Re: How to install Python package from source on Windows
Deborah Swanson wrote: I got one suggestion that I could just copy the files to "the appropriate directories", That was me, but I've just had a look at the source, and it seems the core functionality is implemented in C, so scrub that idea. But all is not lost. I've found this: https://pypi.python.org/pypi/namedlist "Similar to namedtuple, but instances are mutable." It's all pure Python -- I checked this time! -- so you shouldn't have any trouble installing it. In fact it's just a single source file, namedlist.py. Put that in your site-packages folder and you should be good to go. -- Greg -- https://mail.python.org/mailman/listinfo/python-list
Re: How to install Python package from source on Windows
Deborah Swanson wrote: Why do you care so deeply what pip does on an operating system that is no longer supported? Being pipless is a sufficiently distressing fate that we'd like to help, even if you didn't explicitly request it. Particularly since it seems like such an unnecessary one, because installing pip shouldn't require any kind of compiler on any version of any operating system, supported or otherwise. So the fact that it apparently does on your system is very puzzling, and some of us would like to solve that puzzle. -- Greg -- https://mail.python.org/mailman/listinfo/python-list
Re: How to install Python package from source on Windows
Deborah Swanson wrote: I have already offered to do whatever you would like me to do on this system If you wouldn't mind, I'd like to see the output from this command: python -m ensurepip -- Greg -- https://mail.python.org/mailman/listinfo/python-list
Re: Working with dictionaries and keys help please!
On Thu, 1 Jun 2017 10:29 am, David D wrote:
> I have a dictionary with a 10 people, the key being a number (0-10) and the
> value being the people's name. I am in the processing of Insert, Adding and
> deleting from the dictionary. All seems well until I delete a person and add
> a new one. The numbers (keys) do not change and so I am getting an
> non-sequential set of numbers for the keys. Is there a way of performing this
> where the key will update so that is continues to work sequentially? Here is
> what I mean
>
> Print dictionary
> {0 John, 1 David, 2 Phil, 3 Bob}
>
> remove 1 David
> {0 John, 2 Phil, 3 Bob}
>
> How can I get it so that the VALUE will reset and it will look like this after
> both adding or deleting?
>
> {0 John, 1 Phil, 2 Bob}
You can't. That's not how dicts work.
The dictionary key is similar to the primary key in a database. The fact that
they start off as sequential values is irrelevant. Imagine that you create an
account for Phil, and he gets account number 2; then Bob gets account number 3:
print(accounts)
=> {0: John, 1: David, 2: Phil, 3: Bob}
Then you delete David's account. Then Phil calls you, tells you his account
number is 2, and you access Bob's records instead of Phil's!
Database keys should never be changed or reused.
--
Steve
“Cheer up,” they said, “things could be worse.” So I cheered up, and sure
enough, things got worse.
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Re: Circular iteration on tuple starting from a specific index
guillaume.pau...@giome.fr wrote: def cycle_once(iterable, start): return chain(islice(iterable, start, None), islice(iterable, start)) Another variation, maybe slightly more efficient: from itertools import islice, cycle def cycle_once(iterable, start): return islice(cycle(iterable), start, start + len(iterable)) -- Greg -- https://mail.python.org/mailman/listinfo/python-list
Re: Python DB API - commit() v. execute("commit transaction")?
Chris Angelico wrote: In the DB API 3.0, what I would like to see is that the connection becomes a context manager that gives you a transaction object. With that transaction, you can perform queries, and you could create cursors from it if you want them, or just use a single in-built cursor. But a cursor would relate to a result set, and would have no meaning outside of it. A while back I wrote a dedicated wrapper around the Firebird API (I wasn't impressed by the DB API, for many of the reasons being discussed here), and this is almost exactly how I structured it. Except I didn't really have cursors as an explicit concept at all -- executing a query just gave you an object that you iterate over to get the results. It just seemed the most Pythonic way to do it. It helped that the Firebird API itself was structured that way, so all I really had to do is wrap it in the most straightforward way. Is there any serious work being done on a DB API 3.0? If there is, I'd be interested in helping with the design. -- Greg -- https://mail.python.org/mailman/listinfo/python-list
Re: Python DB API - commit() v. execute("commit transaction")?
On 2017-06-01, Gregory Ewing wrote: > Is there any serious work being done on a DB API 3.0? > If there is, I'd be interested in helping with the design. There are a bunch of existing APIs in other languages that can easily be copied ;-) The good news is of course that since the DB-API 'Connection' class has so few existing methods, adding new ones while maintaining backwards-compatibility should be easy. -- https://mail.python.org/mailman/listinfo/python-list
Re: Python DB API - commit() v. execute("commit transaction")?
On Thu, Jun 1, 2017 at 8:05 PM, Gregory Ewing wrote: > A while back I wrote a dedicated wrapper around the Firebird > API (I wasn't impressed by the DB API, for many of the reasons > being discussed here), and this is almost exactly how I structured > it. Except I didn't really have cursors as an explicit concept at > all -- executing a query just gave you an object that you iterate > over to get the results. It just seemed the most Pythonic way to > do it. Executing a query gives you some sort of object. That object either contains all the results, or has the resource handle (or whatever) needed to fetch more from the back end. That basically makes it a cursor, so we're not far different after all :) ChrisA -- https://mail.python.org/mailman/listinfo/python-list
RE: How to install Python package from source on Windows
Gregory Ewing wrote, on Thursday, June 01, 2017 12:59 AM > > Deborah Swanson wrote: > > I got one suggestion that I could just copy the files to "the > > appropriate directories", > > That was me, but I've just had a look at the source, and it > seems the core functionality is implemented in C, so scrub that idea. Yes, memoryslots.c is core functionality, and I was just going to have to fake it if the compiled file needed more than just being dropped into Site Packages. > But all is not lost. I've found this: > https://pypi.python.org/pypi/namedlist "Similar to namedtuple, but instances are mutable." It's all pure Python -- I checked this time! -- so you shouldn't have any trouble installing it. In fact it's just a single source file, namedlist.py. Put that in your site-packages folder and you should be good to go. -- Greg Thanks Greg! I just ran into another wall, unsolvable by any methods I've come up with yet, so I'm trying to unroll the namedtuples into a list of lists, and that turns out to be trickier than you'd think too. I'll give namedlist a try, seems the PyPi people have seen that hole in namedtuples' functionality and have worked on some alternatives. Spectacular! Deborah -- https://mail.python.org/mailman/listinfo/python-list
RE: How to install Python package from source on Windows
Gregory Ewing wrote, on Thursday, June 01, 2017 1:12 AM > > Deborah Swanson wrote: > > Why do you care so deeply what pip does on an operating > system that is > > no longer supported? > > Being pipless is a sufficiently distressing fate that we'd > like to help, even if you didn't explicitly request it. > > Particularly since it seems like such an unnecessary one, > because installing pip shouldn't require any kind of compiler > on any version of any operating system, supported or > otherwise. So the fact that it apparently does on your system > is very puzzling, and some of us would like to solve that puzzle. > > -- > Greg That's nice, but as I've said, the problem can be solved by reinstalling Anaconda3 and PyCharm. Not fun or easy, but at least the outcome would be known if I really needed pip, which I won't for quite awhile. Honestly, this installation of Anaconda3 is so unstable it behaves differently everytime I try to do something with it. Better to leave well enough alone right now. I really need what little usable time I have making progress with Python, and I should be a lot healthier in a few months. And I'd rather spend the downtime then getting my good computer up and running, and Python on Linux again. Then this problem vanishes. Deborah -- https://mail.python.org/mailman/listinfo/python-list
RE: How to install Python package from source on Windows
Gregory Ewing wrote, on Thursday, June 01, 2017 1:15 AM > > Deborah Swanson wrote: > > I have already offered to do whatever you would like me to > do on this > > system > > If you wouldn't mind, I'd like to see the output from this command: > > python -m ensurepip > > -- > Greg The rest of that sentence was something like later, when I have Python in Linux and don't need this sytem anymore. I've tried ensurepip 2 or 3 times, with different unsuccessful outcomes each time. I really am done trying to fix this installation, and I just hope it holds together for PyCharm's use as long as I need it to. Couple months, I think. And if I don't touch it, should be ok. Now please, can we be done with this for now? Deborah -- https://mail.python.org/mailman/listinfo/python-list
Re: Circular iteration on tuple starting from a specific index
On Thu, Jun 1, 2017 at 4:14 AM, Gregory Ewing wrote: > guillaume.pau...@giome.fr wrote: >> >> def cycle_once(iterable, start): >> return chain(islice(iterable, start, None), islice(iterable, start)) This assumes that iterable is restartable, which is not the case if iterable is itself an iterator. > Another variation, maybe slightly more efficient: > > from itertools import islice, cycle > > def cycle_once(iterable, start): > return islice(cycle(iterable), start, start + len(iterable)) Similar problem here, len will fail on an iterator. I know the OP specified a tuple (and that was what my own solution assumed), but "iterable" implies broader applicability. -- https://mail.python.org/mailman/listinfo/python-list
Converting epoch to string in format yyyy-mm-dd, or maybe it is not necessary
I have a dataframe with epoh dates, something like this:
df = pd.DataFrame( { 'epoch' : [1493928008, 1493928067, 1493928127, 1493928310,
1493928428, 1493928547]})
I want to create a new column with epoch converted to -mm-dd as string.
Actually, I have a epoch column, and I would like to use it for grouping data
by day, let's say min, max... mayge there is no need for conversion at all.
How to do that?
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[OT] How to improve my programming skills?
Hello everybody! TLDR: Sorry for OT. Long-time Linux geek and hobby programmer wants to improve his coding skills. What's most important: project planing, algorithms and data structures, contributing to FOSS, web development, learning other languages or something else? Sorry for posting such a (long) off-topic question, which even is partly even more about psychology, than about technology. But I'm mostly using Python and Bash for programming and am reading this mailing list/newsgroup for many years now, and hope it's Ok (feel free to direct me somewhere more appropriate, as long it's an equally helpful and friendly place). I'm looking for a way (*the* way, ie. the "BEST(tm)" way) to improve my coding skills. While I'm a quite hard-core computer geek since 25 years and a really good (hobbyist) Linux-SOHO-Admin, my programming skills are less than sub-par. I wish to change that and become at least am average hobby-programmer. I'm an excellent autodidact and in fact, all what I know about computers is completely self-taught. Now, the problem is, that I'm 41 years old now, have a day job (which hasn't much to do with advanced computing stuff), friends and all that. There is little time left for this undertaking (something like 5 - 10 hours per week), so I'm looking for the most efficient ways to do this. I identify the following problems which could be worth improving: - I never sit down and plan anything with pencil and paper, flowcharts, UML or anything else. I just fire up Vim and start typing. That works (albeit slowly) for simple programs, but as soon as the project becomes a little more complex the parts and components don't match well and I need to botch something together to somehow make it work. And in the resulting mess I lose the interest. - I never learned algorithms and data structures. I know *what* (linked) lists, dicts, arrays, structs, and trees are; what binary search or bubble-sort is, but I never really studied them, let alone implemented them for educative purposes. - When it comes to coding, I'm heavily shy and unsure. I really know my stuff when it's about Linux-SOHO-Administration, but when trying to contribute to FOSS projects I always hesitate for several reasons (somehow I never find those low-hanging fruits that everybody talks about; either it's super-easy or to difficult.) - For my day job (which is absolutely not my dream job) it would be quite useful to know web design/development, especially WordPress stuff. But web programming always feel like being trapped in a mangrove jungle, with all those browser-specialties, different and incompatible JS-engines, PHP versions and all that. I'm almost never in the mood to learn web development. - Beside Python and Bash -- which I both know rather well (for a hobbyist at least) -- I only know a little C, some LUA and a tiny bit of Scheme. - I'm very hard to motivate, when the issue or topic doesn't interest me much. I know some tricks to increase my motivation in such cases, but don't use them enough. What do you think, which of the problems would be most important to overcome? What would be the most efficient way for improving my general programming skills? Do you have any other suggestions or tips? Much thanks for your time! Mirko -- https://mail.python.org/mailman/listinfo/python-list
Test to see if message is bounced
Apologies if this appears on the list, but I'm checking whether I have been placed onto a blacklist since previous postings have been bounced back with an error that the email address is not on the "subscribers list". I previously had an email address of "dickie.mose...@virgin.net" which has now been deactivated. Richard Moseley -- https://mail.python.org/mailman/listinfo/python-list
Re: Test to see if message is bounced
On Fri, Jun 2, 2017 at 3:44 AM, Richard Moseley wrote: > Apologies if this appears on the list, but I'm checking whether I have been > placed onto a blacklist since previous postings have been bounced back with > an error that the email address is not on the "subscribers list". I > previously had an email address of "dickie.mose...@virgin.net" which has > now been deactivated. Looks fine to me. Most likely, your *email address*, not you as a person, would have been blocked for excessive bounces. It's nothing against you as a person. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: [OT] How to improve my programming skills?
On 2017-06-01 16:26, Mirko via Python-list wrote: [snip] I'm looking for a way (*the* way, ie. the "BEST(tm)" way) to improve my coding skills. While I'm a quite hard-core computer geek since 25 years and a really good (hobbyist) Linux-SOHO-Admin, my programming skills are less than sub-par. I wish to change that and become at least am average hobby-programmer. I'm an excellent autodidact and in fact, all what I know about computers is completely self-taught. Now, the problem is, that I'm 41 years old now, have a day job (which hasn't much to do with advanced computing stuff), friends and all that. There is little time left for this undertaking (something like 5 - 10 hours per week), so I'm looking for the most efficient ways to do this. The best way is practice, which takes time. I don't know of a shortcut. I identify the following problems which could be worth improving: - I never sit down and plan anything with pencil and paper, flowcharts, UML or anything else. I just fire up Vim and start typing. That works (albeit slowly) for simple programs, but as soon as the project becomes a little more complex the parts and components don't match well and I need to botch something together to somehow make it work. And in the resulting mess I lose the interest. Flowcharts? UML? Never used them! :-) I _have_ used sometimes pseudocode, though. Python has been described as "executable pseudocode" in the past, which is probably why I like it so much. - I never learned algorithms and data structures. I know *what* (linked) lists, dicts, arrays, structs, and trees are; what binary search or bubble-sort is, but I never really studied them, let alone implemented them for educative purposes. Higher-level languages like Python have dicts and sorting built-in, so unless you're working on improving the low-level implementation, you don't need to know the details. [snip] - I'm very hard to motivate, when the issue or topic doesn't interest me much. I know some tricks to increase my motivation in such cases, but don't use them enough. You could pick something that you could automate. That way, you'd be learning and also saving time in the long run. What do you think, which of the problems would be most important to overcome? What would be the most efficient way for improving my general programming skills? Do you have any other suggestions or tips? If you don't enjoy programming, it's probably not for you! :-) -- https://mail.python.org/mailman/listinfo/python-list
Re: [OT] How to improve my programming skills?
On 2017-06-01, Mirko via Python-list wrote: > Hello everybody! > > TLDR: Sorry for OT. Long-time Linux geek and hobby programmer > wants to improve his coding skills. What's most important: > project planing, algorithms and data structures, contributing > to FOSS, web development, learning other languages or something > else? I recommend a few things you haven't yet mentioned: learning to use source control, and working toward a systematic way of composing and runnings tests as you develop.. Secondly, I recommend picking up a programming langauge that concentrates on functional programming with immutable state if you haven't done it before. The book that worked for me was Simply Scheme https://people.eecs.berkeley.edu/~bh/ss-toc2.html, but that's sorta ancient history now and I'm sure there's lots more options out there. -- Neil Cerutti -- https://mail.python.org/mailman/listinfo/python-list
Celery + Django logging and RotateFileHandler
I have a Django project setup with Celery and a RotatingFileHandler setting
like shown below:
LOGGING = {
'version': 1,
'handlers': {
'console':{
'class':'logging.StreamHandler',
'stream': sys.stdout,
},
'celery': {
'class': 'logging.handlers.RotatingFileHandler',
'filename': '/var/log/celery/celery.log',
'formatter': 'verbose',
'maxBytes': (1024 * 1024 * 10), # 10 mb
'backupCount': 10
},
},
'formatters': {
'verbose': {
'format': '%(levelname)s %(asctime)s %(module)s %(process)d
%(thread)d %(message)s'
},
},
'loggers': {
'sm9.views': {
'handlers':['console'],
'propagate': True,
'level': os.getenv('DJANGO_LOG_LEVEL', 'INFO'),
},
'sm9.helpers': {
'handlers':['console'],
'propagate': True,
'level': os.getenv('DJANGO_LOG_LEVEL', 'INFO'),
},
'sm9.soap': {
'handlers':['celery'],
'propagate': True,
'level': os.getenv('DJANGO_LOG_LEVEL', 'INFO'),
},
'sm9.tasks': {
'handlers':['celery'],
'propagate': True,
'level': os.getenv('CELERYD_LOG_LEVEL', 'INFO'),
},
'celery': {
'handlers': ['celery'],
'level': os.getenv('CELERYD_LOG_LEVEL', 'INFO'),
'propagate': True
},
},
}
When celery.log reaches 10mb the system is creating 2 more files: celery.log.1,
celery.log.2 . All files are beeing populated simultaneously instead of
reaching 10mb and opening a new file. Is this the expected behavior?
Celery is running as a daemon with 3 threads.
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Re: [OT] How to improve my programming skills?
On Fri, 2 Jun 2017 01:26 am, Mirko wrote: > TLDR: Sorry for OT. Long-time Linux geek and hobby programmer wants > to improve his coding skills. What's most important: project > planing, algorithms and data structures, contributing to FOSS, web > development, learning other languages or something else? Programming. If you want to improve your programming skills, you must *write code* and then *run that code* and if it breaks you must *fix that code*. I cannot tell you how many hours I have wasted writing code that I've never actually run. Its a trap. -- Steve “Cheer up,” they said, “things could be worse.” So I cheered up, and sure enough, things got worse. -- https://mail.python.org/mailman/listinfo/python-list
Re: Converting epoch to string in format yyyy-mm-dd, or maybe it is not necessary
zljubi...@gmail.com writes:
> I have a dataframe with epoh dates, something like this:
>
> df = pd.DataFrame( { 'epoch' : [1493928008, 1493928067, 1493928127,
> 1493928310, 1493928428, 1493928547]})
>
> I want to create a new column with epoch converted to -mm-dd as string.
"epoch" dates usually mean seconds since 1.1.1970, represented
as an integer or float. A single epoch date is usually not represented
as a list (as above).
For details, read the head of the "time" module documentation.
The "time" module contains 2 functions to convert from an
"epoch date" to a time tuple: "gmtime"
(this gives an UTC or Greenwich Mean time tuple) and "localtime" (this
gives a time tuple represented in the local time zone).
You can use "time.strftime" to get a string representation (according
to a format you specify) from a time tuple.
Again, the documentation of the "time" module tells the details.
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