Py 3._x_
and
4.0](http://www.alcyone.com/software/empy/ANNOUNCE.html#full-list-of-changes-between-empy-3-x-and-4-0)
for a more comprehensive list.
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San Jose, CA, USA && 37 18 N 121 57 W && S
. Additional fix for source compatibility
between 2.x and 3.0.
- 3.3.1; 2014 Jan 22. Source compatibility for 2.x and 3.0;
1.x and Jython compatibility dropped.
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. Additional fix for source compatibility
between 2.x and 3.0.
- 3.3.1; 2014 Jan 22. Source compatibility for 2.x and 3.0;
1.x and Jython compatibility dropped.
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Erik Max Francis m...@alcyone.com http://www.alcyone.com/max/
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is
a decent piece of technology.
Agreed. The terror that most people feel when hearing m4 is because
m4 was associated with sendmail, not because m4 was inherently awful.
It has problems, but you'd only encounter them when doing something
_very_ abstract.
--
Erik Max Francis m...@alcyone.com http
.
Thank you!
PEP 8 says this is bad form. What do you think?
Where does it say that?
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I will always remember / This moment
-- Sade
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On 07/20/2012 02:05 AM, Virgil Stokes wrote:
On 20-Jul-2012 10:27, Steven D'Aprano wrote:
The fellow looked relived and said Oh thank god, I thought you said
*million*!
How does this relate to the python list?
It's also a seriously old joke.
--
Erik Max Francis m...@alcyone.com http
On 07/20/2012 03:28 AM, BartC wrote:
Erik Max Francis m...@alcyone.com wrote in message
news:gskdnwoqpkoovztnnz2dnuvz5s2dn...@giganews.com...
On 07/20/2012 01:11 AM, Steven D'Aprano wrote:
On Thu, 19 Jul 2012 13:50:36 -0500, Tim Chase wrote:
I'm reminded of Graham's Number, which is so
ginormous.)
You don't even need to go that high. Even a run-of-the-mill googol
(10^100) is far larger than the total number of elementary particles in
the observable Universe.
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Giampaolo Rodolà wrote:
Il 21 gennaio 2012 22:13, Erik Max Francis m...@alcyone.com ha scritto:
The real reason people still use the `while 1` construct, I would imagine,
is just inertia or habit, rather than a conscious, defensive decision. If
it's the latter, it's a case of being _way_ too
defensive.
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Ambition can creep as well as soar.
-- Edmund Burke
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` notation comes from back in the pre-Boolean
days. In any reasonably modern implementation, `while True` is more
self-documenting. I would imagine the primary reason people still do
it, any after-the-fact rationalizations aside, is simply habit.
--
Erik Max Francis m...@alcyone.com http
api(): pass
@__all__
def db(): pass
@__all__
def input(): pass
@__all__
def output(): pass
@__all__
def tcl(): pass
Bravo!
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San Jose, CA, USA 37 18 N 121 57 W AIM/Y!M/Jabber erikmaxfrancis
Smaller than the eye can see
Mel wrote:
Erik Max Francis wrote:
Chris Angelico wrote:
On Tue, Jun 28, 2011 at 12:56 PM, Steven D'Aprano
steve+comp.lang.pyt...@pearwood.info wrote:
Zero sig figure: 0
That's not really zero significant figures; without further
qualification, it's one.
Is 0.0 one sig fig or two?
Two
10^-8 kg, or on the order of 10^-8 kg (zero
significant figures). To convert to energy, multiply by c^2. c = 3 x
10^8 m/s, so c^2 = 9 x 10^16 m^2/s^2, or about 10^17 m^2/s^2, so the
Planck energy is on the order of 10^9 J. That's a calculation to zero
significant figures.
--
Erik Max
Mel wrote:
Erik Max Francis wrote:
Mel wrote:
By convention, nobody ever talks about 1 x 9.97^6 .
Not sure what the relevance is, since nobody had mentioned any such thing.
If it was intended as a gag, I don't catch the reference.
I get giddy once in a while.. push things to limits
curious as to
whether a zero sig figures value is ever useful.)
Yes. They're order of magnitude estimates. 1 x 10^6 has one
significant figure. 10^6 has zero.
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I
.
These aren't usually done in the e scientific notation, but it would
be something like 10^3 (if we assume ^ is exponentiation, not the Python
operator).
c^2 is 9 x 10^16 m^2/s^2 to one significant figure. It's 10^17 m^2/s^2
to zero (order of magnitude estimate).
--
Erik Max Francis m
Steven D'Aprano wrote:
On Thu, 16 Jun 2011 22:20:50 -0700, Erik Max Francis wrote:
[...]
Yes, which could be rephrased as the fact that `break` and `continue`
are restricted to looping control structures, so reusing `break` in this
context would be a bad idea. You know, kind of like the exact
Eric Snow wrote:
On Tue, Jun 14, 2011 at 5:51 PM, Erik Max Francis m...@alcyone.com wrote:
Ethan Furman wrote:
To me, too -- too bad it doesn't work:
c:\temp\python32\python early_abort.py
File early_abort.py, line 7
return
^
SyntaxError: 'return' outside function
Nor should
lookup where the keys are functions,
and execute the value. Even then, unless there are quite a lot of
cases, this may be overkill.
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I am not afraid / To be a lone
Chris Angelico wrote:
On Fri, Jun 17, 2011 at 8:07 AM, Erik Max Francis m...@alcyone.com wrote:
It's quite consistent on which control structures you can break out of --
it's the looping ones.
Plus functions.
No:
def f():
... break
...
File stdin, line 2
SyntaxError: 'break' outside
Chris Angelico wrote:
On Fri, Jun 17, 2011 at 9:29 AM, Erik Max Francis m...@alcyone.com wrote:
Chris Angelico wrote:
On Fri, Jun 17, 2011 at 8:07 AM, Erik Max Francis m...@alcyone.com wrote:
It's quite consistent on which control structures you can break out of --
it's the looping ones
execute some code, use `if`. If you want to indicate an
exceptional condition, raise an exception.
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Erik Max Francis m...@alcyone.com http://www.alcyone.com/max/
San Jose, CA, USA 37 18 N 121 57 W AIM/Y!M/Skype erikmaxfrancis
Human salvation lies in the hands of the creatively maladjusted
Max Francis m...@alcyone.com http://www.alcyone.com/max/
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Winners are men who have dedicated their whole lives to winning.
-- Woody Hayes
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Ian Kelly wrote:
On Thu, Jun 16, 2011 at 7:21 PM, Erik Max Francis m...@alcyone.com wrote:
Neither makes sense. `break` exits out of looping structures, which the
top-level code of a module most certainly is not.
Why does that matter? It seems a bit like arguing that the `in`
keyword can't
Ian Kelly wrote:
On Thu, Jun 16, 2011 at 10:24 PM, Erik Max Francis m...@alcyone.com wrote:
True. So let's use `in` to represent breaking out of the top-level code of
a module. Why not, it's not the first time a keyword has been reused,
right?
The point is, if it's not obvious already from
a great
deal of meaning.
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There is _never_ no hope left. Remember.
-- Louis Wu
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early_abort.py
File early_abort.py, line 7
return
^
SyntaxError: 'return' outside function
Nor should it. There's nothing to return out of.
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Erik Max Francis m...@alcyone.com http://www.alcyone.com/max/
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delta extended to the
reals. Kronecker deltas are used all the time over the reals; for
instance, in tensor calculus. Just because the return values are either
0 or 1 doesn't mean that their use is incompatible over reals (as
integers are subsets of reals).
--
Erik Max Francis m...@alcyone.com
and sets rely on equality to test for uniqueness of keys or
elements.
nan = float(nan)
nan == nan
False
In short, don't do that.
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San Jose, CA, USA 37 18 N 121 57 W AIM/Y!M/Skype erikmaxfrancis
There was never a good war
Albert Hopkins wrote:
On Sun, 2011-05-29 at 00:41 +0100, MRAB wrote:
1.0 == 1.0
True
float(nan) == float(nan)
False
I can't cite this in a spec, but it makes sense (to me) that two things
which are nan are not necessarily the same nan.
It's part of the IEEE standard.
--
Erik Max Francis
bases.
--
Erik Max Francis m...@alcyone.com http://www.alcyone.com/max/
San Jose, CA, USA 37 18 N 121 57 W AIM/Y!M/Skype erikmaxfrancis
They love too much that die for love.
-- (an English proverb)
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with a dimensionless argument, you either mean radians are
you've got bigger problems with the understanding of unit systems.
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San Jose, CA, USA 37 18 N 121 57 W AIM/Y!M/Skype erikmaxfrancis
Don't want you to leave / And I don't
Keith Thompson wrote:
Erik Max Francis m...@alcyone.com writes:
[...]
print c # floating point accuracy aside
299792458.0 m/s
Actually, the speed of light is exactly 299792458.0 m/s by
definition. (The meter and the second are defined in terms of the
same wavelength of light
aside
299792458.0 m/s
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In Heaven all the interesting people are missing.
-- Friedrich Nietzsche
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not passing anything. So it
shouldn't be a wonder that it won't accept any arguments.
If you don't intend to override the constructor in the parent class,
simply don't define it.
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Erik Max Francis m...@alcyone.com http://www.alcyone.com/max/
San Jose, CA, USA 37 18 N 121 57 W AIM/Y!M
? That's the argument being used against you, not the argument being
ascribed to you. You're getting confused about something, somewhere.
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Erik Max Francis m...@alcyone.com http://www.alcyone.com/max/
San Jose, CA, USA 37 18 N 121 57 W AIM/Y!M/Skype erikmaxfrancis
I wonder if heaven got
Patrick Maupin wrote:
On Mar 2, 9:20 pm, Erik Max Francis m...@alcyone.com wrote:
Patrick Maupin wrote:
On Mar 2, 5:36 pm, Steven D'Aprano st...@remove-this-
cybersource.com.au wrote:
You seem to be taking the position that if you start with a config file
config.json, it is too hard to edit
acronym indicates that it is already a bridge too
far; we don't need more.
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San Jose, CA, USA 37 18 N 121 57 W AIM/Y!M/Skype erikmaxfrancis
It's better to be quotable than to be honest.
-- Tom Stoppard
--
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. You don't own this or
any other thread.
--
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San Jose, CA, USA 37 18 N 121 57 W AIM/Y!M/Skype erikmaxfrancis
It's better to be quotable than to be honest.
-- Tom Stoppard
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is unreadable, so must be RSON.
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San Jose, CA, USA 37 18 N 121 57 W AIM/Y!M/Skype erikmaxfrancis
It's better to be quotable than to be honest.
-- Tom Stoppard
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pradeep wrote:
I have this file in linux
===
sample.py
#!/usr/bin/env python
name = blah
print name
...
Any one knows , whats the syntax error here?
You're indenting for no reason.
--
Erik Max Francis m...@alcyone.com http://www.alcyone.com/max/
San Jose, CA
True
What you're seeing is simply the short-circuiting behavior of the `and`
and `or` operators; they return the last (relevant) value they
encountered before making their determination of the value of the
overall expressions. See python.org/doc for more information.
--
Erik Max Francis m
the answer they're looking for. The former is
surely just laziness, but there's something psychological going on with
the latter.
--
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Nine worlds I remember
it was not a
suggestion to change Python.
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Mona Lisa / Come to discover / I am your daughter
-- Lamya
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, with `fi` written instead of `endif` -- not sure
why the difference in keyword is that big of a deal to you.
As others have pointed out, either way, there are quite a few languages
that use this type of syntax.
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San Jose, CA, USA
which can directly return this information.
The .count string method.
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Diplomacy and defense are not substitutes for one another. Either
alone would fail. -- John
.
--
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San Jose, CA, USA 37 18 N 121 57 W AIM/Y!M/Skype erikmaxfrancis
Diplomacy and defense are not substitutes for one another. Either
alone would fail. -- John F. Kennedy, 1917-1963
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to, just as with 3.0.
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Nothing spoils a confession like repentence.
-- Anatole France
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object is pretty much never useful. The
other canonical use of `is` would be comparison to `None`, which is also
perfectly appropriate.
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When the solution
works, the short
version is, don't worry about them, as you won't be using them.
I'm really rather surprised at the number of questions about them.
They're really something one does not need to worry about.
--
Erik Max Francis m...@alcyone.com http://www.alcyone.com/max/
San Jose, CA, USA 37
Andre Engels wrote:
The reverse function is a function to reverse the list in place, not a
function to get the reverse of the list:
x = [1,2,3,4]
y = x
z = x.reverse()
will result in:
x = y = [4,3,2,1]
z = None
.reverse returns None. See the documentation.
--
Erik Max Francis m
. Variations of `else if` in `if ... else if ...` chains is
routine in computer languages. Choosing a deliberately different syntax
just for the sake it of is obtuse at best.
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go. But you can't pretend like it's the obvious mathematical
meaning just because the usual mathematical meaning doesn't apply, which
is what you seem to be doing.
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in the series can indicate the
radix, whichever method you choose above). It's the same as for
strings, and it's the common SI recommendation for thousands separators
anyway.
--
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no sense, which is what makes the
syntax unambiguous. An extended numeric literal continues the radix of
wherever it started.
--
Erik Max Francis m...@alcyone.com http://www.alcyone.com/max/
San Jose, CA, USA 37 18 N 121 57 W AIM/Y!M/Skype erikmaxfrancis
Do not seek death. Death will find
huge confusion on a regular basis that upsets a lot of users? Nope.
--
Erik Max Francis m...@alcyone.com http://www.alcyone.com/max/
San Jose, CA, USA 37 18 N 121 57 W AIM/Y!M/Skype erikmaxfrancis
Do not seek death. Death will find you.
-- Dag Hammarskjold
--
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James Harris wrote:
On 24 Aug, 09:05, Erik Max Francis m...@alcyone.com wrote:
Here's another suggested number literal format. First, keep the
familar 0x and 0b of C and others and to add 0t for octal. (T is the
third letter of octal as X is the third letter of hex.) The numbers
above would
Max Francis m...@alcyone.com http://www.alcyone.com/max/
San Jose, CA, USA 37 18 N 121 57 W AIM/Y!M/Skype erikmaxfrancis
Do not seek death. Death will find you.
-- Dag Hammarskjold
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Hendrik van Rooyen wrote:
I also tried to include an example of a literal with a base of a Googol but I
ran out of both ink and symbols.
:-)
... or particles in the observable Universe, for that matter.
--
Erik Max Francis m...@alcyone.com http://www.alcyone.com/max/
San Jose, CA, USA 37
.
--
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If the sky should fall, hold up your hands.
-- (a Spanish proverb)
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colons?
Is it necessary?
I dealt with it. Had to change 'w:bz2' into 'w|bz2'.
But now have another problem:
It's the same problem, asked and answered. Why not read the replies of
the people telling you what the problem is?
--
Erik Max Francis m...@alcyone.com http://www.alcyone.com/max
main problem here).
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Every human being is a problem in search of a solution.
-- Ashley Montague
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variable being at the end of expression is going to
get much play, since not a single major one I'm familiar with does it
that way, and a lot of them have come up with the same convention
independently and haven't seen a need to change.
--
Erik Max Francis m...@alcyone.com http
Douglas Alan wrote:
Personally, my favorite is Lisp, which looks like
(set! y (+ y 1))
For varying values of Lisp. `set!` is Scheme.
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Erik Max Francis m...@alcyone.com http://www.alcyone.com/max/
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Get there first
newlines.
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It's hard to say what I want my legacy to be when I'm long gone.
-- Aaliyah
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Grant Edwards wrote:
On 2009-08-14, Erik Max Francis m...@alcyone.com wrote:
Grant Edwards wrote:
On 2009-08-14, Steven D'Aprano st...@remove-this-cybersource.com.au wrote:
What the hell
would it actually do???
IIRC in C++,
cout Hello world;
is equivalent to this in C:
printf
with a special-purpose language where
everything is really a form of an generalized array representation of
something _anyway_.
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Scars are like memories. We do
matrices are mathematically equivalent.
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Gods are born and die, but the atom endures.
-- Alexander Chase
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that such a feature of a
language would a priori be poor design. It _isn't_ poor design for
special purpose languages. Python isn't one of them, but Matlab _is_.
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Erik Max Francis m...@alcyone.com http://www.alcyone.com/max/
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More fodder
to
verify you have a valid tensor equation using it.
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If the sky should fall, hold up your hands.
-- (a Spanish proverb)
--
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, etc.
Even if you restrict yourself to base-b expansions (for which the
statement is true for integer bases), you can cheat there too: e is 1
in base e.
--
Erik Max Francis m...@alcyone.com http://www.alcyone.com/max/
San Jose, CA, USA 37 18 N 121 57 W AIM, Y!M, Skype erikmaxfrancis
, and the foreword he
wrote to the Apple Numerics Manual, 2nd Edition, published in 1988? It's
such a classic piece that I think it should be posted somewhere...
I only see used versions of it available for purchase. Care to hum a
few bars?
--
Erik Max Francis m...@alcyone.com http
their functionality in detail.
--
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The hour which gives us life begins to take it away.
-- Seneca
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object, so successive
calls to .next give you success iteration values like you intended.
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San Jose, CA, USA 37 18 N 121 57 W AIM, Y!M erikmaxfrancis
We must all hang together, or, most assuredly, we will all hang
separately
) posts is steadily dropping
over time.
If you look at http://mail.python.org/pipermail/python-list/ it doesn't
make it clear that there is any sort of decline.
...
And made all purdy-like:
http://www.alcyone.com/tmp/python-list%20traffic.pdf
--
Erik Max Francis m...@alcyone.com
)
'x'
repr(xx[0])
'x'
repr(xx[0][0])
'x'
But that's not what repr indicates. The bytearray element is apparently
being promoted to bytes as soon as it comes out of the array.
There's no distinction byte type. A single character of a bytes type is
also a bytes.
--
Erik Max Francis m
there
is some keyword that I don't know about.
No. The assignment operator with a bare name on the left hand side is
not overridable.
You can override attribute access, however, with
.__getattr__/.__getattribute__.
--
Erik Max Francis m...@alcyone.com http://www.alcyone.com/max/
San Jose
been nice to be able to do that.
Look up the function call syntaxes with * and **:
def foo(*args): print args
...
def bar(**keywords): print keywords
...
foo(1, 2, 3)
(1, 2, 3)
bar(a=1, b=2, c=3)
{'a': 1, 'c': 3, 'b': 2}
--
Erik Max Francis m...@alcyone.com http://www.alcyone.com/max/
San
, since functions
(procedures) take a fixed number of arguments. Parentheses are only
required when you're adding optional arguments.
--
Erik Max Francis m...@alcyone.com http://www.alcyone.com/max/
San Jose, CA, USA 37 18 N 121 57 W AIM, Y!M erikmaxfrancis
Conversation is the enemy
alex23 wrote:
On Jan 16, 5:39 pm, Erik Max Francis m...@alcyone.com wrote:
Inform 7 has some
interesting ideas, but I think the general problem with English-like
programming language systems is that once you get into the nitty gritty
details, you end up having to know exactly the right things
programming language syntax. In the big picture I don't think it helps
much. After all, there's a reason that most modern programming
languages don't look like COBOL or AppleScript.
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Erik Max Francis m...@alcyone.com http://www.alcyone.com/max/
San Jose, CA, USA 37 18 N 121 57 W AIM, Y
implementation dependent when and under what circumstances
fundamental immutable objects are reused, and it's not useful anyway;
what you care about is whether two objects are equal or not, not whether
they're the same object through some optimization behind the scenes.
--
Erik Max Francis m
(especially since
the term _identity_ isn't even used in remotely the same way) is simply
ignoring the fact that other people either won't know what you mean or
will presume you're misunderstanding something. Because, based on your
previous comments, you are.
--
Erik Max Francis m
objects are the same as each other.
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Erik Max Francis m...@alcyone.com http://www.alcyone.com/max/
San Jose, CA, USA 37 18 N 121 57 W AIM, Y!M erikmaxfrancis
Scars are like memories. We do not have them removed.
-- Chmeee
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Derek Martin wrote:
On Fri, Jan 02, 2009 at 12:50:44PM -0800, Erik Max Francis wrote:
Identity isn't defined on math objects, only on Python objects; there
is no notion of 'is' in math.
This is also false, it even has its own operator (which requires
Unicode to display): ≡
That can mean
the interpreter
refused to do that ?
Because, as in most languages, it's not even clear what you might mean
by this syntax. It doesn't have any meaning; assignments are made to
variables, not the results of function calls.
--
Erik Max Francis m...@alcyone.com http://www.alcyone.com/max/
San Jose
Filip Gruszczyński wrote:
I would like to iterate over a sequence nad ignore all None objects.
The most obvious way is explicitly checking if element is not None,
but it takes too much space.
That doesn't make much sense; why would iterating over the sequence take
more _space_?
--
Erik Max
,
for that matter.
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Erik Max Francis m...@alcyone.com http://www.alcyone.com/max/
San Jose, CA, USA 37 18 N 121 57 W AIM, Y!M erikmaxfrancis
God grant me to contend with those that understand me.
-- Thomas Fuller
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.
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Erik Max Francis [EMAIL PROTECTED] http://www.alcyone.com/max/
San Jose, CA, USA 37 18 N 121 57 W AIM, Y!M erikmaxfrancis
There are not fifty ways of fighting, there is only one: to be the
conqueror. -- Andrew Malraux, 1937
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about # and !=? Last I heard,
they were all part of Python.
None of these are identifiers at all. You might want to read up on the
language reference to see what an identifier actually is.
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Erik Max Francis [EMAIL PROTECTED] http://www.alcyone.com/max/
San Jose, CA, USA 37 18 N 121 57 W
Lawrence D'Oliveiro wrote:
gavino wrote:
which is nicer?
If I were to lock you and INTERCAL in a room until only one is left alive, who
do you think would survive?
The rest of us.
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Erik Max Francis [EMAIL PROTECTED] http://www.alcyone.com/max/
San Jose, CA, USA 37 18 N 121 57 W
because of his simplicity in comparison with c++. Maybe People
would like him even more it would be a bit more simple but the same
powerfull.
The problem is your suggestion would make Python a worse tool, not a
better one.
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Erik Max Francis [EMAIL PROTECTED] http://www.alcyone.com/max/
San
five men make in two weeks?).
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Erik Max Francis [EMAIL PROTECTED] http://www.alcyone.com/max/
San Jose, CA, USA 37 18 N 121 57 W AIM, Y!M erikmaxfrancis
Those who forget the past are condemned to repeat it.
-- George Santayana
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happens with any other sequence
type as the right-hand operand; for instance, tuples:
a = []
a += (1, 2, 3)
a
[1, 2, 3]
a = []
a = a + (1, 2, 3)
Traceback (most recent call last):
File stdin, line 1, in ?
TypeError: can only concatenate list (not tuple) to list
--
Erik Max Francis [EMAIL
?
No, it means you actually have a file named 'EN*' in the directory.
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Erik Max Francis [EMAIL PROTECTED] http://www.alcyone.com/max/
San Jose, CA, USA 37 18 N 121 57 W AIM, Y!M erikmaxfrancis
Many would be cowards if they had courage enough.
-- Thomas Fuller
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it isn't doing what you think it should.
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Erik Max Francis [EMAIL PROTECTED] http://www.alcyone.com/max/
San Jose, CA, USA 37 18 N 121 57 W AIM, Y!M erikmaxfrancis
It's better to be quotable than to be honest.
-- Tom Stoppard
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, or combination of data structures. That's not what
dictionaries are for.
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Erik Max Francis [EMAIL PROTECTED] http://www.alcyone.com/max/
San Jose, CA, USA 37 18 N 121 57 W AIM, Y!M erikmaxfrancis
Well I have been puppetized / Oh how I have compromised
-- Lamya
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structure works. If you're doing this an awful lot
-- whether testing for inclusion or iterating -- then you're probably
using the wrong data structure.
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Erik Max Francis [EMAIL PROTECTED] http://www.alcyone.com/max/
San Jose, CA, USA 37 18 N 121 57 W AIM, Y!M erikmaxfrancis
Well I have
`
creates a list which is not really what you need.
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Erik Max Francis [EMAIL PROTECTED] http://www.alcyone.com/max/
San Jose, CA, USA 37 18 N 121 57 W AIM, Y!M erikmaxfrancis
You and I / We've seen it all / Chasing our hearts' desire
-- The Russian and Florence, _Chess_
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