I mad a call last night and never even talked to anybody, I knew I was being
charged to just look and I'm ok with that amount u was charged. There was
another charge though of I think 26 dollers witch I was not told or warned
about at all, I need to know who I can call and talk to about this
S
Anybody have any experience with creating a basic POS register system
in Python? Any existing projects out there you are aware of? This
would be a GUI app, standalone with some basic export and print
functions. I see this as a great opportunity to deepen my Python
experience but dont want to rei
fits inside the first 127 code points!!
As a bonus it also takes less brain power^H^H^H^H^H^H^H^H^H space. ;)
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folks reading your blog would just be
downloading, not logging and directly manipulating the repository.
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were passed, no implicit first argument. It is basically
useless in Python -- you can just use a
module function instead of a staticmethod.
For there record, staticmethod is useful when you want to make it possible for
subclasses to change behavior.
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ferently, or not at all, on other systems this is the
wrong way to fix it.
Where did you learn Python from? “Python Worst Practice for Dummies”?
Chris Warrick,
Was that necessary? Useful? Helpful in any way? If you can't be civil, keep
your posts to yourself.
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g away any time soon.
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nc(foo bar baz = 3)`, it still worked
when going through a dict.
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zeros (maybe it should have been two),
then silently skipping the loop is the "far, far worse" scenario. With
the infinite loop you at least know something went wrong, and you know
it pretty darn quick (since you are testing, right? ;).
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On 05/30/2013 08:56 AM, Chris Angelico wrote:
On Fri, May 31, 2013 at 1:02 AM, Ethan Furman wrote:
On 05/30/2013 05:58 AM, Chris Angelico wrote:
If you iterate from 1000 to 173, you get nowhere. This is the expected
behaviour; this is what a C-style for loop would be written as, it's
link!
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While I agree with Chris that 3.x is best, there is a free class from Udacity that is actually pretty good, even if it
does target Python2 (.7 I believe).
https://www.udacity.com/course/cs101
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[int(i) for i in ["1","2","3"]]
TypeError: str is not callable
Now how are you going to get the original int type back?
--> del int
Mark Janssen*, you would increase your credibility if you actually *learned*
Python.
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*full name used to disting
Python
Making Games with Python & Pygame
Both are for Python 3.x.
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On 06/13/2013 06:23 PM, Steven D'Aprano wrote:
I consider IDEs to be an attractive nuisance. It's like learning to be a
chef by putting food in a microwave and pushing the pre-set buttons.
+1 QOTW
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some other
method that doesn't exist on object, then this technique is necessary
to prevent the topmost class from trying to call that method on object
and erroring out.
But in that case the Blocker wouldn't call super since it is acting as the base
class.
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t's too late to change the name now, but pretending there is no good and valid
reason for confusion doesn't help.
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On 06/26/2013 04:54 PM, Steven D'Aprano wrote:
On Wed, 26 Jun 2013 13:14:44 -0700, Ethan Furman wrote:
On 06/23/2013 11:50 AM, Steven D'Aprano wrote:
What else would you call a function that does lookups on the current
object's superclasses?
Well, I would call it super
hat its current sys.exit behavior become default but optional in 3.4+.
There might even be an issue already if
one searched.
If the OP is writing an interactive shell, shouldn't `cmd` be used instead of `argparse`? argparse is, after all,
intended for argument parsing of command line scripts,
before,
IntEnum should work.
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:
Traceback (most recent call last):
File "ct.py", line 7, in
class MyEnum(ctypes.c_int, Enum):
File "/home/ethan/source/enum/enum/py2_enum.py", line 149, in __new__
enum_class = super(EnumMeta, metacls).__new__(metacls, cls, bases,
classdict)
Type
to make command-line scripts easier
and friendlier should quit with a traceback?
Really?
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On 06/28/2013 10:28 PM, Steven D'Aprano wrote:
I'm willing to concede that, just maybe, something like argparse could
default to "catch exceptions and exit" ON rather than OFF.
On this we can agree. :)
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uot;blah")
with tran2.subtransaction() as tran3:
tran3.query("blah")
# roll this subtransaction back
tran2.query("blah")
tran2.commit()
tran1.query("blah")
tran1.commit()
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quot;blah")
with tran.subtransaction():
tran.query("blah")
# roll this subtransaction back
tran.query("blah")
tran.commit()
tran.query("blah")
tran.commit()
This would definitely make more sense in a loop. ;)
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"""
a_wonderful_set_of_things = {
...,
not_missing_an_end_brace}
"""
You can also (be a fool and) put it at the same *indentation*:
"""
a_wonderful_set_of_things = {
...,
not_missing_an_end_brace
}
"""
Not only a fool but a crazy fool! That next-to-last line should have a comma!
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ing: self.transaction_active =', self.transaction_active
return self
with Tester() as conn:
print 'in first with block'
print '-' * 50
with Tester().updating() as conn:
print 'in second with block'
with it's
hobby =
"fishing"??
Yup, you sure can.
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On 07/09/2013 09:44 AM, Ian Kelly wrote:
On Tue, Jul 9, 2013 at 10:07 AM, Ethan Furman wrote:
You could also do it like this:
def updating(self):
self.transaction_active = True
return self
Yes, that would be simpler. I was all set to point out why this
doesn't
On 07/09/2013 11:41 AM, Ian Kelly wrote:
On Tue, Jul 9, 2013 at 11:23 AM, Ethan Furman wrote:
On 07/09/2013 09:44 AM, Ian Kelly wrote:
On Tue, Jul 9, 2013 at 10:07 AM, Ethan Furman wrote:
You could also do it like this:
def updating(self):
self.transaction_active = True
Expr(self, choice('+-*/'), choice('12345'))
`self` is just a name. In `expand()` you are rebinding the name `self` away from the object and to a new Expr instance.
If you want to change `self` the original object you have to do something like:
def expand(self):
On 07/09/2013 10:54 PM, Frank Millman wrote:
"Ian Kelly" wrote in message
news:calwzidnf3obe0enf3xthlj5a40k8hxvthveipecq8+34zxy...@mail.gmail.com...
On Tue, Jul 9, 2013 at 10:07 AM, Ethan Furman wrote:
You could also do it like this:
def upd
like this but do you realise that this is exactly what
you're arguing for when saying that sum() shouldn't use "+="?
my_obj = SomeKoolClass()
my_obj.modify_in_some_kool_way()
new_result = sum([SKC1, SKC2, SKC3], my_obj)
Guess what? You've just changed my_obj.
--
~Ethan~
--
h
I understand that the appropriate incantation in Python 3 is:
--> for k in list(d)
......
or
--> dk = list(d)
--> dk.remove(2)
which also has the added benefit of working the same way in Python 2.
So, my question boils down to: in Python 3 how is dict.keys() different from
dict? What are the use cases?
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On 07/24/2013 05:51 AM, Oscar Benjamin wrote:
On Jul 24, 2013 7:25 AM, "Peter Otten" <__pete...@web.de
<mailto:pete...@web.de>> wrote:
Ethan Furman wrote:
> So, my question boils down to: in Python 3 how is dict.keys() different
> from dict? What are the use ca
On 07/24/2013 10:23 AM, Stefan Behnel wrote:
Peter Otten, 24.07.2013 08:23:
Ethan Furman wrote:
So, my question boils down to: in Python 3 how is dict.keys() different
from dict? What are the use cases?
To me it looks like views are a solution waiting for a problem.
They reduce the API
h better and much more cleanly than the old
copy-to-list way.
Thank you. :)
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> dv = d.viewkeys()
--> list(dv)
[1, 2, 3]
--> list(dv)
[1, 2, 3]
And views are not sets -- they just support a couple set-like operations.
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On 07/23/2013 07:11 PM, Steven D'Aprano wrote:
On Tue, 23 Jul 2013 18:16:08 -0700, Ethan Furman wrote:
So now, in Python 3, .keys(), .values(), even .items() all return these
'view' thingies.
And everything I thought I knew about when to use one or the other went
out the windo
On 07/24/2013 11:01 PM, alex23 wrote:
On 25/07/2013 4:31 AM, Ethan Furman wrote:
2) Hopefully learn something about when a view is useful.
I haven't seeen this mentioned - forgive me if it's a repeat - but views are
constant references to whichever set they
represent.
Python
On 07/24/2013 10:48 PM, Steven D'Aprano wrote:
On Wed, 24 Jul 2013 08:57:11 -0700, Ethan Furman wrote:
My point is that in 2.x .keys() did something different from the dict,
while in 3.x it appears to me that they are the same.
Then you aren't looking very closely.
Actually, I a
concrete lists: they show the /current/ state, and
so are always up-do-date.
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On 07/28/2013 10:57 AM, Chris Angelico wrote:
.
.
.
Okay, how did you get confused that this was a Python List question? ;)
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login method you should add another that
doesn't depend on MyOpenID.
--
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On 07/29/2013 02:11 AM, Antoine Pitrou wrote:
Le Mon, 29 Jul 2013 00:55:53 -0700,
Ethan Furman a écrit :
Excerpt from http://meta.stackoverflow.com/q/190442/176681:
Janrain no longer actively supports MyOpenID, and announced on
Twitter that their users should proceed with caution.
This
t;
only gives errors.
x = (int('101', 2) & int('010', 2))
Notice the quotes.
In the future you'll better answers quicker if you tell us what you did (such
as your example above) as well as the errors.
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has the __ordered__ attribute removed
(presumably because, in contrast to Python 2.x, Python 3 will respect the order
of attribute definition).
Correct. In 3.4 __ordered__ never came into being as it was not necessary. I added that purely so that 2.x could be
ordered if desired.
--
~
On 07/30/2013 11:38 AM, Ethan Furman wrote:
Thanks for catching that, I'll get it fixed asap.
Latest code is on PyPI.
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to be `_value_`, but in the other methods `.value` works
fine. Updated the 3.4 example with `.value`.
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you, along with the full trace-back, giving you most if not all
the information you needed to track down the bug.
~Ethan~
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Ben Finney wrote:
Chris Angelico writes:
梦幻草 wrote:
why can't I send images to python-list@python.org??
>>
It's a text-only list.
I'll take this opportunity to give heartfelt thanks to the
administrators for that policy; please keep this a text-only forum.
+1000
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Ian Kelly wrote:
def del_b(self, b):
for i, x in enumerate(self.array):
if b is x:
del self.array[i]
break
Nice work, Ian.
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ecord?
~Ethan~
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MRAB wrote:
On 06/07/2012 22:34, Ethan Furman wrote:
I'm looking for some free advice. ;)
My dbf module has three basic containers, all of which support list-like
access: Table, List, and Index, each of which is filled with
_DbfRecords.
The fun part is that a _DbfRecord can compare
Devin Jeanpierre wrote:
On Fri, Jul 6, 2012 at 6:46 PM, Ethan Furman wrote:
It's checking for equality, not identity.
>>> x = float('nan')
>>> x in [x]
True
It's checking for equality OR identity.
Good point. In my case, checking for equality w
.6 (or at least
the end of the 2.x cycle) I would be suspicious that they actually had
the experience they claimed.
~Ethan~
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a few years ago where the prospective
employer wanted three plus years experience in some language, and that
language had only been created a year and a half before.
~Ethan~
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ion class offered in conjunction
with the Illinois Institute of Technology (or something like that) which
was created by Steve Holden, and taught by him and a couple others.
It's a great course of four classes.
~Ethan~
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ve a conflict between treating
time values as time values ("midnight is nothing special") and as numbers
("midnight == 0 which is falsey").
--> import datetime
--> mn = datetime.time(0)
--> mn
datetime.time(0, 0)
--> mn == 0
False
Apparently, midnight does
re what Steven was trying to say there, but for me:
jar with no jellybeans == 0
no jar == None
~Ethan~
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ned quacks like nothing, doesn't it?
It's about /representing/ something vs. nothing. An undefined name isn't
representing anything (except a bug, of course ;).
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to one declared type, where the type declaration mechanisms are usually
quite limited.
>>> def max(a, b):
if a <= b: return a
return b
Surely you meant 'if a >= b: . . .'
No worries, I'm sure your unittests would have caught it. ;)
~Ethan~
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Mark Lawrence wrote:
On 17/07/2012 18:29, Ethan Furman wrote:
Terry Reedy wrote:
On 7/17/2012 10:23 AM, Lipska the Kat wrote:
Well 'type-bondage' is a strange way of thinking about compile time
type
checking and making code easier to read (and therefor debug
'type-
eleted record
3) go to the seventh undeleted record (possibly the least practical)
4) raise an exception
Any opinions?
~Ethan~
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Ian Kelly wrote:
On Tue, Jul 17, 2012 at 4:57 PM, Ethan Furman wrote:
In Foxpro if you do a
GOTO 7
with deleted off and record 7 is deleted, the record pointer doesn't
move (at least in version 6).
I don't like that.
I see four other options:
0) don't move the poin
MRAB wrote:
On 17/07/2012 23:57, Ethan Furman wrote:
In Foxpro if you do a
GOTO 7
with deleted off and record 7 is deleted, the record pointer doesn't
move (at least in version 6).
I don't like that.
I see four other options:
0) don't move the pointer (listed for complet
MRAB wrote:
On 18/07/2012 03:19, Ethan Furman wrote:
MRAB wrote:
On 17/07/2012 23:57, Ethan Furman wrote:
In Foxpro if you do a
GOTO 7
with deleted off and record 7 is deleted, the record pointer doesn't
move (at least in version 6).
I don't like that.
I see four other options:
nctions exist -- kinda ;) Even functions live in some
namespace: len() lives in __builtin__, any top level function lives in
its module, etc. Oh, and namespaces are objects.
It seems to me that Python is more about providing tools, and then
staying out of your way.
That works for me. Maybe
Ed Leafe wrote:
On Jul 17, 2012, at 5:57 PM, Ethan Furman wrote:
In Foxpro if you do a
GOTO 7
with deleted off and record 7 is deleted, the record pointer doesn't
move (at least in version 6).
I don't like that.
I see four other options:
0) don't move the pointer (listed f
Getting closer to a stable release.
Latest version has a simpler, cleaner API, and works on PyPy (and
hopefully the other implementations as well ;), as well as CPython.
Get your copy at http://python.org/pypi/dbf.
Bug reports, comments, and kudos welcome! ;)
~Ethan~
--
http
Steven D'Aprano wrote:
On Fri, 20 Jul 2012 16:59:21 -0700, Ethan Furman wrote:
Getting closer to a stable release.
Excellent! That's fantastic news! I've been waiting for a stable release
of dbf for months! I just have one question.
What is dbf?
:)
dbf (also known as pyt
nightmare;
My support is pretty good. :)
3) that he just doesn't give a monkey's toss for anyone else's time
See point one.
or all three. Ethan is a good, helpful member of this community, and
so I'm pretty sure that neither 2) nor 3) are true, but others may get
the
h PyPy 1.8. (Tested)
Should work with the others. (Not tested)
~Ethan~
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Chris Angelico wrote:
On Sat, Jul 21, 2012 at 6:02 PM, Ethan Furman wrote:
Works with CPython 2.4 - 2.7. (Tested)
Have you considered supporting 3.2/3.3 at all? It's often not
difficult to make your code compatible with both. Or is there some
dependency that is locked to 2.X?
I'
S : bareable is spelt bearable.
I wondered about that. :/
~Ethan~
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Ethan Furman wrote:
Alex Strickland wrote:
"Not supported: index files":
I have been using http://sourceforge.net/projects/harbour-project/ for
years where a guy called Przemyslaw Czerpak has written an absolutely
bullet proof implementation of NTX and CDX for DBF. Maybe it will
Chris Angelico wrote:
On Sun, Jul 22, 2012 at 4:15 AM, Ethan Furman wrote:
I'll support 3.3+, but not with the same code base: I want to use all the
cool features that 3.3 has! :)
The trouble with double-codebasing is that you have double
maintenance. But sure. So long as your time
some valuable time.
~Ethan~
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American invention, so no claiming it as an
Australian thing. We just need to get a few more people here to start
observing it; that's all.
I'm in! At least for next year. Assuming I remember...
~Ethan~
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:
do_something()
except:
pass()
Do you have a use case where `pass()` works but `pass` doesn't?
~Ethan~
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thing to do.
What code does `pass` run? When do we pass parameters to `pass`? When
do we need to override `pass`?
Answers: None. Never. Still waiting for a reply from the OP for a use
case.
How does that quote go? "A foolish consistency is the hobgoblin of
little minds"? Thi
A few more bug fixes, and I actually included the documentation this
time. :) It can be found at http://python.org/pypi/dbf, and has been
tested on CPythons 2.4 - 2.7, and PyPy 1.8.
dbf v0.94.003
=
dbf (also known as python dbase) is a module for reading/writing
dBase III, FP,
that .keys(), .values(), etc., will
maintain order unless the dict is modified in between calls.
~Ethan~
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nless you modify the dict while iterating).
or modify the dict between iterations.
~Ethan~
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John Ladasky wrote:
On Wednesday, July 25, 2012 9:32:33 PM UTC-7, Ethan Furman wrote:
What code does `pass` run? When do we pass parameters to `pass`? When
do we need to override `pass`?
Answers: None. Never. Still waiting for a reply from the OP for a use
case.
When I brought up
ary, but I wouldn't call it `_pass`.
~Ethan~
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Simon Cropper wrote:
On 27/07/12 05:31, Ethan Furman wrote:
A few more bug fixes, and I actually included the documentation this
time. :) It can be found at http://python.org/pypi/dbf, and has been
tested on CPythons 2.4 - 2.7, and PyPy 1.8.
[snip]
Ethan,
That's great.
Can you comme
fficult to read.
~Ethan~
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Pedro Kroger wrote:
On Jul 30, 2012, at 3:33 PM, Ethan Furman <mailto:et...@stoneleaf.us>> wrote:
Pedro Kroger wrote:
Pyknon is a simple music library for Python hackers.
Sounds cool. How is 'Pyknon' pronounced?
I pronounce it similarly as google translate do
Terry Reedy wrote:
On 7/31/2012 4:49 PM, Chris Kaynor wrote:
On Tue, Jul 31, 2012 at 1:21 PM, Terry Reedy wrote:
Another example: KeyError and IndexError are both subscript errors,
but there is no SubscriptError superclass, even though both work
thru the same mechanism -- __getitem__. The reas
pe of situation with indices, but now I'm
wondering if the :name: method is not pythonic and I should use a flag
(in_memory=True) when memory storage instead of disk storage is desired.
Thoughts?
~Ethan~
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Peter Otten wrote:
Ethan Furman wrote:
SQLite has a neat feature where if you give it a the file-name of
':memory:' the resulting table is in memory and not on disk. I thought
it was a cool feature, but expanded it slightly: any name surrounded by
colons results in an in-memory t
Mark Lawrence wrote:
On 21/07/2012 00:59, Ethan Furman wrote:
Getting closer to a stable release.
Latest version has a simpler, cleaner API, and works on PyPy (and
hopefully the other implementations as well ;), as well as CPython.
Get your copy at http://python.org/pypi/dbf.
Bug reports
e is:",num3
print "New Number Two is:",num4
This works.
No, it doesn't. If it does work for you then you have code you aren't
showing us.
~Ethan~
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Ole Martin Bjørndalen wrote:
On Thu, Aug 2, 2012 at 5:55 PM, Ethan Furman wrote:
SQLite has a neat feature where if you give it a the file-name of ':memory:'
the resulting table is in memory and not on disk. I thought it was a cool
feature, but expanded it slightly: any name sur
Mark Lawrence wrote:
With arrogance like that German by any chance?
Comments like that are not appropriate on this list. Please don't make
them.
~Ethan~
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[redirecting back to list]
Ole Martin Bjørndalen wrote:
On Sun, Aug 5, 2012 at 4:09 PM, Ethan Furman wrote:
Ole Martin Bjørndalen wrote:
You can do this by implementing either __getitem__ or __iter__, unless the
streaming flag would also make your table not in memory.
Cool!
Wow! I realize
ese are not the errors an intermediate user would make, nor the
questions an intermediate user would ask. These are the errors that
somebody who doesn't know Python would make.
Please do not misrepresent yourself.
~Ethan~
P.S. The scale I am accustomed to is Novice -> Intermediate
- is there a neat python-like way to this? I
realize I can do things like use a variable for k in range(1): and
then derive values for i and j from k, but I'm wondering if there's
something less clunky.
for i in range(N, N+100):
for j in range(M, M+100):
do_something
Ed Leafe wrote:
When converting from paradigms in other languages, I've often been
tempted to follow the accepted pattern for that language, and I've almost
always regretted it.
+1
When in doubt, make it as Pythonic as possible.
+1 QOTW
~Ethan~
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