::
str(pizza_night)
'fri'
shirt_colour.index
2
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`\ trouble. It's the things we know that ain't so. -- Artemus |
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Support the Python Software Foundation:
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).
* A document answering Frequently Asked Questions is now added.
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Ben Finney
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Ben Finney [EMAIL PROTECTED] wrote:
If I want to implement a __repr__ that's reasonably nice to the
programmer, what's the Right Way? Are there recipes I should look
at?
As a (carefully selected) example from the code I'm writing:
import lib.attribute
m = lib.attribute.Human_Sex
Marc 'BlackJack' Rintsch [EMAIL PROTECTED] wrote:
In [EMAIL PROTECTED], Ben Finney wrote:
class Human_Sex(str):
def __repr__(self):
repr_str = %s(name=%s) % (
self.__class__.__name__,
str.__repr__(self
Erik Max Francis [EMAIL PROTECTED] wrote:
Ben Finney wrote:
If I want to implement a __repr__ that's reasonably nice to the
programmer, what's the Right Way? Are there recipes I should look
at?
I tend to use:
def __repr__(self):
if hasattr(self, '__str__
exhilarating as to be shot at without |
`\result. -- Winston Churchill |
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record to learn Spanish. I turned it |
`\on and went to sleep; the record got stuck. The next day I |
_o__)could only stutter in Spanish. -- Steven Wright |
Ben Finney
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)Gordon Noel Byron |
Ben Finney
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) |
Ben Finney
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) |
Ben Finney
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those bumper stickers. He hates |
`\ New York. -- Steven Wright |
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Philips |
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Roy Smith [EMAIL PROTECTED] wrote:
Ben Finney [EMAIL PROTECTED] wrote:
Test cases should each run individually, from a known state, and
not depend on any other tests. You can define a fixture for
several tests in the unittest.TestCase methods setUp() and
tearDown(), to establish and clear
.
The definition is agreeably solid.
The intention is disagreeably sickening.
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`\ |
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Ben Finney
in the way.
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`\ in time. -- Steven Wright |
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Steven D'Aprano [EMAIL PROTECTED] wrote:
On Mon, 14 Nov 2005 00:48:46 +1100, Ben Finney wrote:
I believe Pierre is looking for a syntax that will save him from
assigning values to names; that Python will simply assign
arbitrary unique values for these special names.
What I still don't
Michael [EMAIL PROTECTED] wrote:
Ben Finney wrote:
I've yet to see a convincing argument against simply assigning
values to names, then using those names.
If you have a name, you can redefine a name, therefore the value a
name refers to is mutable.
Since there are mutable and immutable
Ben Finney [EMAIL PROTECTED] wrote:
I want my modules to (sometimes) define an abstract base exception
class, that all other exceptions in that module inherit from.
Not a whole lot of feedback on this, so here's the implementation I
decided upon.
class FooException(Exception
Ben Finney [EMAIL PROTECTED] wrote:
I want my modules to (sometimes) define an abstract base exception
class, that all other exceptions in that module inherit from.
[re-posting with the implementation properly foo-ified]
Not a whole lot of feedback on this, so here's the implementation I
two boys and a girl.' -- Steven Wright |
_o__) |
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at |
`\the rate of 40,000 or even 4,000 per hour ... -- F. H. Wales |
_o__) (1936) |
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Ben Finney
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of the
built-in iterable types?
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sys; help(sys.exit)' will be of assistance.
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`\ human. -- David Bowie |
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mine to theirs, hence the
question.
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`\ what to feed it. -- Steven Wright |
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of |
`\ sex. -- Gore Vidal |
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Fuzzyman [EMAIL PROTECTED] wrote:
Ben Finney wrote:
On dirtSimple.org[0], PJE wrote:
[...] Python code is easy to write, but hard to depend on. You
pretty much have to:
1. limit yourself to platforms with a suitable packaging
system,
2. bundle all
) |
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Diller |
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you looked at it in the right way, did not become still |
_o__) more complicated. -- Paul Anderson |
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The Eternal Squire [EMAIL PROTECTED] wrote:
Ben Finney wrote:
Ethics such as sharing, and helping one's neighbour?
Giving away an illegal copy of software it not helping one's
neighbor, it is making that neighbor an accessory to copyright
infringement, a federal offense punishable
Wright |
_o__) |
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is useful for debugging.
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_o__)contact. -- Jack Handey |
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to a costume party at your boss's house, wouldn't |
`\ you think a good costume would be to dress up like the boss's |
_o__) wife? Trust me, it's not. -- Jack Handey |
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Bengt Richter [EMAIL PROTECTED] wrote:
Ben Finney [EMAIL PROTECTED] wrote:
Getting a numeric index might be useful in a language such as
Pascal, with no built-in dict or sequence types. In Python, where
any immutable object can be a dict key, and any sequence can be
iterated, it seems
[EMAIL PROTECTED] wrote:
Ben Finney wrote:
How do we deal with the rampant proliferation of a zillion
implementations of some standard idiom in PyPI?
How about some kind of mega util package? One big package with all
those recurring reinventions. If it gets popular enough, I'm sure
of the |
`\ precipitate. -- Steven Wright |
_o__) |
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Bengt Richter [EMAIL PROTECTED] wrote:
On Sat, 19 Nov 2005 11:10:42 +1100 (EST), Ben Finney [EMAIL PROTECTED]
wrote:
Bengt Richter [EMAIL PROTECTED] wrote:
If [an enumeration has a fixed sequence], what is more natural
than using their index values as keys to other ordered info?
I don't
Steven D'Aprano [EMAIL PROTECTED] wrote:
On Fri, 18 Nov 2005 14:32:46 +1100, Ben Finney wrote:
Is there any difference between a Python immutable value, and a
constant? I suppose constant also implies that the *name* binds
unchangeably to a particular value. Is that meaningful?
That's
|
`\Wright |
_o__) |
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) |
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just an awful lot of |
_o__) 'us'. -- Douglas Adams |
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[restored my attribution line so we know who said what]
Christoph Zwerschke [EMAIL PROTECTED] wrote:
Ben Finney wrote:
In what cases do you find yourself needing a dict that preserves
its key order? Can you present a use case that would be improved
by an ordered dict?
There are too many
just as little |
`\ taste. -- Henry L. Mencken |
_o__) |
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to |
`\ recognize a mistake when you make it again. -- Franklin P. |
_o__)Jones |
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on my dog. Now he's gone. -- Steven |
`\Wright |
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Alex Martelli [EMAIL PROTECTED] wrote:
Ben Finney [EMAIL PROTECTED] wrote:
How can a (user-defined) class ensure that its instances are
immutable, like an int or a tuple, without inheriting from those
types?
You can make a good start by defining __setattr__, __delattr__ (and
__setitem__
Alex Martelli [EMAIL PROTECTED] wrote:
Ben Finney [EMAIL PROTECTED] wrote:
How can a (user-defined) class ensure that its instances are
immutable, like an int or a tuple, without inheriting from those
types?
[...]
Of course, these restrictions can be easily worked around
Alex Martelli [EMAIL PROTECTED] wrote:
Ben Finney [EMAIL PROTECTED] wrote:
Why is I want to make objects immutable seen as I don't trust
my users? Are Python's existing immutable types also seen the
same way? If not, why the distinction?
A type implemented in C offers different
bought some batteries, but they weren't included; so I had |
`\ to buy them again. -- Steven Wright |
_o__) |
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of the
freedom for anyone they choose to hack on it.
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`\ '1 mile equals 1 mile'... Last summer, I folded it. -- Steven |
_o__) Wright |
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, in |
_o__) a letter to Madison |
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you see the stop sign?' I said, 'Yeah, but I |
_o__) don't believe everything I read.' -- Steven Wright |
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) |
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scrutiny, over an extended time,
before deciding they'll be a net benefit.
--
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`\ Windows is a shell, and DOS is a boot partition virus. -- |
_o__) Peter H. Coffin |
Ben
:-)
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`\ of liberty. -- Thomas Jefferson |
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Francisco. I found someone's heart. -- Steven |
`\Wright |
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not deter the next. |
`\ Well, what of it? The first one is at least disposed of. -- |
_o__) Henry L. Mencken |
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Mike Meyer [EMAIL PROTECTED] wrote:
Ben Finney [EMAIL PROTECTED] writes:
Mike Meyer [EMAIL PROTECTED] wrote:
Lots of people seem to want immutable instances. Nobody seems to
have a use case for them.
Perhaps you missed my release announcement of the 'enum' package
that explains why Enum
Mike Meyer [EMAIL PROTECTED] wrote:
Ben Finney [EMAIL PROTECTED] writes:
Since the values of an enumeration are directly reflected in
the values and attributes, Enum instances are immutable to
preserve this relationship
This justifies making the attributes immutable
to get around it, all of which seem hackish to some degree.
--
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`\ counts. -- Will Rogers |
_o__) |
Ben Finney
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Duncan Booth [EMAIL PROTECTED] wrote:
Ben Finney wrote:
What is the common idiom here? I can conceive of several possible
ways to get around it, all of which seem hackish to some degree.
I don't know if it is the common idiom, but I tend to write:
TESTDIR = os.path.dirname
']
acc.flush()
Flushing items: ['strawberry']
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`\ we may have invented the net, we still don't really get it. |
_o__) -- Douglas Adams |
Ben Finney
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data needs to be tested.
How should this be resolved?
--
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`\ an exception. -- Groucho Marx |
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Ben Finney
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to meet them halfway by helping them help you.
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\ I put instant coffee in a microwave oven and almost went back |
`\ in time. -- Steven Wright |
_o__) |
Ben Finney
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Scott David Daniels [EMAIL PROTECTED] wrote:
Ben Finney wrote:
Summary: I'm looking for idioms in unit tests for factoring out
repetitive iteration over test data
How about something like:
class Test_Game(unittest.TestCase):
[...]
def runs(self, throws
the other day. They said my |
`\personality was weird. ... That's okay, I have four more. -- |
_o__)Bug-Eyed Earl, _Red Meat_ |
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Ben Finney [EMAIL PROTECTED] wrote:
Summary: I'm looking for idioms in unit tests for factoring out
repetitive iteration over test data.
Thanks to those who've offered suggestions, especially those who
suggested I look at generator functions. This leads to::
import unittest
import
|
`\ to. -- Elvis Aaron Presley (1935-1977) |
_o__) |
Ben Finney
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make you believe absurdities can make you commit |
`\ atrocities. -- Voltaire |
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values from different enumerations should not
compare?
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`\ |
_o__) |
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) |
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. -- |
`\ Donald Robert Perry Marquis |
_o__) |
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Antoon Pardon [EMAIL PROTECTED] writes:
Ben Finney wrote:
The 'enum' package in Cheeseshop [defines enumerations as]
sequences (of unique arbitrary values), that can be iterated and
tested for membership.
Sure but we do have this:
from enum import Enum
day = Enum('mon', 'tue', 'wed', 'thu
. -- Groucho Marx |
_o__) |
Ben Finney http://www.benfinney.id.au/
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|
`\ was glad to get rid of it. -- Groucho Marx |
_o__) |
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[EMAIL PROTECTED] writes:
Ben Finney wrote:
Is there some behaviour other than evaluate to False or raise an
exception, that could indicate not comparable?
Yes: return NotImplemented. Note that the == operator automagically
returns False in this case.
spam.__eq__(spam)
True
::
str(pizza_night)
'fri'
shirt_colour.index
2
--
\ It ain't so much the things we don't know that get us in |
`\ trouble. It's the things we know that ain't so. -- Artemus |
_o__) Ward (1834-67), U.S. journalist |
Ben Finney
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--
\There was a point to this story, but it has temporarily |
`\ escaped the chronicler's mind. -- Douglas Adams |
_o__) |
Ben Finney http://www.benfinney.id.au/
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things you learn from the internet |
`\ is that there is no 'them' out there. It's just an awful lot of |
_o__) 'us'. -- Douglas Adams |
Ben Finney
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) |
Ben Finney
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reply to the message
author.
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`\ limit of my action. -- Henry James |
_o__) |
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. -- Mahatma Gandhi (when |
`\asked what he thought of Western civilization) |
_o__) |
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) |
Ben Finney
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Peter Hansen [EMAIL PROTECTED] wrote:
Ben Finney wrote:
Roy Smith [EMAIL PROTECTED] wrote:
[current-directory module shadowing a system module]
All hail the coming of PEP 328:
URL:http://www.python.org/peps/pep-0328.html
Which, unless I misunderstand, would do nothing to change
Aahz [EMAIL PROTECTED] wrote:
Ben Finney [EMAIL PROTECTED] wrote:
So, under PEP 328 rules, the original poster's current-directory
module could only be imported (a) if the current directory was in
sys.path, or (b) if the code specified a relative import. The
accidental shadowing
the move. Day 2: Everybody |
_o__) talks to me like I'm an idiot.' -- Steven Wright |
Ben Finney http://www.benfinney.id.au/
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U.S. 624 (1943) |
_o__) |
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|
`\ |
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advanced bug is indistinguishable from a |
`\ feature. -- Rich Kulawiec |
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read, so I got |
`\ flip-ups. -- Steven Wright |
_o__) |
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about cutting |
`\ them down? We might, if they screamed all the time, for no good |
_o__) reason. -- Jack Handey |
Ben Finney
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)Hitch-Hiker's Guide To The Galaxy_, Douglas Adams |
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:
URL:http://dsbl.org/programs
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`\ is expensive at a penny. -- Cato, 234-149 BC, Relique |
_o__) |
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