[fTYP]) for i in Felder]) NameError: name 'fCONV_AUSRICHTG' is not defined You see "Felder" and with "0 0 3 4" the correct value 4 for fCONV_AUSRICHTG. But there is the NameError. What does mean? Is there a change from python2 to python3? You are using a syntax that I don't understand, but "listcomp" means a list comprehenson. -- https://mail.python.org/mailman/listinfo/python-list
Clearing the Deque • Picturing Python’s `deque` data structure
You will be welcome to join us at our next (hybrid) meeting: Wednesday, 15 November 2023, 1815~2030 NZDT (0515~0730 UTC). How often do you use a deque*? “Not very” is a common answer. Perhaps you’ve never used it. In this presentation, Stephen won’t try to convince you to use it more often. Instead, he’ll present a different perspective on what this data structure is, and how it differs from a list. The presentation will compare deques and lists in a visual manner, to help us understand why we may need a deque in certain situations. We’ll also explore some demonstration examples to highlight the differences in performance between the two data structures in different scenarios. *pronounced like “deck" Audience: This presentation is ideal for those who have either never heard of deque, or have heard of it but never really used it or understood why it’s needed. The more experienced may find the visual story insightful. Stephen used to be a physicist, which is where he learned programming. After working in science and academia for over a decade, he decided to escape before it was too late. Since then, has focused exclusively on teaching coding and communicating about Python. A big part of his day is busy with running Codetoday—we teach Python coding to children between 7 and 16 years old (https://www.codetoday.co.uk/). He also runs courses for adults and corporate training programs, and particularly, writing about Python. He writes the articles he wished he had when learning. He publishes articles at The Python Coding Stack (https://thepythoncodingstack.substack.com/) and also wrote an online book (soon to be in other formats, too) for beginners, The Python Coding Book (https://thepythoncodingbook.com/). Please RSVP on Meetup.com (NZPUG Auckland Branch): https://www.meetup.com/nzpug-auckland/events/295433874/ -- Regards, =dn -- https://mail.python.org/mailman/listinfo/python-list
Re: Python Golf
On 2023-11-07, wrote: > Discussions like this feel a bit silly after a while. How long > something is to type on a command line is not a major issue and > brevity can lead to being hard to remember too especially using > obscure references. Of course it's silly, that's why it's called "golf"! It would be basically insane to use open(0) instead of sys.stdin like this except where the length of the source code overrides all other considerations - which is essentially never, unless playing code golf... -- https://mail.python.org/mailman/listinfo/python-list
Re: fCONV_AUSRICHTG is not defined - Why?
Where do you define fCONV_AUSRICHTG? It must be initialized or defined somewhere. Did you leave out a statement from the python 2 version? Sent from my iPhone > On Nov 7, 2023, at 1:06 PM, Thomas Passin via Python-list > wrote: > > On 11/7/2023 12:47 PM, Egon Frerich via Python-list wrote: >> I've no idea why this happens. In a module there are lists and definitions: >> Felder = [ >> # Name lg1 lg2 typ Ausrichtung Holen Prüfen Prüfvorg >> ["Jahr", 4, 5, "u", "", "right", "center"], >> ["Monat", 2, 5, "u", "", "right", "center"], >> ["Tag", 2, 3, "u", "", "right", "center"], >> ["Belegnr", 5, 7, "s", "", "right", "center"], >> ["Bank", 2, 4, "u", "", "center", "center"], >> ["Art", 2, 3, "u", "", "center", "center"], >> ["Aufg", 2, 4, "u", "", "center", "center"], >> ["Text", 25, 25, "s", "-", "left", "left"], >> ["Ergänzung", 12, 12, "s", "-", "left", "left"], >> ["Betrag", 13, 13, "s", "", "right", "right"], >> ["W", 1, 2, "s", "", "center", "center"], >> ["WBetrag", 7, 7, "s", "", "right", "right"], >> ["Kurs", 6, 6, "s", "", "right", "right"], >> ] >> "Reihenfolge in der Dimension 1" >> ( >> fJAHR, >> fMONAT, >> fTAG, >> fBELEGNR, >> fBANK, >> fART, >> fAUFGABE, >> fTEXT, >> fTEXTERG, >> fBETRAG, >> fWAEHRUNG, >> fBETRAGinWAEHRUNG, >> fUMRECHNUNGSKURS, >> ) = list(range(13)) >> "Reihenfolge in der Dimension 2" >> ( >> fNAME, >> fLG1, >> fLG2, >> fTYP, >> fCONV_AUSRICHTG, >> fENTRY_AUSRICHTG, >> fTEXT_AUSRICHTUNG, >> fHOLFUNKT, >> fPRUEFFUNKT, >> fPRUEF_ARG, >> ) = list(range(10)) >> Two lines with test statements follow and the statement which produces an >> error: >> print(Felder) >> print(fJAHR, fNAME, fTYP, fCONV_AUSRICHTG) >> akette = "%" + "%".join( >> ["%s%s%s " % (i[fCONV_AUSRICHTG], i[fLG2], i[fTYP]) for i in Felder]) >> The traceback shows: >> $ python3 testGeldspurGUI.py >> [['Jahr', 4, 5, 'u', '', 'right', 'center'], ['Monat', 2, 5, 'u', '', >> 'right', 'center'], ['Tag', 2, 3, 'u', '', 'right', 'center'], ['Belegnr', >> 5, 7, 's', '', 'right', 'center'], ['Bank', 2, 4, 'u', '', 'center', >> 'center'], ['Art', 2, 3, 'u', '', 'center', 'center'], ['Aufg', 2, 4, 'u', >> '', 'center', 'center'], ['Text', 25, 25, 's', '-', 'left', 'left'], >> ['Ergänzung', 12, 12, 's', '-', 'left', 'left'], ['Betrag', 13, 13, 's', '', >> 'right', 'right'], ['W', 1, 2, 's', '', 'center', 'center'], ['WBetrag', 7, >> 7, 's', '', 'right', 'right'], ['Kurs', 6, 6, 's', '', 'right', 'right']] >> 0 0 3 4 >> Traceback (most recent call last): >> File "/home/egon/Entw/Geldspur/geldspur/testGeldspurGUI.py", line 15, in >> >> from tests.testU2 import testU2 >> File "/home/egon/Entw/Geldspur/geldspur/tests/testU2.py", line 9, in >> >> from gui.GUI_Konfig import GUIcfg >> File "/home/egon/Entw/Geldspur/geldspur/gui/GUI_Konfig.py", line 11, in >> >> class GUIcfg: >> File "/home/egon/Entw/Geldspur/geldspur/gui/GUI_Konfig.py", line 90, in >> GUIcfg >> ["%s%s%s " % (i[fCONV_AUSRICHTG], i[fLG2], i[fTYP]) for i in Felder]) >> File "/home/egon/Entw/Geldspur/geldspur/gui/GUI_Konfig.py", line 90, in >> >> ["%s%s%s " % (i[fCONV_AUSRICHTG], i[fLG2], i[fTYP]) for i in Felder]) >> NameError: name 'fCONV_AUSRICHTG' is not defined >> You see "Felder" and with "0 0 3 4" the correct value 4 for fCONV_AUSRICHTG. >> But there is the NameError. >> What does mean? Is there a change from python2 to python3? > > You are using a syntax that I don't understand, but "listcomp" means a list > comprehenson. > > -- > https://mail.python.org/mailman/listinfo/python-list -- https://mail.python.org/mailman/listinfo/python-list
Re: fCONV_AUSRICHTG is not defined - Why?
On 2023-11-07 18:30, dn via Python-list wrote: On 08/11/2023 06.47, Egon Frerich via Python-list wrote: I've no idea why this happens. In a module there are lists and definitions: ... ["%s%s%s " % (i[fCONV_AUSRICHTG], i[fLG2], i[fTYP]) for i in Felder]) File "/home/egon/Entw/Geldspur/geldspur/gui/GUI_Konfig.py", line 90, in ["%s%s%s " % (i[fCONV_AUSRICHTG], i[fLG2], i[fTYP]) for i in Felder]) NameError: name 'fCONV_AUSRICHTG' is not defined You see "Felder" and with "0 0 3 4" the correct value 4 for fCONV_AUSRICHTG. But there is the NameError. What does mean? Is there a change from python2 to python3? Works for me (Python 3.11 on Fedora-Linux 37) - both as a script, and simple/single import. What happens when you extract the second dimension's definitions into a module of their own, and import that (with/out less-sophisticated join)? The missing detail is this line from the traceback: File "/home/egon/Entw/Geldspur/geldspur/gui/GUI_Konfig.py", line 11, in class GUIcfg: Here's a small example that shows the problem: 8< #!python3.11 # -*- encoding: utf-8 -*- class Test: hello = "hello" print(hello) print([[zero] for _ in range(4)]) 8< and its traceback: 8< hello Traceback (most recent call last): File "C:\Projects\regex3\test_clipboard.py", line 4, in class Test: File "C:\Projects\regex3\test_clipboard.py", line 7, in Test print([zero for _ in range(4)]) ^^ File "C:\Projects\regex3\test_clipboard.py", line 7, in print([zero for _ in range(4)]) NameError: name 'zero' is not defined 8< 'zero' is visible in: print(hello) but not in: print([zero for _ in range(4)]) Something to do with how scoping is implemented in comprehensions? -- https://mail.python.org/mailman/listinfo/python-list
Re: fCONV_AUSRICHTG is not defined - Why?
On 11/7/2023 12:47 PM, Egon Frerich via Python-list wrote: I've no idea why this happens. In a module there are lists and definitions: Felder = [ # Name lg1 lg2 typ Ausrichtung Holen Prüfen Prüfvorg ["Jahr", 4, 5, "u", "", "right", "center"], ["Monat", 2, 5, "u", "", "right", "center"], ["Tag", 2, 3, "u", "", "right", "center"], ["Belegnr", 5, 7, "s", "", "right", "center"], ["Bank", 2, 4, "u", "", "center", "center"], ["Art", 2, 3, "u", "", "center", "center"], ["Aufg", 2, 4, "u", "", "center", "center"], ["Text", 25, 25, "s", "-", "left", "left"], ["Ergänzung", 12, 12, "s", "-", "left", "left"], ["Betrag", 13, 13, "s", "", "right", "right"], ["W", 1, 2, "s", "", "center", "center"], ["WBetrag", 7, 7, "s", "", "right", "right"], ["Kurs", 6, 6, "s", "", "right", "right"], ] "Reihenfolge in der Dimension 1" ( fJAHR, fMONAT, fTAG, fBELEGNR, fBANK, fART, fAUFGABE, fTEXT, fTEXTERG, fBETRAG, fWAEHRUNG, fBETRAGinWAEHRUNG, fUMRECHNUNGSKURS, ) = list(range(13)) "Reihenfolge in der Dimension 2" ( fNAME, fLG1, fLG2, fTYP, fCONV_AUSRICHTG, fENTRY_AUSRICHTG, fTEXT_AUSRICHTUNG, fHOLFUNKT, fPRUEFFUNKT, fPRUEF_ARG, ) = list(range(10)) Two lines with test statements follow and the statement which produces an error: print(Felder) print(fJAHR, fNAME, fTYP, fCONV_AUSRICHTG) akette = "%" + "%".join( ["%s%s%s " % (i[fCONV_AUSRICHTG], i[fLG2], i[fTYP]) for i in Felder]) The traceback shows: $ python3 testGeldspurGUI.py [['Jahr', 4, 5, 'u', '', 'right', 'center'], ['Monat', 2, 5, 'u', '', 'right', 'center'], ['Tag', 2, 3, 'u', '', 'right', 'center'], ['Belegnr', 5, 7, 's', '', 'right', 'center'], ['Bank', 2, 4, 'u', '', 'center', 'center'], ['Art', 2, 3, 'u', '', 'center', 'center'], ['Aufg', 2, 4, 'u', '', 'center', 'center'], ['Text', 25, 25, 's', '-', 'left', 'left'], ['Ergänzung', 12, 12, 's', '-', 'left', 'left'], ['Betrag', 13, 13, 's', '', 'right', 'right'], ['W', 1, 2, 's', '', 'center', 'center'], ['WBetrag', 7, 7, 's', '', 'right', 'right'], ['Kurs', 6, 6, 's', '', 'right', 'right']] 0 0 3 4 Traceback (most recent call last): File "/home/egon/Entw/Geldspur/geldspur/testGeldspurGUI.py", line 15, in from tests.testU2 import testU2 File "/home/egon/Entw/Geldspur/geldspur/tests/testU2.py", line 9, in from gui.GUI_Konfig import GUIcfg File "/home/egon/Entw/Geldspur/geldspur/gui/GUI_Konfig.py", line 11, in class GUIcfg: File "/home/egon/Entw/Geldspur/geldspur/gui/GUI_Konfig.py", line 90, in GUIcfg ["%s%s%s " % (i[fCONV_AUSRICHTG], i[fLG2], i[fTYP]) for i in Felder]) File "/home/egon/Entw/Geldspur/geldspur/gui/GUI_Konfig.py", line 90, in ["%s%s%s " % (i[fCONV_AUSRICHTG], i[fLG2], i[fTYP]) for i in Felder]) NameError: name 'fCONV_AUSRICHTG' is not defined You see "Felder" and with "0 0 3 4" the correct value 4 for fCONV_AUSRICHTG. But there is the NameError. What does mean? Is there a change from python2 to python3? You are using a syntax that I don't understand, but "listcomp" means a list comprehenson. -- https://mail.python.org/mailman/listinfo/python-list
RE: Writing to clipboard in Python 3.11
It doesn't work in python 3.12.0
-Original Message-
From: Python-list On
Behalf Of Thomas Passin via Python-list
Sent: Tuesday, November 7, 2023 12:08 PM
To: python-list@python.org
Subject: Re: Writing to clipboard in Python 3.11
On 11/5/2023 7:51 PM, Rob Cliffe via Python-list wrote:
> Recently I switched from Python 3.8.3 to Python 3.11.4. A strange
> problem appeared which was not there before:
> I am using the win32clipboard backage (part of pywin32), and when I
> use
> SetClipboardData() to write text which consists ENTIRELY OF DIGITS to
> the clipboard, I either get an error (not always the same error
> message) or a program crash. The problem does not appear if I use
> SetClipboardText() instead.
> Sample program:
>
> from win32clipboard import *
> OpenClipboard()
> SetClipboardData(CF_UNICODETEXT, "A")
> SetClipboardData(CF_UNICODETEXT, "A0")
> SetClipboardData(CF_UNICODETEXT, "0A") SetClipboardText("0",
> CF_UNICODETEXT) print("OK so far") SetClipboardData(CF_UNICODETEXT,
> "0")
> CloseClipboard()
>
> Sample output:
>
> OK so far
> Traceback (most recent call last):
>File "R:\W.PY", line 8, in
> SetClipboardData(CF_UNICODETEXT, "0")
> pywintypes.error: (0, 'SetClipboardData', 'No error message is
> available')
>
> I can get round the problem by using SetClipboardText(). But can
> anyone shed light on this?
No, but I use pyperclip. It's cross platform. Maybe it doesn't have this
problem, though I don't know for sure.
--
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--
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Re: fCONV_AUSRICHTG is not defined - Why?
On 08/11/2023 06.47, Egon Frerich via Python-list wrote: I've no idea why this happens. In a module there are lists and definitions: ... ["%s%s%s " % (i[fCONV_AUSRICHTG], i[fLG2], i[fTYP]) for i in Felder]) File "/home/egon/Entw/Geldspur/geldspur/gui/GUI_Konfig.py", line 90, in ["%s%s%s " % (i[fCONV_AUSRICHTG], i[fLG2], i[fTYP]) for i in Felder]) NameError: name 'fCONV_AUSRICHTG' is not defined You see "Felder" and with "0 0 3 4" the correct value 4 for fCONV_AUSRICHTG. But there is the NameError. What does mean? Is there a change from python2 to python3? Works for me (Python 3.11 on Fedora-Linux 37) - both as a script, and simple/single import. What happens when you extract the second dimension's definitions into a module of their own, and import that (with/out less-sophisticated join)? -- Regards, =dn -- https://mail.python.org/mailman/listinfo/python-list
Re: Writing to clipboard in Python 3.11
On 11/5/2023 7:51 PM, Rob Cliffe via Python-list wrote:
Recently I switched from Python 3.8.3 to Python 3.11.4. A strange
problem appeared which was not there before:
I am using the win32clipboard backage (part of pywin32), and when I use
SetClipboardData() to write text which consists ENTIRELY OF DIGITS to
the clipboard, I either get an error (not always the same error message)
or a program crash. The problem does not appear if I use
SetClipboardText() instead.
Sample program:
from win32clipboard import *
OpenClipboard()
SetClipboardData(CF_UNICODETEXT, "A")
SetClipboardData(CF_UNICODETEXT, "A0")
SetClipboardData(CF_UNICODETEXT, "0A")
SetClipboardText("0", CF_UNICODETEXT)
print("OK so far")
SetClipboardData(CF_UNICODETEXT, "0")
CloseClipboard()
Sample output:
OK so far
Traceback (most recent call last):
File "R:\W.PY", line 8, in
SetClipboardData(CF_UNICODETEXT, "0")
pywintypes.error: (0, 'SetClipboardData', 'No error message is available')
I can get round the problem by using SetClipboardText(). But can anyone
shed light on this?
No, but I use pyperclip. It's cross platform. Maybe it doesn't have
this problem, though I don't know for sure.
--
https://mail.python.org/mailman/listinfo/python-list
fCONV_AUSRICHTG is not defined - Why?
I've no idea why this happens. In a module there are lists and definitions: Felder = [ # Name lg1 lg2 typ Ausrichtung Holen Prüfen Prüfvorg ["Jahr", 4, 5, "u", "", "right", "center"], ["Monat", 2, 5, "u", "", "right", "center"], ["Tag", 2, 3, "u", "", "right", "center"], ["Belegnr", 5, 7, "s", "", "right", "center"], ["Bank", 2, 4, "u", "", "center", "center"], ["Art", 2, 3, "u", "", "center", "center"], ["Aufg", 2, 4, "u", "", "center", "center"], ["Text", 25, 25, "s", "-", "left", "left"], ["Ergänzung", 12, 12, "s", "-", "left", "left"], ["Betrag", 13, 13, "s", "", "right", "right"], ["W", 1, 2, "s", "", "center", "center"], ["WBetrag", 7, 7, "s", "", "right", "right"], ["Kurs", 6, 6, "s", "", "right", "right"], ] "Reihenfolge in der Dimension 1" ( fJAHR, fMONAT, fTAG, fBELEGNR, fBANK, fART, fAUFGABE, fTEXT, fTEXTERG, fBETRAG, fWAEHRUNG, fBETRAGinWAEHRUNG, fUMRECHNUNGSKURS, ) = list(range(13)) "Reihenfolge in der Dimension 2" ( fNAME, fLG1, fLG2, fTYP, fCONV_AUSRICHTG, fENTRY_AUSRICHTG, fTEXT_AUSRICHTUNG, fHOLFUNKT, fPRUEFFUNKT, fPRUEF_ARG, ) = list(range(10)) Two lines with test statements follow and the statement which produces an error: print(Felder) print(fJAHR, fNAME, fTYP, fCONV_AUSRICHTG) akette = "%" + "%".join( ["%s%s%s " % (i[fCONV_AUSRICHTG], i[fLG2], i[fTYP]) for i in Felder]) The traceback shows: $ python3 testGeldspurGUI.py [['Jahr', 4, 5, 'u', '', 'right', 'center'], ['Monat', 2, 5, 'u', '', 'right', 'center'], ['Tag', 2, 3, 'u', '', 'right', 'center'], ['Belegnr', 5, 7, 's', '', 'right', 'center'], ['Bank', 2, 4, 'u', '', 'center', 'center'], ['Art', 2, 3, 'u', '', 'center', 'center'], ['Aufg', 2, 4, 'u', '', 'center', 'center'], ['Text', 25, 25, 's', '-', 'left', 'left'], ['Ergänzung', 12, 12, 's', '-', 'left', 'left'], ['Betrag', 13, 13, 's', '', 'right', 'right'], ['W', 1, 2, 's', '', 'center', 'center'], ['WBetrag', 7, 7, 's', '', 'right', 'right'], ['Kurs', 6, 6, 's', '', 'right', 'right']] 0 0 3 4 Traceback (most recent call last): File "/home/egon/Entw/Geldspur/geldspur/testGeldspurGUI.py", line 15, in from tests.testU2 import testU2 File "/home/egon/Entw/Geldspur/geldspur/tests/testU2.py", line 9, in from gui.GUI_Konfig import GUIcfg File "/home/egon/Entw/Geldspur/geldspur/gui/GUI_Konfig.py", line 11, in class GUIcfg: File "/home/egon/Entw/Geldspur/geldspur/gui/GUI_Konfig.py", line 90, in GUIcfg ["%s%s%s " % (i[fCONV_AUSRICHTG], i[fLG2], i[fTYP]) for i in Felder]) File "/home/egon/Entw/Geldspur/geldspur/gui/GUI_Konfig.py", line 90, in ["%s%s%s " % (i[fCONV_AUSRICHTG], i[fLG2], i[fTYP]) for i in Felder]) NameError: name 'fCONV_AUSRICHTG' is not defined You see "Felder" and with "0 0 3 4" the correct value 4 for fCONV_AUSRICHTG. But there is the NameError. What does mean? Is there a change from python2 to python3? Egon -- https://mail.python.org/mailman/listinfo/python-list
RE: Checking if email is valid
Text messages have taken a nasty turn and especially now that so many people have unlimited messages per month in their plan. People overuse them to the point where I opt out of some things like my home town notifications as they bombard me with other things I am not interested in. A major offender now is various forms of security which insist on not letting you into a web site for your bank or other resources unless they first send you an email or text message or perhaps a voice call with random digits to use as verification. Try sitting somewhere with your phone muted as all the beeps get annoying. There are many reasons for preferences and I know many people find it harder to reply to texts on their phone than to emails on a PC with a full keyboard. But all of this is not really here or there. We are talking more about user interface design than about programming, let alone about Python. What strikes me as a useful direction is for people to suggest what resources and methods in the Python world are helpful. Examples would be modules that have been tested and used that do things well such as validating phone numbers or emails, perhaps flexibly so that if a validation fails, they prompt the user asking if they are sure it is correct and maybe offer to let them type it in again for verification. Other ideas as stated recently are routines that don't just ask for a number but specify the purpose, and perhaps messages about what circumstances would trigger a use of the number, such as if fraud is detected, and get you to opt in or refuse. Reusable libraries of sorts, or good documentation of examples, would perhaps help make User Interface design and customer satisfaction better and show Python as a good way to do some kinds of programs. In that light, I wonder if it makes sense to NOT insist people give you their email address at all, and make it optional so they do not need to provide you with something bogus just to go on. -Original Message- From: Python-list On Behalf Of D'Arcy Cain via Python-list Sent: Tuesday, November 7, 2023 11:24 AM To: python-list@python.org Subject: Re: Checking if email is valid On 2023-11-07 08:40, Grant Edwards via Python-list wrote: > If you, as a web developer, want the user to enter a text-message > capable phone number, then ASK FOR THAT! And you may as well ask if they even want you to send texts whether they can technically receive them or not. -- D'Arcy J.M. Cain Vybe Networks Inc. http://www.VybeNetworks.com/ IM:da...@vex.net VoIP: sip:da...@vybenetworks.com -- https://mail.python.org/mailman/listinfo/python-list -- https://mail.python.org/mailman/listinfo/python-list
RE: Python Golf
Discussions like this feel a bit silly after a while. How long something is
to type on a command line is not a major issue and brevity can lead to being
hard to remember too especially using obscure references.
Consider that the Perl version as shown below does not need to import
anything. If you had python import sys by default and perhaps even create a
briefer alias for sys.stdin, then this gets shorter:
py -c "import sys; print(sum(int(F.split()[1])for F in sys.stdin))" On
Behalf Of Jon Ribbens via Python-list
Sent: Tuesday, November 7, 2023 11:06 AM
To: python-list@python.org
Subject: Re: Python Golf
On 2023-11-07, Stefan Ram wrote:
> I read this in a shell newsgroup:
>
> perl -anE '$s += $F[1]; END {say $s}' in
>
> , so I wrote
>
> py -c "import sys; print(sum(int(F.split()[1])for F in sys.stdin))"
> to show that this is possible with Python too.
>
> But now people complain that it's longer than the Perl version.
>
> Do you see ways to make it shorter (beyond removing one space
> after the semicolon ";")?
It's a bit of an unfair competition given that, unlike Perl,
Python is not designed to be an 'awk' replacement.
Having said that, you could make it a bit shorter:
py -c "print(sum(int(F.split()[1])for F in open(0)))" https://mail.python.org/mailman/listinfo/python-list
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Re: Writing to clipboard in Python 3.11
On 2023-11-06 00:51, Rob Cliffe via Python-list wrote:
Recently I switched from Python 3.8.3 to Python 3.11.4. A strange
problem appeared which was not there before:
I am using the win32clipboard backage (part of pywin32), and when I use
SetClipboardData() to write text which consists ENTIRELY OF DIGITS to
the clipboard, I either get an error (not always the same error message)
or a program crash. The problem does not appear if I use
SetClipboardText() instead.
Sample program:
from win32clipboard import *
OpenClipboard()
SetClipboardData(CF_UNICODETEXT, "A")
SetClipboardData(CF_UNICODETEXT, "A0")
SetClipboardData(CF_UNICODETEXT, "0A")
SetClipboardText("0", CF_UNICODETEXT)
print("OK so far")
SetClipboardData(CF_UNICODETEXT, "0")
CloseClipboard()
Sample output:
OK so far
Traceback (most recent call last):
File "R:\W.PY", line 8, in
SetClipboardData(CF_UNICODETEXT, "0")
pywintypes.error: (0, 'SetClipboardData', 'No error message is available')
I can get round the problem by using SetClipboardText(). But can anyone
shed light on this?
It also happens in Python 3.10, but not Python 3.9.
--
https://mail.python.org/mailman/listinfo/python-list
Writing to clipboard in Python 3.11
Recently I switched from Python 3.8.3 to Python 3.11.4. A strange
problem appeared which was not there before:
I am using the win32clipboard backage (part of pywin32), and when I use
SetClipboardData() to write text which consists ENTIRELY OF DIGITS to
the clipboard, I either get an error (not always the same error message)
or a program crash. The problem does not appear if I use
SetClipboardText() instead.
Sample program:
from win32clipboard import *
OpenClipboard()
SetClipboardData(CF_UNICODETEXT, "A")
SetClipboardData(CF_UNICODETEXT, "A0")
SetClipboardData(CF_UNICODETEXT, "0A")
SetClipboardText("0", CF_UNICODETEXT)
print("OK so far")
SetClipboardData(CF_UNICODETEXT, "0")
CloseClipboard()
Sample output:
OK so far
Traceback (most recent call last):
File "R:\W.PY", line 8, in
SetClipboardData(CF_UNICODETEXT, "0")
pywintypes.error: (0, 'SetClipboardData', 'No error message is available')
I can get round the problem by using SetClipboardText(). But can anyone
shed light on this?
Best wishes
Rob Cliffe
--
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Re: Checking if email is valid
On 2023-11-07 08:40, Grant Edwards via Python-list wrote: If you, as a web developer, want the user to enter a text-message capable phone number, then ASK FOR THAT! And you may as well ask if they even want you to send texts whether they can technically receive them or not. -- D'Arcy J.M. Cain Vybe Networks Inc. http://www.VybeNetworks.com/ IM:da...@vex.net VoIP: sip:da...@vybenetworks.com -- https://mail.python.org/mailman/listinfo/python-list
Re: Python Golf
On 2023-11-07, Stefan Ram wrote:
> I read this in a shell newsgroup:
>
> perl -anE '$s += $F[1]; END {say $s}' in
>
> , so I wrote
>
> py -c "import sys; print(sum(int(F.split()[1])for F in sys.stdin))"
> to show that this is possible with Python too.
>
> But now people complain that it's longer than the Perl version.
>
> Do you see ways to make it shorter (beyond removing one space
> after the semicolon ";")?
It's a bit of an unfair competition given that, unlike Perl,
Python is not designed to be an 'awk' replacement.
Having said that, you could make it a bit shorter:
py -c "print(sum(int(F.split()[1])for F in open(0)))" https://mail.python.org/mailman/listinfo/python-list
Re: Checking if email is valid
On 2023-11-06, Greg Ewing via Python-list wrote: > On 7/11/23 7:45 am, Mats Wichmann wrote: >> Continuing with the example, if you have a single phone number field, or >> let a mobile number be entered in a field marked for landline, you will >> probably assume you can text to that number. > > But if the site can detect that you've entered a mobile number into > the landline field or vice versa and reject it, then it can figure out > whether it can text to a given numner or not without you having > to tell it! Maybe. I'm pretty sure the last time I was in Australia, you could send/recieve text messages from landalines. And I've had mobile number that didn't support text messaging. If you, as a web developer, want the user to enter a text-message capable phone number, then ASK FOR THAT! -- https://mail.python.org/mailman/listinfo/python-list
Re: Detect naming typos (AttributeError) in function names
On 11/7/2023 2:48 AM, Christian Buhtz via Python-list wrote: Hello Dieter, thanks for your reply. Am 06.11.2023 19:11 schrieb Dieter Maurer: One option is a test suite (--> Python's "unittest" package) with a sufficiently high coverage (near 100 %). Yes, that is the primary goal. But it is far away in the related project. I got a hint that "pylint" is able to detect problems like this. mypy can detect typos in names by noticing that they haven't been declared. For example, if you have a class NewClass(BaseClass), and BaseClass has a method findme(), but you call it as findMe(), mypy will tell you findMe does not exist in BaseClass. It can be annoying to get the options set right so you don't get too many undesired hits, but it's certainly doable. mypy can be slow, depending on your code. You could also simply run py_compile, which will try to compile the code. It will stop at the first error it finds. -- https://mail.python.org/mailman/listinfo/python-list
Aw: Re: pip/pip3 confusion and keeping up to date
> > .From all the posts I gather the answer to my question is > > "simply": unpackaged-but-needed modules need to be packaged. > > I think there is one aspect that isn't getting consideration here. And > that is whether or not you want these packages installed in the default > system Python install. You might not. Indeed, which is why all the fuzz about how to fill-in a venv from pip while installing with apt :-) With "properly" packaged modules one wouldn't risk (that much) system breakage, at any rate. > Maybe you want to get the latest > possible version of super-dooper-gui-helper, but one of its dependencies > doesn't play well with the system Python libraries. Or ... but you get > the point. There are probably many cases where you want *not* to > install into the system Python world. So you would need to come up with > an APT-based installer that doesn't do that. > > Obviously it's not unthinkable; Certainly not, it's just that I had hoped someone goes: look here and all of this ... > it is just one more thing to figure out. ... has been thought through before. Thanks, Karsten -- https://mail.python.org/mailman/listinfo/python-list
