On Fri, 28 Feb 2014 09:43:58 +0200, Marko Rauhamaa wrote:
Chris Angelico ros...@gmail.com:
Simple rule of thumb: Never use 'is' with strings or ints. They're
immutable, their identities should be their values. Playing with 'is'
will only confuse you, unless you're specifically going for
Steven D'Aprano st...@pearwood.info writes:
On Fri, 28 Feb 2014 09:43:58 +0200, Marko Rauhamaa wrote:
class Connection:
IDLE = IDLE
[...]
CONNECTED = CONNECTED
[...]
def disconnect(self):
...
if self.state is CONNECTED:
On Fri, Feb 28, 2014 at 6:34 PM, Steven D'Aprano st...@pearwood.info wrote:
On Fri, 28 Feb 2014 16:00:10 +1100, Chris Angelico wrote:
If we had some other tag, like 'd', we could actually construct a
Decimal straight from the source code. Since source code is a string,
it'll be constructed
Mark H. Harris harrismh777 at gmail.com writes:
On Thursday, February 27, 2014 10:26:59 PM UTC-6, Chris Angelico wrote:
Create Decimal values from strings, not from the str() of a float,
which first rounds in binary and then rounds in decimal.
Thanks Chris... another excellent
On Fri, Feb 28, 2014 at 6:43 PM, Marko Rauhamaa ma...@pacujo.net wrote:
Here's a use case for is with strings (or ints):
class Connection:
IDLE = IDLE
CONNECTING = CONNECTING
CONNECTED = CONNECTED
DISCONNECTING = DISCONNECTING
DISCONNECTED =
On Fri, 28 Feb 2014 14:49:07 +1100, Alec Taylor wrote:
Are there libraries for doing this?
I would like to autogenerate JSON-schema for use inside an API explorer.
However whenever there is a schema change; I would only like to change
the schema in one place (where possible).
E.g.: For
Ben Finney ben+pyt...@benfinney.id.au:
There are two reasons why I think this is *still* not a justification
for using ‘is’ with string values:
First reason: This is better done by making it clear the value is an
arbitrary object that won't be compared for equality. Just use
‘object()’ to
On Fri, Feb 28, 2014 at 9:02 PM, Marko Rauhamaa ma...@pacujo.net wrote:
Yes, enums are long overdue. However, since any distinct objects will
do, there is nothing preventing you from using string objects.
String literals will often be interned if they look like (especially,
if they *are*)
On Fri, Feb 28, 2014 at 9:02 PM, Marko Rauhamaa ma...@pacujo.net wrote:
PS On the topic of enums, when are we getting support for a switch
statement?
I don't see that they're particularly connected. In my C code, I've
used enums frequently as quick constants, often never switching on
them.
Chris Angelico ros...@gmail.com:
String literals will often be interned if they look like (especially,
if they *are*) identifiers, so if you want to prevent other strings
from happening to match, you can't trust 'is'.
[...]
If you're using strings as state values, you should be using == to
Chris Angelico ros...@gmail.com:
Python currently has dispatch tables and if/elif chains, and a strong
cultural aversion to switch. You could change that by coming up with
some *really* awesome proposal, but you'll be fighting against the
tide a bit.
It's easy have a cultural aversion when
On Fri, Feb 28, 2014 at 10:30 PM, Marko Rauhamaa ma...@pacujo.net wrote:
Chris Angelico ros...@gmail.com:
String literals will often be interned if they look like (especially,
if they *are*) identifiers, so if you want to prevent other strings
from happening to match, you can't trust 'is'.
On Fri, Feb 28, 2014 at 10:38 PM, Marko Rauhamaa ma...@pacujo.net wrote:
Chris Angelico ros...@gmail.com:
Python currently has dispatch tables and if/elif chains, and a strong
cultural aversion to switch. You could change that by coming up with
some *really* awesome proposal, but you'll be
Chris Angelico ros...@gmail.com:
On Fri, Feb 28, 2014 at 10:30 PM, Marko Rauhamaa ma...@pacujo.net wrote:
Chris Angelico ros...@gmail.com:
a.state = a.INIT
In theory, yes. If that's all people will ever do, then you can safely
use == to check. Why are you using is?
The main reason to
On 2014-02-28, Marko Rauhamaa ma...@pacujo.net wrote:
Chris Angelico ros...@gmail.com:
Python currently has dispatch tables and if/elif chains, and a
strong cultural aversion to switch. You could change that by
coming up with some *really* awesome proposal, but you'll be
fighting against the
Neil Cerutti ne...@norwich.edu:
Check out Go's switch statement for an example of what it might
look like in Python. Except you'd get it without labeled break or
the fallthrough statement.
No need for the fallthrough (except that multiple cases should be
supported).
Labeled breaks wouldn't
On 2014-02-28, Ben Finney ben+pyt...@benfinney.id.au wrote:
Mark H. Harris harrismh...@gmail.com writes:
So, yeah, thinking about variables is just not going away.
Right. I would like, ideally, for the Python documentation to
avoid mentioning that term entirely; and I would hope for that
to
On Thursday, February 27, 2014 2:33:35 AM UTC-8, Mark H. Harris wrote:
No... was not aware of gmpy2... looks like a great project! I am wondering
why it would be sooo much faster?
For multiplication and division of ~1000 decimal digit numbers, gmpy2 is ~10x
faster. The numbers I gave were
On Sat, Mar 1, 2014 at 1:26 AM, Marko Rauhamaa ma...@pacujo.net wrote:
Python isn't averse to the switch statement because it would be not
that useful. Rather, the problem is that Python doesn't have nonliteral
constants (scheme has builtin symbols). It is difficult to come up with
truly
On 27 February 2014 16:14, Chris Angelico ros...@gmail.com wrote:
On Fri, Feb 28, 2014 at 3:01 AM, Eric Jacoboni eric.jacob...@gmail.com
wrote:
a_tuple = (spam, [10, 30], eggs)
a_tuple[1] += [20]
Traceback (most recent call last):
File stdin, line 1, in module
TypeError: 'tuple' object
Mark H. Harris harrismh777 at gmail.com writes:
If you get a chance, take a look at the dmath.py code on:
https://code.google.com/p/pythondecimallibrary/
Hi Mark,
here is an enhancement for your epx function.
Your current version comes with the disadvantage of potentially storing
On Sat, Mar 1, 2014 at 1:41 AM, Joshua Landau jos...@landau.ws wrote:
Would it be better to add a check here, such that if this gets raised
to the top-level it includes a warning (Addition was inplace;
variable probably mutated despite assignment failure)?
That'd require figuring out whether
Uhh, the curse of not copy-pasting everything:
exp(20)
should, of course, read
epx(19)
Traceback (most recent call last):
File pyshell#46, line 1, in module
epx(19)
File C:\Python34\dmath_rev.py, line 27, in epx
n *= q
decimal.Overflow: [class
On 28/02/2014 11:38, Marko Rauhamaa wrote:
Switch statements provide for excellent readability in parsers and state
machines, for example. They also allow the Python compiler to optimize
the statement internally unlike long if-else chains.
There are umpteen recipes for switch statements so
On Fri, 28 Feb 2014 19:52:45 +1100, Chris Angelico wrote:
On Fri, Feb 28, 2014 at 6:34 PM, Steven D'Aprano st...@pearwood.info
wrote:
On Fri, 28 Feb 2014 16:00:10 +1100, Chris Angelico wrote:
If we had some other tag, like 'd', we could actually construct a
Decimal straight from the source
On 02/28/2014 01:46 AM, Ben Finney wrote:
Steven D'Aprano st...@pearwood.info writes:
On Fri, 28 Feb 2014 09:43:58 +0200, Marko Rauhamaa wrote:
class Connection:
IDLE = IDLE
[...]
CONNECTED = CONNECTED
[...]
def disconnect(self):
...
if
Chris Angelico ros...@gmail.com:
Can you elaborate on this nonliteral constants point? How is it a
problem if DISCONNECTING isn't technically a constant? It follows the
Python convention of being in all upper-case, so the programmer
understands not to rebind it. Is the problem that someone
On Sat, Mar 1, 2014 at 2:11 AM, Steven D'Aprano
steve+comp.lang.pyt...@pearwood.info wrote:
or there needs to be a system for constructing literals
of non-built-in types. And if Decimal becomes built-in, then why that
and not insert type name here?
'Cos we have ten fingers and in count in
On Sat, Mar 1, 2014 at 2:29 AM, Marko Rauhamaa ma...@pacujo.net wrote:
BTW, here's a syntax that doesn't introduce any new keywords:
with self.state from Connection.State:
if CONNECTING or CONNECTED:
...
elif DISONNECTING:
...
else:
On Thursday, February 27, 2014 7:49:07 PM UTC-8, Alec Taylor wrote:
Are there libraries for doing this?
I would like to autogenerate JSON-schema for use inside an API explorer.
However whenever there is a schema change; I would only like to change
the schema in one place (where possible).
On Fri, 28 Feb 2014 12:02:03 +0200, Marko Rauhamaa wrote:
PS On the topic of enums, when are we getting support for a switch
statement?
http://legacy.python.org/dev/peps/pep-3103/
http://legacy.python.org/dev/peps/pep-0275/
--
Steven
--
On Friday, February 28, 2014 9:50:09 AM UTC-6, Steven D'Aprano wrote:
PS On the topic of enums, when are we getting support for a switch
statement?
http://legacy.python.org/dev/peps/pep-3103/
http://legacy.python.org/dev/peps/pep-0275/
I have reviewed these peps, and I heard Guido's
On Friday, February 28, 2014 8:41:49 AM UTC-6, Wolfgang Maier wrote:
Hi Mark,
here is an enhancement for your epx function.
Wolfgang
hi Wolfgang, thanks much! As a matter of point in fact, I ran into this
little snag and didn't understand it, because I was thinking that outside of
On Friday, February 28, 2014 2:54:12 AM UTC-6, Wolfgang Maier wrote:
Since by now, I guess, we all agree that using the string representation is
the wrong approach, you can simply use Decimal instead of D() throughout
your code.
Best,
Wolfgang
hi Wolfgang, ...right... I'm going to
On Friday, February 28, 2014 9:11:49 AM UTC-6, Steven D'Aprano wrote:
Now that Python has a fast C implementation of Decimal, I would be
happy for Python 4000 to default to decimal floats, and require special
syntax for binary floats. Say, 0.1b if you want a binary float, and 0.1
for a
On Sat, Mar 1, 2014 at 5:34 AM, Mark H. Harris harrismh...@gmail.com wrote:
Yes. ... and for clarification back to one of my previous comments, when I
refer to 'float' I am speaking of the IEEE binary floating point
representation built-in everywhere... including the processor!... not
Mark H. Harris harrismh...@gmail.com:
I think the real issue is about the syntax... because of python's
unique indent strategy going back to ABC, a pythonized switch
statement would play havoc with the many text parsers out there used
for development (TestWrangler, and many others).
I also
On Sat, Mar 1, 2014 at 5:53 AM, Marko Rauhamaa ma...@pacujo.net wrote:
A dict dispatch table is just awful.
Really? How is that? I've used them, often. Yes, there are times when
I could express something more cleanly with a C-style switch
statement, but other times the dispatch table is
Chris Angelico ros...@gmail.com:
On Sat, Mar 1, 2014 at 5:53 AM, Marko Rauhamaa ma...@pacujo.net wrote:
A dict dispatch table is just awful.
Really? How is that? I've used them, often. Yes, there are times when
I could express something more cleanly with a C-style switch
statement, but
On Friday, February 28, 2014 12:37:37 PM UTC-6, Chris Angelico wrote:
Are you aware that IEEE 754 includes specs for decimal floats? :)
Yes. I am from back in the day... way back... so 754 1985 is what I have
been referring to.
IEEE 854 1987 and the generalized IEEE 754 2008 have
On Friday, February 28, 2014 1:34:27 AM UTC-6, Steven D'Aprano wrote:
Now that Python has a fast C implementation of Decimal, I would be happy
for Python 4000 to default to decimal floats, and require special syntax
for binary floats. Say, 0.1b if you want a binary float, and 0.1 for a
On Friday, February 28, 2014 1:39:11 PM UTC-6, Mark H. Harris wrote:
On Friday, February 28, 2014 1:34:27 AM UTC-6, Steven D'Aprano wrote:
Now that Python has a fast C implementation of Decimal, I would be happy
for Python 4000 to default to decimal floats, and require special syntax
On Friday, February 28, 2014 1:20:52 PM UTC-6, Marko Rauhamaa wrote:
Which do *you* find more readable?
Yep, my point exactly. nice illustration.
--
https://mail.python.org/mailman/listinfo/python-list
Mark H. Harris harrismh...@gmail.com:
Yep, my point exactly. nice illustration.
So now, for you and me: let's compare.
if key is ast.Assign:
return ' '.join(dump(t) for t in node.targets)
elif key is ast.AugAssign:
# Same target and same operator.
return
On 28/02/2014 21:03, Marko Rauhamaa wrote:
Mark H. Harris harrismh...@gmail.com:
Yep, my point exactly. nice illustration.
So now, for you and me: let's compare.
if key is ast.Assign:
return ' '.join(dump(t) for t in node.targets)
elif key is ast.AugAssign:
#
On Fri, 28 Feb 2014 20:53:15 +0200, Marko Rauhamaa wrote:
Mark H. Harris harrismh...@gmail.com:
I think the real issue is about the syntax... because of python's
unique indent strategy going back to ABC, a pythonized switch statement
would play havoc with the many text parsers out there
Mark Lawrence breamore...@yahoo.co.uk:
http://c2.com/cgi/wiki?SwitchStatementsSmell
Your brief summary, please, Mark?
Anyway, the first 1000 lines or so that I managed to read from that page
stated a valid principle, which however doesn't invalidate the existence
of a switch statement.
A
Marko Rauhamaa ma...@pacujo.net writes:
Ben Finney ben+pyt...@benfinney.id.au:
First reason: This is better done by making it clear the value is an
arbitrary object that won't be compared for equality. Just use
‘object()’ to creeate each value and be done with it. That's a hack,
but
Neil Cerutti ne...@norwich.edu writes:
On 2014-02-28, Ben Finney ben+pyt...@benfinney.id.au wrote:
Right. I would like, ideally, for the Python documentation to
avoid mentioning that term entirely; and I would hope for that
to promote a better understanding of Python's data model.
I like
On Fri, 28 Feb 2014 21:20:52 +0200, Marko Rauhamaa wrote:
Your example:
[snip]
I'm not going to show the example as quoted by you, because my news
client is wrapping it in ugly ways and I don't want to spend the time
fixing it. I'll just say that, as given, it's a great big wall of text, a
On Friday, February 28, 2014 3:03:25 PM UTC-6, Marko Rauhamaa wrote:
Marko
... and between me and you, here is a snip from dmath.py from the atan(x)
function:
if (n**2 D(1)):
a = __atan__(n)
elif (n == D(1)):
a = gpi/4
elif (n == D(-1)):
a = -(gpi/4)
Marko Rauhamaa ma...@pacujo.net writes:
Mark Lawrence breamore...@yahoo.co.uk:
http://c2.com/cgi/wiki?SwitchStatementsSmell
Your brief summary, please, Mark?
Anyway, the first 1000 lines or so that I managed to read from that page
stated a valid principle, which however doesn't
Steven D'Aprano steve+comp.lang.pyt...@pearwood.info:
You can't have it both ways: you cannot claim that switch or case is
more readable than a chain of if...elif, and then propose a syntax
which is effectively a chain of if...elif while still claiming it is
an improvement. It's not. All
Ben Finney ben+pyt...@benfinney.id.au:
As has been pointed out to you, the whole point here is that string
objects often *are not* distinct, despite conceptually having distinct
cretion in the source.
You know full well that this initialization creates references to
distinct objects:
On Thursday, February 27, 2014 10:01:39 AM UTC-6, Eric Jacoboni wrote:
('spam', [10, 30, 20], 'eggs')
I get a TypeError for an illegal operation, but this operation is still
completed?
hi Eric, others have answered your question specifically, but the issue (which
is recurring) begs a
On Fri, 28 Feb 2014 14:25:54 +0200, Marko Rauhamaa wrote:
Chris Angelico ros...@gmail.com:
On Fri, Feb 28, 2014 at 10:30 PM, Marko Rauhamaa ma...@pacujo.net
wrote:
Chris Angelico ros...@gmail.com:
a.state = a.INIT
In theory, yes. If that's all people will ever do, then you can safely
Hi, I would like to know which is the best framework to persist my python
objects in disk.
I heard about ZODB (http://www.zodb.org/en/latest/index.html)
is this the best or there is another ?
--
Ariel Argañaraz
--
https://mail.python.org/mailman/listinfo/python-list
Mark H. Harris harrismh...@gmail.com:
if (n**2 D(1)):
a = __atan__(n)
elif (n == D(1)):
a = gpi/4
elif (n == D(-1)):
a = -(gpi/4)
elif (n D(-1)):
a = __atan__Lt_neg1__(n)
else:
a = __atan__Gt_1__(n)
Drop the outermost
On 2/28/14 6:36 PM, Mark H. Harris wrote:
On Friday, February 28, 2014 3:03:25 PM UTC-6, Marko Rauhamaa wrote:
Marko
... and between me and you, here is a snip from dmath.py from the atan(x)
function:
if (n**2 D(1)):
a = __atan__(n)
elif (n == D(1)):
a =
On Sat, 01 Mar 2014 02:03:51 +0200, Marko Rauhamaa wrote:
Steven D'Aprano steve+comp.lang.pyt...@pearwood.info:
You can't have it both ways: you cannot claim that switch or case is
more readable than a chain of if...elif, and then propose a syntax
which is effectively a chain of if...elif
Marko Rauhamaa ma...@pacujo.net writes:
Ben Finney ben+pyt...@benfinney.id.au:
As has been pointed out to you, the whole point here is that string
objects often *are not* distinct, despite conceptually having distinct
cretion in the source.
You know full well that this initialization
Ariel Argañaraz arieli...@gmail.com writes:
Hi, I would like to know which is the best framework to persist my
python objects in disk.
The Python Wiki has a directory of tools for object persistence in
Python URL:https://wiki.python.org/moin/PersistenceTools.
--
\ “Our task must be to
On Sat, 01 Mar 2014 02:11:53 +0200, Marko Rauhamaa wrote:
Ben Finney ben+pyt...@benfinney.id.au:
As has been pointed out to you, the whole point here is that string
objects often *are not* distinct, despite conceptually having distinct
cretion in the source.
You know full well that this
On 01/03/2014 00:40, Ned Batchelder wrote:
On 2/28/14 6:36 PM, Mark H. Harris wrote:
On Friday, February 28, 2014 3:03:25 PM UTC-6, Marko Rauhamaa wrote:
Marko
... and between me and you, here is a snip from dmath.py from the
atan(x) function:
if (n**2 D(1)):
a =
Steven D'Aprano steve+comp.lang.pyt...@pearwood.info:
I can only imagine you mean something like this:
class Outer:
class InnerOne:
...
class InnerTwo:
...
class InnerThree:
...
No, I mean this:
class StateMachine:
def __init__(self):
On Friday, February 28, 2014 6:40:06 PM UTC-6, Ned Batchelder wrote:
I don't understand: you show an if/elif chain that cannot be expressed
as a switch statement (because it uses ), and then conclude that
Python needs a switch statement? That doesn't make any sense.
Forgive me. I
Ben Finney ben+pyt...@benfinney.id.au:
From each other, of course they're distinct, because they are unequal.
They are *not* necessarily distinct from other strings with equal
value, defined elsewhere. That's what has been pointed out to you many
times.
That point is completely irrelevant.
On 01/03/2014 00:03, Marko Rauhamaa wrote:
Dict dispatch tables are elegant, attractive and efficient if you are
using pre-existing functions or functions you can create using lambda:
I beg to differ. The dict dispatch tables are very hard to read. The
fully blown-out if-else chain beats it
On 01/03/2014 01:10, Marko Rauhamaa wrote:
Ben Finney ben+pyt...@benfinney.id.au:
From each other, of course they're distinct, because they are unequal.
They are *not* necessarily distinct from other strings with equal
value, defined elsewhere. That's what has been pointed out to you many
Le 01/03/2014 01:22, Mark H. Harris a écrit :
I'll address the second first by asking a question... should an immutable
type (object) be able to hold (contain) mutable objects ... should tuples be
allowed to hold lists?
lists within a tuple should be converted to tuples.If you want
On Friday, February 28, 2014 7:10:49 PM UTC-6, Mark Lawrence wrote:
I think you're talking nonsense. I've been happily using dict dispatch
tables for years and, like Steven and presumably many others, find them
dead easy to read. Perhaps you should invest in a better optician
and/or
On Sat, Mar 1, 2014 at 11:22 AM, Mark H. Harris harrismh...@gmail.com wrote:
lists within a tuple should be converted to tuples.If you want a tuple to
hold a list, make it a list in the first place. Tuples should not be
changed... and as you point out... half changing a tuple is not a
Marko Rauhamaa ma...@pacujo.net writes:
Ben Finney ben+pyt...@benfinney.id.au:
They are *not* necessarily distinct from other strings with equal
value, defined elsewhere. That's what has been pointed out to you
many times.
That point is completely irrelevant. The state objects only need
On Sat, Mar 1, 2014 at 6:20 AM, Marko Rauhamaa ma...@pacujo.net wrote:
Your example:
compare_key = {
# Same target(s).
ast.Assign: lambda node: ' '.join(dump(t) for t in node.targets),
# Same target and same operator.
ast.AugAssign: lambda node:
On Sat, 01 Mar 2014 03:06:38 +0200, Marko Rauhamaa wrote:
Steven D'Aprano steve+comp.lang.pyt...@pearwood.info:
I can only imagine you mean something like this:
class Outer:
class InnerOne:
...
class InnerTwo:
...
class InnerThree:
...
No, I
On Sat, Mar 1, 2014 at 10:06 AM, Marko Rauhamaa ma...@pacujo.net wrote:
A colleague of mine taught me decades back that the whole point of OO
was the avoidance of if and switch statements. So if your code has an if
or switch statement, chances are you are doing something wrong.
I agree.
On Sat, Mar 1, 2014 at 12:08 PM, Mark H. Harris harrismh...@gmail.com wrote:
On Friday, February 28, 2014 6:40:06 PM UTC-6, Ned Batchelder wrote:
I don't understand: you show an if/elif chain that cannot be expressed
as a switch statement (because it uses ), and then conclude that
Python
On Sat, Mar 1, 2014 at 12:59 PM, Steven D'Aprano
steve+comp.lang.pyt...@pearwood.info wrote:
However, the example as given won't quite work. You never instantiate the
Idle etc. classes, which means the methods won't work. You need to make
them class methods or static methods, or perform some
On 2/28/14 8:08 PM, Mark H. Harris wrote:
On Friday, February 28, 2014 6:40:06 PM UTC-6, Ned Batchelder wrote:
I don't understand: you show an if/elif chain that cannot be expressed
as a switch statement (because it uses ), and then conclude that
Python needs a switch statement? That
Ben Finney wrote:
That whole chapter of the tutorial talks about “variable” and “variable
assignment”, when IMO it should avoid those terms and use the clearer
terminology of “reference”, “name”, and “binding a name to a value”.
What about all the other things that can be assigned
to but
Mark H. Harris wrote:
if (n**2 D(1)):
a = __atan__(n)
elif (n == D(1)):
a = gpi/4
elif (n == D(-1)):
a = -(gpi/4)
elif (n D(-1)):
a = __atan__Lt_neg1__(n)
else:
a = __atan__Gt_1__(n)
That's not a candidate for a switch statement,
On Sat, 01 Mar 2014 13:03:53 +1100, Chris Angelico wrote:
On Sat, Mar 1, 2014 at 12:59 PM, Steven D'Aprano
steve+comp.lang.pyt...@pearwood.info wrote:
However, the example as given won't quite work. You never instantiate
the Idle etc. classes, which means the methods won't work. You need to
Gregory Ewing greg.ew...@canterbury.ac.nz writes:
Ben Finney wrote:
That whole chapter of the tutorial talks about “variable” and “variable
assignment”, when IMO it should avoid those terms and use the clearer
terminology of “reference”, “name”, and “binding a name to a value”.
What
On Friday, February 28, 2014 8:15:38 PM UTC-6, Ned Batchelder wrote:
Mark, if you are going to advocate for a feature, find a good use case,
this one is absurd. Where did the constants GT_1 etc, come from?
Not at all. Think of the C switch block... if you read about it in the K R
you'll
On Friday, February 28, 2014 7:27:17 PM UTC-6, Eric Jacoboni wrote:
I agree with that too... My error was to first consider the list, then
the tuple... I should have considered the tuple first...
Anyway, the TypeError should rollback, not commit the mistake.
I believe so too, but I'm not one
On Fri, Feb 28, 2014 at 5:22 PM, Mark H. Harris harrismh...@gmail.com wrote:
I really think this is a bug; honestly. IMHO it should be an error to use
+= with an immutable type and that means not at all. In other words, the
list should not even be considered, because we're talking about
On Fri, Feb 28, 2014 at 6:27 PM, Eric Jacoboni eric.jacob...@gmail.com wrote:
Anyway, the TypeError should rollback, not commit the mistake.
The Python interpreter isn't a database. It can't rollback the object
because the operation that was performed may not be reversible.
Consider for example
On Friday, February 28, 2014 8:01:45 PM UTC-6, Chris Angelico wrote:
Does your switch construct have to handle the magic of GT_1 meaning
1, or do you first figure out where it falls with an if/elif tree?
ChrisA
hi Chris, yeah... well think again of the switch block in C... the switch
On Fri, Feb 28, 2014 at 9:45 PM, Mark H. Harris harrismh...@gmail.com wrote:
I really believe IMHO that the error should have come when you made the list
an item of a tuple. An immutable object should have NO REASON to contain a
mutable object like list... I mean the whole point is to
On Friday, February 28, 2014 11:34:56 PM UTC-6, Ian wrote:
One very common example of tuples containing lists is when lists are
passed to any function that accepts *args, because the extra arguments
are passed in a tuple. A similarly common example is when returning
multiple objects from a
On Friday, February 28, 2014 11:16:18 PM UTC-6, Ian wrote:
How would you propose doing that? Bear in mind that while Python
knows that tuples specifically are immutable, it doesn't generally
know whether a type is immutable.
hi Ian, consider the problem... its a cake and eat it too
On Sat, Mar 1, 2014 at 4:30 PM, Mark H. Harris harrismh...@gmail.com wrote:
hi Chris, yeah... well think again of the switch block in C... the switch
block selects a branch based on an integral number (int character) that is
generally a return code from a function. The function hides all
On Sat, Mar 1, 2014 at 5:16 PM, Mark H. Harris harrismh...@gmail.com wrote:
This is what I mean... the error message is telling the user that it cannot
do what he has requested, and yet IT DID. You have one of two scenarios:
1) the message is arbitrarily lying and it really can assign an
On Friday, February 28, 2014 11:16:18 PM UTC-6, Ian wrote:
How would you propose doing that? Bear in mind that while Python
knows that tuples specifically are immutable, it doesn't generally
know whether a type is immutable.
I was going to bed, and then thought of the solution. Allow the
hugocoolens hugocool...@gmail.com writes:
It often happens I start a python-script I wrote some time ago on another
system and get messages like module_x is missing. I then perform an
apt-cache search module_x, followed by an apt-get install
name_of_missing_module.deb
I was wondering
Terry Reedy tjre...@udel.edu writes:
On 2/27/2014 7:07 AM, Mark H. Harris wrote:
Oh, and one more thing... whoever is doing the work on IDLE these
days, nice job! It is stable, reliable, and just works/
appreciate it!
As one of 'them', thank you for the feedback. There are still some
Hello, i am working on a project for learning python and I’m stuck. The
directions are confusing me. Please keep in mind I’m very ne to this. The
directions are long so I’ll just add the paragraphs I’m confused about and my
code if someone could help me out I’d greatly appreciate it! Also,
Scott W Dunning swdunn...@cox.net writes:
Hello, i am working on a project for learning python and I’m stuck.
The directions are confusing me. Please keep in mind I’m very ne to
this.
Scott, please default to asking these “covered in a beginner Python
course” questions at the Python tutor
Changes by Westley Martínez aniko...@gmail.com:
--
nosy: +westley.martinez
___
Python tracker rep...@bugs.python.org
http://bugs.python.org/issue20580
___
___
Christian Heimes added the comment:
Thanks to Hynek we were able to dig deeper into Apple's modifications. OpenSSL
on OSX uses TEA (TrustEvaluationAgent) to verify cert chains. TEA is pretty
much undocumented on the internet but perhaps we can use it to verify certs
with OpenSSL 1.x, too?
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