• Math Notations, Computer Languages, and the “Form” in Formalism
http://xahlee.org/cmaci/notation/index.html
plain text version follows. (lacks links)
-
Math Notations, Computer Languages, and the “Form” in Formalism
Xah Lee, 2009-08-31
This page is a collection
2009-09-07
On Sep 5, 7:41 am, slawekk wrote:
> > Theorem provers
> > such as OCaml (HOL, Coq), Mizar does math formalism as a foundation,
> > also function as a generic computer language, but lacks abilities as a
> > computer algebra system or math notation representation.
>
> Isabelle's presenta
pybotwar is a fun and educational game where players
create computer programs to control simulated robots
to compete in a battle arena.
http://pybotwar.googlecode.com/
pybotwar uses pybox2d for the physical simulation,
and uses either pygame and pygsear or PyQt4 for the
visualization.
pybotwar
cleaned up the previous post.
• 〈HTML6, Your HTML/XML Simplified〉
http://xahlee.org/comp/html6.html
plain text version follows
--
HTML6, Your HTML/XML Simplified
Xah Lee, 2010-09-21
Tired of the standard bodies telling us what to do and change
On Sep 23, 1:18 am, smh wrote:
> The following is not exactly what you are looking for, but you might
> find it interesting.
>
> http://www.franz.com/support/tech_corner/xml-generator-blurb.html
>
> This blurb is an example of a self-embedding document.
> I've used this XML generator in many appli
Is it possible / easy to use PyQt with portable python?
I've done some googling and found one message that said
this is coming in the next version, but I can't find anything
on portablepython.com that mentions it.
Has anyone done this before? Have any better information
on how to set it up, or
here's a interesting toy list processing problem.
I have a list of lists, where each sublist is labelled by
a number. I need to collect together the contents of all sublists
sharing
the same label. So if I have the list
((0 a b) (1 c d) (2 e f) (3 g h) (1 i j) (2 k l) (4 m n) (2 o p) (4 q
r) (5 s
2010-09-26
On Sep 25, 11:17 pm, Paul Rubin wrote:
> Python solution follows (earlier one with an error cancelled). All
> crossposting removed since crossposting is a standard trolling tactic.
>
> from collections import defaultdict
>
> def collect(xss):
> d = defaultdict(list)
>
On Sep 26, 7:56 am, Sherm Pendley wrote:
> Jürgen Exner writes:
> > Alexander Burger wrote:
> >>In PicoLisp:
>
> > What the f does PicoLisp have to with Perl?
>
> It's Xah. He cross-posts in an attempt to start a language feud.
>
> Please don't feed the troll.
sorry i disagree. And please d
On Sep 26, 5:40 am, Spiros Bousbouras wrote:
> > And just for good measure, some «European style quotes» and “balanced smart
> > quotes” which I intend some day to try to convince people to start using
> > to eliminate the scourge of backslash escapes. But that's a topic for
> > another day.
>
>
2010-09-27
> For instance, this is far more convenient:
> [x+1 for x in [1,2,3,4,5] if x%2==0]
> than this:
> map(lambda x:x+1,filter(lambda x:x%2==0,[1,2,3,4,5]))
How about this:
LC(func, inputList, P)
compared to
[func for myVar in inputList if P]
the functional form is:
• shorter
• n
On Sep 27, 12:11 pm, namekuseijin wrote:
> On 27 set, 16:06, Xah Lee wrote:> 2010-09-27
>
> > > For instance, this is far more convenient:
> > > [x+1 for x in [1,2,3,4,5] if x%2==0]
> > > than this:
> > > map(lambda x:x+1,filter(lambda x:x%2==0,
On Sep 27, 9:34 pm, John Bokma wrote:
> Seebs writes:
>
> fup set to poster
>
> > On 2010-09-28, John Bokma wrote:
> >> Seebs writes:
> >>> On 2010-09-26, J?rgen Exner wrote:
> It was livibetter who without any motivation or reasoning posted Python
> code in CLPM.
>
> >>> Not exactly
xah wrote:
> in anycase, how's “do” not imperative?
On Sep 28, 6:27 am, namekuseijin wrote:
> > how's “do” a “named let”? can you show example or reference of that
> > proposal? (is it worthwhile?)
>
> I'll post it again in the hope you'll read this time:
>
> "
> (do ((i 0 (+ 1 i)) ; i initially
2010-09-28
On Sep 28, 12:07 pm, namekuseijin wrote:
> On 28 set, 14:56, Xah Lee wrote:
>
> > ultimately, all lang gets transformed at the compiler level to become
> > machine instructions, which is imperative programing in the ultimate
> > sense.
>
> > You
On Sep 29, 11:02 am, namekuseijin wrote:
> On 28 set, 19:38, Xah Lee wrote:
>
> > • “list comprehension” is a very bad jargon; thus harmful to
> > functional programing or programing in general. Being a bad jargon, it
> > encourage mis-communication, mis-understanding.
here's my experiences dealing with unicode in various langs.
Unicode Support in Ruby, Perl, Python, Emacs Lisp
Xah Lee, 2010-10-07
I looked at Ruby 2 years ago. One problem i found is that it does not
support Unicode well. I just checked today, it still doesn't. Just do
a web search o
2010-10-09
On Oct 9, 3:45 pm, Sean McAfee wrote:
> Xah Lee writes:
> > Perl's exceedingly lousy unicode support hack is well known. In fact
> > it is the primary reason i “switched” to python for my scripting needs
> > in 2005. (See: Unicode in Perl and Python)
>
On Sep 25, 9:05 pm, Xah Lee wrote:
> here's a interesting toy list processing problem.
>
> I have a list of lists, where each sublist is labelled by
> a number. I need to collect together the contents of all sublists
> sharing
> the same label. So if I have the list
>
TZMud is a Python MUD server.
http://tzmud.googlecode.com/
A MUD is a text-based virtual environment
accessed via telnet, or with a specialised
MUD client.
TZMud development is still in early stages,
focusing on API and server stability.
TZMud uses several high-quality Python
libraries to facil
A great piece about terminology in computer languages.
* 〈The Poetry of Function Naming〉 (2010-10-18) By Stephen Wolfram.
At: http://blog.stephenwolfram.com/2010/10/the-poetry-of-function-naming/
See also:
• 〈The Importance of Terminology's Quality In Computer Languages〉
http://xahlee.org/Un
On Oct 20, 4:52 am, Marc Mientki wrote:
> Am 20.10.2010 13:14, schrieb Xah Lee:
>
> > See also:
>
> > • 〈The Importance of Terminology's Quality In Computer Languages〉
> >http://xahlee.org/UnixResource_dir/writ/naming_functions.html
>
> > where i gave some
pure functional lang (e.g. haskell), i think lc is pretty bad.
here's the plain text version of my essay
What's List Comprehension and Why is it Harmful?
Xah Lee, 2010-10-14
This page explains what is List Comprehension, with examples from
several lang
On Oct 28, 12:59 am, Lawrence D'Oliveiro wrote:
> In message
> <3fe80ac4-b595-4bcb-96b9-9138b1ec5...@l17g2000yqe.googlegroups.com>,
>
> TheFlyingDutchman wrote:
> > On Oct 27, 4:55 pm, Lawrence D'Oliveiro
> > wrote:
>
> >> Would it be right to say that the only Lisp still in common use is the
>
On Oct 28, 1:42 am, p...@informatimago.com (Pascal J. Bourguignon)
wrote:
> sthueb...@googlemail.com (Stefan Hübner) writes:
> >> Would it be right to say that the only Lisp still in common use is the
> >> Elisp
> >> built into Emacs?
>
> > Clojure (http://clojure.org) is a Lisp on the JVM. It's g
On Oct 27, 5:46 pm, rantingrick wrote:
> On Oct 26, 4:31 am, Xah Lee wrote:
>
> > recently wrote a article based on a debate here. (can't find the
> > original thread on Google at the moment)
>
> Hey all you numbskulls who are contributing the annoying off-topic
&g
Writing a Dissertation requires mastery of research methods for valid
and reliable data collection, availability of all the resources and
perfection of dissertation format, structure and citation styles. This
article offers some guiltiness about how to write a winning
dissertation.
Dissertation Wr
Andrew Berg writes:
> This is probably somewhat off-topic, but where would I find a list of
> what each error code in WindowsError means? WindowsError is so broad
> that it could be difficult to decide what to do in an except clause.
> Fortunately, sys.exc_info()[1][0] holds the specific error co
Walter Chang writes:
> Hi
>
> is there any open source library for python that can allow application
> level monitoring ? For example,application can send per request level/
> aggregated monitoring events and some remote server dump it and show
> in the monitoring graph in real time ? What's be
Bastian Ballmann writes:
> Hi,
>
> the project sounds like the exact tool that i need but regarding the
> user manual one has to mark the points on the graph manually. Therefore
> it's more work to get the data out than doing it without a tool. Or may
> I miss something here?
> Greets
Read the d
Gregory Ewing writes:
> Hans Georg Schaathun wrote:
>> 0 is a number as real and existent as any other,
>> one would think that the empty list is also as real and existent as
>> any other list.
>
> 0 does have some special properties, though, such as
> being the additive identity and not having
I still like Python after using it for over a decade, but there are
things I don't like.
What are your favourite up-and-coming languages of the moment?
Here's my wishlist (not really in any order):
* A widely used standard for (optional) interface declaration -- or
something better. I wan
Daniel Kluev writes:
> On Sun, May 22, 2011 at 2:49 AM, John J Lee wrote:
>> Here's my wishlist (not really in any order):
>
> How come pony is not listed there? Language cannot be better than
> python without pony!
Pony, absolutely. I took that as read.
>>
def leftrotate(l, n):
return l[n:] + l[:n]
def rightrotate(l, n):
return l[-n:] + l[:-n]
def encode(s, k, kk):
l = [ord(i) for i in s]
return leftrotate(''.join([chr(i + k) for i in l]), kk)
def decode(s, k, kk):
l = [ord(i) for i in rightrotate(s, kk)]
return ''.join([ch
if run these function to decode in python interactive console,
it can decode correct,
but when run with a big project, it append a letter Y
On Monday, October 30, 2017 at 9:48:36 AM UTC+8, Ho Yeung Lee wrote:
> def leftrotate(l, n):
> return l[n:] + l[:n]
>
> def righ
>>> from Crypto.Cipher import AES
>>>
>>> key = 'mysecretpassword'
>>> plaintext = 'Secret Message A'
>>> encobj = AES.new(key, AES.MODE_ECB)
>>> ciphertext = encobj.encrypt("hello")
Traceback (most recent call last):
File "", line 1, in
File "C:\Python27\lib\site-packages\Crypto\Cipher\_mode_
i discover when
it
decode("\\",1,2)
in interactive console
is [
but decode in big project
it see as
decode(r"\\",1,2)
[[
it double
On Monday, October 30, 2017 at 9:51:01 AM UTC+8, Ho Yeung Lee wrote:
> if run these function to decode in python interactive console,
it seems that it read csv file
from "\\" to ""
On Monday, October 30, 2017 at 11:03:57 AM UTC+8, Ho Yeung Lee wrote:
> i discover when
> it
> decode("\\",1,2)
> in interactive console
> is [
>
> but decode in big project
> it see as
i fixed by replace("","\\")
On Monday, October 30, 2017 at 11:16:02 AM UTC+8, Igor Korot wrote:
> Hi,
>
> On Sun, Oct 29, 2017 at 10:03 PM, Ho Yeung Lee wrote:
> > i discover when
> > it
> > decode("\\",1,2)
> > in interactiv
tilizes the time zone and DST bias of the locale (equivalent to
Clock).
-- Due to this simplified behavior, the implementation does not require
-- expensive system calls on targets such as Windows.
-- WARNING: Split_At_Locale is no longer aware of historic events and
may
-- produce inaccu
of
changes would be required?
https://docs.python.org/3/library/2to3.html
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AGERETURN). Other languages on the
OS had different default file structures, but RMS would handle all of them
transparently.
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could show anything)
prompt> python C:\google-python-exercises\hello.py
INDIRECT
prompt> cd C:\google-python-exercises
C:\google-python-exercises> python hello.py
(note that the prompt has changed to reflect the CD of the first line)
In neither of t
587,776 Removepywin32.exe
08/25/2020 06:55 PM 123,848 update_check.exe
9 File(s) 3,143,672 bytes
0 Dir(s) 650,737,926,144 bytes free
C:\Users\Wulfraed>
Yes, it is an older version of the ActiveState release, but they did
install with the vari
e same.
The most likely guess would be that these items are not defined in your
PATH environment variable.
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IFCCEQqwIyCAghEBYQHRAeOgUIABCABDoOCC4QgAQQsQMQgwEQ1AI6CAgAEIAEELEDOhEILhCABBCxAxCDARDHARDRAzoICC4QgAQQsQM6CwgAEIAEELEDEIMBOggILhCxAxCDAToFCC4QgAQ6EQguEIAEELEDEIMBEMcBEKMCOgsILhCABBDHARCjAjoICC4QgAQQ1AI6CwguEIAEELEDEIMBOgsILhCABBCxAxDUAjoOCC4QsQMQgwEQxwEQowI6DgguEIAEELEDEMcBENEDOg4ILhCABBCxAxCDARDJAzoICAAQsQMQgwE6BwgAEIAEEAo6CAgAEIAEEMkDOgYIABAWEB46BQgAEIYDUL0NWNRZYO9caAFwAHgBgAHYAYgBpx6SAQcyNC4xMi4xmAEAoAEBsAEA&sclient=gws-wiz
>
>Thank you!
>
>Brent Hunter
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up, you have to make sure that the script and shortcut themselves are
not in protected (single user) locations.
Using the task scheduler, you'd have similar constraints on
directories, but shouldn't need to create a shortcut file. Instead, you'd
specify the pa
s behind-the-scenes modification to file data is fine for
text files, but will corrupt binary data like that in JPEG or EXE files. Be
very careful to use binary mode when reading and writing such files.
"""
--
Wulfraed Dennis
ft.com/en-us/cpp/text/support-for-unicode?view=msvc-170
)
For EBCDIC is still x0D, but is x25 (and there is a separate
[new line] at x15)
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Since your code does not specify BINARY mode in the open statement,
Python should be using TEXT mode.
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arch... Done
w-scan/oldstable 20170107-2 amd64
Channel scanning tool for DVB and ATSC channels
wulfraed@ElusiveUnicorn:~$
-=-=-
Install and test. Windows partitions are accessible as
/mnt/
--
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wlfr...@ix.netcom.com
protocol... You might need to locate the source code for
w_scan. Perhaps https://github.com/tbsdtv/w_scan
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bsequent I/O).
Interpretation of encoding appears to fall to the console driver
configuration when displaying the bytes output by tail.
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2.sourceforge.net/
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quot;
'\'"\''
>>> '''"'"'''
'"\'"'
>>>
(Note that the interactive console displays results using repr(), and hence
escapes ' that are internal to avoid conflict with the ones wrapping the
outpu
-readable str() you will need to write your own
output loop to do the formatting of the structure, and explicitly print
each item of the structure.
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me up with something using native data type methods -- and using
the overhead of re with just simple text [ie; nothing that might be called
an "expression" designed to match /varying/ content) seems really
inefficient.
--
Wulfraed Dennis Lee Bieber AF6
elifoperations.lower() == "x":
Is that REALLY what the code has? I'd expect
"elifoperations"
to produce a syntax error of some sort since there is no apparent space
between the "elif" and "operations".
{s
=-=-
Microsoft Windows [Version 10.0.19044.1706]
(c) Microsoft Corporation. All rights reserved.
C:\Users\Wulfraed>python
Python ActivePython 3.8.2 (ActiveState Software Inc.) based on
on win32
Type "help", "copyright", "credits" or "license" for more informa
t; whatAt(max, l)
(1, 3.1415923536)
>>>
(properly, I should either reverse the order of the return value, or change
the name to atWhat() )
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ile (removing any existing tag if one
exists).
"""
self.tag = id3.Tag()
self.tag.version = version
self.tag.file_info = id3.FileInfo(self.path)
return self.tag
... you probably need to be looking at
myID3.tag.
... try
cuments show attack/release settings acting as a limited AGC in
that it responds when transitions above and below threshold occur).
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ome RDBMs even have extensions for spatial data handling.
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e
* Compare filename and title.
* IF MATCHED -- done
* IF NOT MATCHED
* Format ID3 track number as shown above
* Compare filename to (formatted track number + track
title)
* IF MAT
, I'm out-of-date... I'm on v3.8 and .removeprefix() and
.removesuffix() (from v3.9) simplify my previous post... Instead of
if myString.lower().endswith(".mp3"): #lower() is a precaution for case
myString = myString[:-4]
just use
myString = myStr
some time laying
out the "form" in any decent word processor, and developing the suitable
mail-merge definitions and database. Or even a decent report-writer with a
relational database.
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wlfr...@ix.netcom.
On Tue, 14 Jun 2022 11:15:47 -0400, Dennis Lee Bieber
declaimed the following:
>On Tue, 14 Jun 2022 00:41:07 +0200, jak declaimed the
>following:
>
>>
>>https://www.guardiacostiera.gov.it/venezia/Documents/Bollettino%20MOD.%20TD123.pdf
>
> In
ticky=('EWNS'))
... please compare the spelling!
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ion of Python,
which was written in C... In contrast to things like Jython -- Python
implemented using Java.
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itten in C vs Java (Jython), C# (IronPython -- which M$ may be
deprecating these days, based on some stuff in my last Visual Studio
update), or other
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ense, a label will be combined with a button or entry
widget.
"""
https://tk-tutorial.readthedocs.io/en/latest/check/check.html#a-better-checkbutton-class
etc.
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tOn Tue, 21 Jun 2022 02:52:28 + (UTC), Avi Gross
declaimed the following:
>
>I don't even want to think fo what sound a C# Python would make.
A musical hiss on a frequency of 277.183Hz (for the C# above middle-C)
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Wulfraed Dennis Lee Bieber
ose for that was to differentiate from Python /language/
implemented in OTHER languages. IronPython is a M$ .NET/C# implementation,
Jython is a JVM/Java implementation.
When you just say "Python" you are referring to ALL of those
implementations.
--
Wulfraed
have historically been
outside of a user’s control, such as target platform, memory and threading
models, garbage collection strategies, and optimizations applied, including
whether or not to have a JIT in the first place.
"""
--
Wulfraed Den
ing on it will open a
console window, and that window will close when the program exits -- so
that option is often useless).
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NamedIntConstant, cls).__init__(cls, value)
>> self.name = name
>> return self
There does not appear to be any provision for keyword arguments at all.
The only use of "name" is to an undefined object.
--
Wulf
"named int", I'd expect value to the integer value of
this "constant" (and there should probably be a generic setter that... bars
changing value or name later). If a "name" keyword argument is not
supplied, using the str() of the value for the name might be valid
es.
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d once and then compiles with all major
C/C++ compilers in CPython 2.6, 2.7 (2.4+ with Cython 0.20.x) as well as
3.3 and all later versions.
"""
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mal code listing that someone could attempt to run to perform
debugging.
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t for their "app store" and
things like Visual Studio -- my machine, however, is not logged in using
the M$ account, just my local username.
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binary attachments on this forum. Plain text may make it through
(since you could just include it as the message itself).
But... since no hiring manager is reading here, there is no reason to
include it. You need to investigate sites that manage job postings.
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hat your really want the data to look like.
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as I can guess -- given the lack of example input
data, example /desired/ output... etc. There are too many apparent errors
in that code sample to even attempt to think what a result could be.
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st,
making a new list if the element attribute matches the criteria. Python
treats 0 as "false" and if no element matched, the list created is empty,
so len() is 0. Anything else implies a match was found.
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Wulfraed Dennis Lee Bieber AF6VN
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On Sat, 23 Jul 2022 18:16:20 +0200, nhlanhlah198506
declaimed the following:
>Can I update my python account Sent from my Galaxy
WHAT Python account?
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Wulfraed Dennis Lee Bieber AF6VN
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f that is something being passed to a
Windows command shell, the shell does not handle / (that's a command
OPTION), only \ for paths.
Have you navigated and proved you have such a file?
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Wulfraed Dennis Lee Bieber AF6VN
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honw.exe
PS C:\Users\Wulfraed>
That's from a stale ActiveState build... Anaconda may drop the "." in
the version (I'd expect it is python3.10.5)
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installed-package-with-python
provide any hints?
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g wrong?)
What happens with
system_randint = SystemRandom().randint #no parens
index = system_randint(...)
which may remove the method lookup from the repetition.
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Wulfraed Dennis Lee Bieber AF6VN
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ndint(1, len(to_try)) - 1
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Wulfraed Dennis Lee Bieber AF6VN
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ian/Ubuntu: apt install xxx, where xxx is not the native OS
Python)
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Wulfraed Dennis Lee Bieber AF6VN
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, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97,
98, 99]
>>>
This option works because the list is sequential integers and the index
matches the values in the list (.remove() removes the first MATCHING
element, so if the list can have duplicates is may not remove the one AT
the index position).
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Wulfraed Dennis Lee Bieber AF6VN
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list;
use some RDBM to keep the long-term data, accumulating it as you fetch it,
and letting the FFT read from the database for its processing.
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Wulfraed Dennis Lee Bieber AF6VN
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our network fetches as a transaction --
and close the transaction fast. Your FFT process would need to select all
data in the range to be processed, and load it into memory so you can free
that transaction
https://www.sqlite.org/lockingv3.html See section 3.0 and section 5.0
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Wulfra
ectly, a long running action /will/ delay
others -- which could mean the (FFT) process could block collecting new
1-second readings while it is active. It also is "one-shot" on the
scheduled actions, meaning those actions still have to reschedule
themselves for the next time period.
--
ady to attack.
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Wulfraed Dennis Lee Bieber AF6VN
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Uninstalling PyQt5-5.15.1:
Successfully uninstalled PyQt5-5.15.1
Successfully installed PyQt5-Qt5-5.15.2 pyqt5-5.15.4
pyqt5-plugins-5.15.4.2.2 pyqt5-tools-5.15.4.3.2 python-dotenv-0.20.0
qt5-applications-5.15.2.2.2 qt5-tools-5.15.2.1.2
C:\Users\Wulfraed>
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Wulfra
ation, by running the setup script as:
python setup.py bdist_msi
On Mac OS X, you can use bdist_dmg to build a Mac disk image.
"""
Note the command syntax and last line...
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