Re: "py" command for Linux and Mac?
On 2022-05-12, Mats Wichmann wrote: > On 5/12/22 10:25, Dan Stromberg wrote: >> Hi folks. >> >> I heard there's a Windows-like "py" command for Linux (and Mac?). >> >> I'm finally getting to porting a particular project's Python 2.7 code to >> 3.x, and one of the first steps will probably be changing a lot of "python2 >> script.py" to use #!/usr/bin/env python2 and chmod +x. Then we can update >> the scripts one at a time to use #!/usr/bin/env python3. >> >> However, would this be Linux-and-Mac-only? I'm not at all sure this code >> will ever move to Windows, but in case it does, would a "py" command work >> on all 3 if I use #!/usr/bin/env py? > > The py command (python lanucher) respects shebang lines. Linux by itself respects shebang lines, so you don't need a separate launcher program. Just put e.g.: #! /usr/bin/env python at the top of your Python file. -- In the beginning there was darkness and the darkness was without form and void. And in addition to the darkness there was also me. And I moved upon the face of the darkness and I saw that I was alone. ... ... ... Let there be light. [Bomb 20; John Carpenter's Dark Star - 1974] -- https://mail.python.org/mailman/listinfo/python-list
Re: How to test characters of a string
On 2022-06-07, Dave wrote: > Hi, > > I’m new to Python and have a simple problem that I can’t seem to find the > answer. > > I want to test the first two characters of a string to check if the are > numeric (00 to 99) and if so remove the fist three chars from the string. > > Example: if “05 Trinket” I want “Trinket”, but “Trinket” I still want > “Trinket”. I can’t for the life of work out how to do it in Python? s[3:] if s[0:2].isdigit() else s > All the Best > Dave > -- You're rewriting parts of Quake in *Python*? MUAHAHAHA -- https://mail.python.org/mailman/listinfo/python-list
Re: How to test characters of a string
On 2022-06-07, Stefan Ram wrote: > Dave writes: >>Example: if "05 Trinket" I want "Trinket" > > We're not supposed to write complete solutions, Okay, wasn't aware of this group policy; will keep it in mind. -- You're rewriting parts of Quake in *Python*? MUAHAHAHA -- https://mail.python.org/mailman/listinfo/python-list
Re: How to test characters of a string
On 2022-06-07, Dave wrote:
> Thanks a lot for this! isDigit was the method I was looking for and couldn’t
> find.
>
> I have another problem related to this, the following code uses the code you
> just sent. I am getting a files ID3 tags using eyed3, this part seems to work
> and I get expected values in this case myTitleName (Track name) is set to
> “Deadlock Holiday” and myCompareFileName is set to “01 Deadlock Holiday”
> (File Name with the Track number prepended). The is digit test works and
> myCompareFileName is set to “Deadlock Holiday”, so they should match, right?
>
> However the if myCompareFileName != myTitleName always gives a mismatch! What
> could cause two string that look the fail to not match properly?
Possibly leading or trailing spaces, or upper/lower case differences?
> myCompareFileName = myFile
> if myCompareFileName[0].isdigit() and myCompareFileName[1].isdigit():
> myCompareFileName = myCompareFileName[3:]
>
> if myCompareFileName != myTitleName:
> print('File Name Mismatch - Artist: ',myArtistName,' Album:
> ',myAlbumName,' Track:',myTitleName,' File: ',myFile)
> Thanks a lot
> Dave
>
>> On 7 Jun 2022, at 21:58, De ongekruisigde
>> wrote:
>>
>> On 2022-06-07, Dave wrote:
>>> Hi,
>>>
>>> I’m new to Python and have a simple problem that I can’t seem to find the
>>> answer.
>>>
>>> I want to test the first two characters of a string to check if the are
>>> numeric (00 to 99) and if so remove the fist three chars from the string.
>>>
>>> Example: if “05 Trinket” I want “Trinket”, but “Trinket” I still want
>>> “Trinket”. I can’t for the life of work out how to do it in Python?
>>
>>
>> s[3:] if s[0:2].isdigit() else s
>>
>>
>>> All the Best
>>> Dave
>>>
>>
>> --
>> You're rewriting parts of Quake in *Python*?
>> MUAHAHAHA
>> --
>> https://mail.python.org/mailman/listinfo/python-list
>
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Re: How to test characters of a string
On 2022-06-08, Christian Gollwitzer wrote: > Am 07.06.22 um 21:56 schrieb Dave: >> It depends on the language I’m using, in Objective C, I’d use isNumeric, >> just wanted to know what the equivalent is in Python. >> > > Your problem is also a typical case for regular expressions. You can > create an expression for "starts with any number of digits plus optional > whitespace" and then replace this with nothing: Regular expressions are overkill for this and much slower than the simple isdigit based solution. >> chris@linux-tb9f:~> ipython >> Python 3.6.15 (default, Sep 23 2021, 15:41:43) [GCC] >> Type 'copyright', 'credits' or 'license' for more information >> IPython 7.13.0 -- An enhanced Interactive Python. Type '?' for help. >> >> In [1]: import re >> >> >> >> In [2]: s='05 Trinket' >> >> >> >> In [3]: re.sub(r'^\d+\s*', '', s) >> >> >> Out[3]: 'Trinket' >> > > If it doesn't match, it will do nothing: > >> In [4]: s='Es geht los' >> >> >> >> In [5]: re.sub(r'^\d+\s*', '', s) >> >> >> Out[5]: 'Es geht los' > > Some people on this list don't like regexes but for tasks like this they > are made and working well. Regular expressions are indeeed extremely powerful and useful but I tend to avoid them when there's a (faster) normal solution. > ^ is "starts with" > \d is any digit > \s is any space > + is at least one > * is nothing or one of > > Christian -- You're rewriting parts of Quake in *Python*? MUAHAHAHA -- https://mail.python.org/mailman/listinfo/python-list
Re: How to replace characters in a string?
On 2022-06-08, Dave wrote: > Hi All, > > I decided to start a new thread as this really is a new subject. > > I've got two that appear to be identical, but fail to compare. After getting > the ascii encoding I see that they are indeed different, my question is how > can I replace the \u2019m with a regular single quote mark (or apostrophe)? You're not facing this alone: https://changelog.complete.org/archives/9938-the-python-unicode-mess Perhaps useful insights can be found at: https://realpython.com/python-encodings-guide/ > +++ -- You're rewriting parts of Quake in *Python*? MUAHAHAHA -- https://mail.python.org/mailman/listinfo/python-list
Re: How to test characters of a string
On 2022-06-08, dn wrote:
> On 08/06/2022 10.18, De ongekruisigde wrote:
>> On 2022-06-08, Christian Gollwitzer wrote:
>>> Am 07.06.22 um 21:56 schrieb Dave:
>>>> It depends on the language I’m using, in Objective C, I’d use isNumeric,
>>>> just wanted to know what the equivalent is in Python.
>>>>
>>>
>>> Your problem is also a typical case for regular expressions. You can
>>> create an expression for "starts with any number of digits plus optional
>>> whitespace" and then replace this with nothing:
>>
>> Regular expressions are overkill for this and much slower than the
>> simple isdigit based solution.
>
> ...
>
>> Regular expressions are indeeed extremely powerful and useful but I tend
>> to avoid them when there's a (faster) normal solution.
>
> Yes, simple solutions are (likely) easier to read.
Depending on the problem a regular expression may be the much simpler
solution. I love them for e.g. text parsing and use them all the time.
Unrivaled when e.g. parts of text have to be extracted, e.g. from lines
like these:
root:x:0:0:System administrator:/root:/run/current-system/sw/bin/bash
dhcpcd:x:995:991::/var/empty:/run/current-system/sw/bin/nologin
nm-iodine:x:996:57::/var/empty:/run/current-system/sw/bin/nologin
avahi:x:997:996:avahi-daemon privilege separation
user:/var/empty:/run/current-system/sw/bin/nologin
sshd:x:998:993:SSH privilege separation
user:/var/empty:/run/current-system/sw/bin/nologin
geoclue:x:999:998:Geoinformation
service:/var/lib/geoclue:/run/current-system/sw/bin/nologin
Compare a regexp solution like this:
>>> g = re.search(r'([^:]*):([^:]*):(\d+):(\d+):([^:]*):([^:]*):(.*)$' , s)
>>> print(g.groups())
('geoclue', 'x', '999', '998', 'Geoinformation service', '/var/lib/geoclue',
'/run/current-system/sw/bin/nologin')
to the code one would require to process it manually, with all the edge
cases. The regexp surely reads much simpler (?).
> RegEx-s are more powerful (and well worth learning for this reason), but
> are only 'readable' to those who use them frequently.
>
> Has either of you performed a timeit comparison?
No need: the isdigit solution doesn't require the overhead of a regex
processor.
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Re: How to test characters of a string
On 2022-06-08, Dave wrote: > I hate regEx and avoid it whenever possible, I’ve never found something that > was impossible to do without it. I love regular expressions and use them where appropriate. Saves tons of code and is often much more readable than the pages of code required to do the same. -- You're rewriting parts of Quake in *Python*? MUAHAHAHA -- https://mail.python.org/mailman/listinfo/python-list
Re: How to test characters of a string
On 2022-06-08, Christian Gollwitzer wrote:
> Am 07.06.22 um 23:01 schrieb Christian Gollwitzer:
>
>>> In [3]: re.sub(r'^\d+\s*', '', s) Out[3]: 'Trinket'
>>>
>
> that RE does match what you intended to do, but not exactly what you
> wrote in the OP. that would be '^\d\d.' start with exactly two digits
> followed by any character.
Indeed but then I'd like '\d{2}' even better.
> Christian
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Re: How to test characters of a string
On 2022-06-08, 2qdxy4rzwzuui...@potatochowder.com
<2qdxy4rzwzuui...@potatochowder.com> wrote:
> On 2022-06-08 at 08:07:40 -0000,
> De ongekruisigde wrote:
>
>> Depending on the problem a regular expression may be the much simpler
>> solution. I love them for e.g. text parsing and use them all the time.
>> Unrivaled when e.g. parts of text have to be extracted, e.g. from lines
>> like these:
>>
>> root:x:0:0:System administrator:/root:/run/current-system/sw/bin/bash
>> dhcpcd:x:995:991::/var/empty:/run/current-system/sw/bin/nologin
>> nm-iodine:x:996:57::/var/empty:/run/current-system/sw/bin/nologin
>> avahi:x:997:996:avahi-daemon privilege separation
>> user:/var/empty:/run/current-system/sw/bin/nologin
>> sshd:x:998:993:SSH privilege separation
>> user:/var/empty:/run/current-system/sw/bin/nologin
>> geoclue:x:999:998:Geoinformation
>> service:/var/lib/geoclue:/run/current-system/sw/bin/nologin
>>
>> Compare a regexp solution like this:
>>
>> >>> g = re.search(r'([^:]*):([^:]*):(\d+):(\d+):([^:]*):([^:]*):(.*)$' , s)
>> >>> print(g.groups())
>> ('geoclue', 'x', '999', '998', 'Geoinformation service',
>> '/var/lib/geoclue', '/run/current-system/sw/bin/nologin')
>>
>> to the code one would require to process it manually, with all the edge
>> cases. The regexp surely reads much simpler (?).
>
> Uh...
>
> >>> import pwd # https://docs.python.org/3/library/pwd.html
> >>> [x for x in pwd.getpwall() if x[0] == 'geoclue']
> [pwd.struct_passwd(pw_name='geoclue', pw_passwd='x', pw_uid=992,
> pw_gid=992, pw_gecos='Geoinformation service', pw_dir='/var/lib/geoclue',
> pw_shell='/sbin/nologin')]
Yeah... Well, it was just an example and it must be clear by now I'm not
a Python programmer.
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Re: How to test characters of a string
On 2022-06-08, 2qdxy4rzwzuui...@potatochowder.com
<2qdxy4rzwzuui...@potatochowder.com> wrote:
> On 2022-06-09 at 04:15:46 +1000,
> Chris Angelico wrote:
>
>> On Thu, 9 Jun 2022 at 04:14, <2qdxy4rzwzuui...@potatochowder.com> wrote:
>> >
>> > On 2022-06-09 at 03:18:56 +1000,
>> > Chris Angelico wrote:
>> >
>> > > On Thu, 9 Jun 2022 at 03:15, <2qdxy4rzwzuui...@potatochowder.com> wrote:
>> > > >
>> > > > On 2022-06-08 at 08:07:40 -,
>> > > > De ongekruisigde wrote:
>> > > >
>> > > > > Depending on the problem a regular expression may be the much simpler
>> > > > > solution. I love them for e.g. text parsing and use them all the
>> > > > > time.
>> > > > > Unrivaled when e.g. parts of text have to be extracted, e.g. from
>> > > > > lines
>> > > > > like these:
>> > > > >
>> > > > > root:x:0:0:System
>> > > > > administrator:/root:/run/current-system/sw/bin/bash
>> > > > > dhcpcd:x:995:991::/var/empty:/run/current-system/sw/bin/nologin
>> > > > > nm-iodine:x:996:57::/var/empty:/run/current-system/sw/bin/nologin
>> > > > > avahi:x:997:996:avahi-daemon privilege separation
>> > > > > user:/var/empty:/run/current-system/sw/bin/nologin
>> > > > > sshd:x:998:993:SSH privilege separation
>> > > > > user:/var/empty:/run/current-system/sw/bin/nologin
>> > > > > geoclue:x:999:998:Geoinformation
>> > > > > service:/var/lib/geoclue:/run/current-system/sw/bin/nologin
>> > > > >
>> > > > > Compare a regexp solution like this:
>> > > > >
>> > > > > >>> g =
>> > > > > re.search(r'([^:]*):([^:]*):(\d+):(\d+):([^:]*):([^:]*):(.*)$' , s)
>> > > > > >>> print(g.groups())
>> > > > > ('geoclue', 'x', '999', '998', 'Geoinformation service',
>> > > > > '/var/lib/geoclue', '/run/current-system/sw/bin/nologin')
>> > > > >
>> > > > > to the code one would require to process it manually, with all the
>> > > > > edge
>> > > > > cases. The regexp surely reads much simpler (?).
>> > > >
>> > > > Uh...
>> > > >
>> > > > >>> import pwd # https://docs.python.org/3/library/pwd.html
>> > > > >>> [x for x in pwd.getpwall() if x[0] == 'geoclue']
>> > > > [pwd.struct_passwd(pw_name='geoclue', pw_passwd='x', pw_uid=992,
>> > > > pw_gid=992, pw_gecos='Geoinformation service',
>> > > > pw_dir='/var/lib/geoclue', pw_shell='/sbin/nologin')]
>> > >
>> > > That's great if the lines are specifically coming from your system's
>> > > own /etc/passwd, but not so much if you're trying to compare passwd
>> > > files from different systems, where you simply have the files
>> > > themselves.
>> >
>> > In addition to pwent to get specific entries from the local password
>> > database, POSIX has fpwent to get a specific entry from a stream that
>> > looks like /etc/passwd. So even POSIX agrees that if you think you have
>> > to process this data manually, you're doing it wrong. Python exposes
>> > neither functon directly (at least not in the pwd module or the os
>> > module; I didn't dig around or check PyPI).
>>
>> So.. we can go find some other way of calling fpwent, or we can
>> just parse the file ourselves. It's a very VERY simple format.
>
> If you insist:
>
> >>> s =
> 'nm-iodine:x:996:57::/var/empty:/run/current-system/sw/bin/nologin'
> >>> print(s.split(':'))
> ['nm-iodine', 'x', '996', '57', '', '/var/empty',
> '/run/current-system/sw/bin/nologin']
>
> Hesitantly, because this is the Python mailing list, I claim (a) ':' is
> simpler than r'([^:]*):([^:]*):(\d+):(\d+):([^:]*):([^:]*):(.*)$', and
> (b) string.split covers pretty much the same edge cases as re.search.
Ah, but you don't catch the be numeric of fields (0-based) 2 and 3! But
agreed, it's not the best of examples.
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Re: WHAT THE ERROR ON MY CODE???
On 2022-06-28, Chris Angelico wrote: > On Wed, 29 Jun 2022 at 01:37, נתי שטרן wrote: >> headers["Authorization"] = "Basic >> YjMwMzcwODY3NTUzNDMwNTg5NzA2MjkyNDFmMDE1YWY6VjNKYTk2Y1F4RTFzeTdYbzRnbkt0a2k1djhscXUyU01oSE5VWUwwRg==" >> > > The error is that you just revealed your credentials to the whole > world. This is a public mailing list. > > In fact, you just revealed your credentials to TWO mailing lists at once. I think the term 'script kiddie' applies here. > Good job. > > ChrisA -- Without followers, evil cannot spread. [Spock, "And The Children Shall Lead", stardate 5029.5] -- https://mail.python.org/mailman/listinfo/python-list
Re: Simple webserver
On 2023-10-20, Chris Angelico wrote:
> On Fri, 20 Oct 2023 at 22:31, Janis Papanagnou via Python-list
> wrote:
>>
>> On 19.10.2023 01:23, Chris Angelico wrote:
>> >
>> > Broadly speaking, your ideas are great. Any programming language CAN
>> > be used for the server (and I've used several, not just Python).
>>
>> Out of curiosity; what where these languages? - If there's one I
>> already know I might save some time implementing the server. :-)
>>
>
> I've done websocket servers in Python, Node.js, and Pike, and possibly
> others but I can't recall at the moment. Might have done one in Ruby,
> but that would have just been part of playing around and comparing
> features ("how easy is it to do in Ruby").
>
> ChrisA
*Big list of http static server one-liners*
Each of these commands will run an ad hoc http static server
in your current (or specified) directory, available at
http://localhost:8000. Use this power wisely.
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Re: Checking if email is valid
On 2023-11-01, Mats Wichmann wrote: > On 11/1/23 05:35, Simon Connah via Python-list wrote: >> OK. I've been doing some reading and that you should avoid regex to check >> email addresses. So what I was thinking was something like this: > > To be a little more specific, Avoid Rolling Your Own RegEx. It's very > tricky, and you will get it subtly wrong. Use e.g.: https://gitea.ksol.io/karolyi/py3-validate-email -- https://mail.python.org/mailman/listinfo/python-list
