On 5/11/19 5:02 PM, Ben Bacarisse wrote:
> Donald Tripdarlinq writes:
>
>> In the traditional Yoruba tribal Set-Up in Nigeria,West Africa the
>> tradition of inheritance is very important. Now, The relative position
>> of a child in the family counts when the issue of inheritance is
>> considered
nerated codes). All the various 'codepages' were useful in
their day, when machines were less capable, and Unicode hadn't been
invented or wasn't supported well or was too expensive to use.
Now (as I understand it), all Python (3) 'Strings' are internally
Unicode, if yo
On 6/30/19 4:00 AM, moi wrote:
> Le samedi 29 juin 2019 19:25:40 UTC+2, Richard Damon a écrit :
>>
>> Now (as I understand it), all Python (3) 'Strings' are internally
>> Unicode, if you need something with a different encoding it needs to be
>> in Bytes.
>&
On 6/30/19 10:04 AM, Chris Angelico wrote:
> On Sun, Jun 30, 2019 at 10:26 PM Richard Damon
> wrote:
>> On 6/30/19 4:00 AM, moi wrote:
>>
> I didn't see who you were quoting, but it looks like our old "Py3's
> Unicode is buggy" troll is back (or maybe
On Friday, July 12, 2019 at 11:04:57 AM UTC-4, sjm...@gmail.com wrote:
> On Friday, July 12, 2019 at 11:37:08 AM UTC-3, mok...@gmail.com wrote:
> > Can anyone help me.
> > New to Python.
> > Installed version 3.7
> > I purchased the "Python for Dummies" book But this book was written for an
> > ol
ble, as it relies on
changing the file name format would be to switch the file names to using
something like an ISO date format fo the name, ISO dates are in the
format -MM-DD (Month is a two digit number) which has the nice
attribute that the alphabetical sort is also a date sort.
If you can
e significant, that unless the join list
was built of exactly 1 character strings, the split won't match, and
that seems somewhat special case for a variable delimiter.
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Richard Damon
--
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atter on, the list is still
refering to that now changed dictionary.
Either you need to copy the dictionary, and add the new copy, or create
a new copy with each iteration of the loop.
At the end of the loop, ap_list is a list of all the same dictionary,
the same one that ap_dict is bound to, you just kept changing it every
time through the loop.
if ap_dict was set to a new empty dictionary in the loop, then all the
copies would be distinct.
--
Richard Damon
--
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licated history),
can be filled with all sorts of strangeness, and this can get compounded
when it wants to be harmonized with a technical subject which can't deal
with some of the naturalness of language, thus we can't try to use some
sort of rule matching the type of article to the appropriateness of the
python word "is".
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Richard Damon
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category, some part,
but the phrase "all the things", we aren't looking at any category, but
literally ALL the things. "All of the things" implies all of the things
within some group, possibly implied by context. The category "thing" is
implied by the word thing, so
ess it all depends on what you need to do. If you just need to
> check truthiness, just do "if greeting" If you need to know if the
> variable is some particular sentinel, use the "if greeting is whatever".
I thought the recommended value was None, not False (so you don't
On 7/28/19 8:25 PM, Chris Angelico wrote:
> On Mon, Jul 29, 2019 at 10:15 AM Richard Damon
> wrote:
>> On 7/28/19 7:46 PM, Michael Torrie wrote:
>>> On 7/28/19 5:55 AM, Jonathan Moules wrote:
>>>> But this appears to be explicitly called out as being "Wo
On 7/28/19 8:46 PM, Chris Angelico wrote:
> On Mon, Jul 29, 2019 at 10:43 AM Richard Damon
> wrote:
>> On 7/28/19 8:25 PM, Chris Angelico wrote:
>>> Of course, if the third value can be simplified away (eg None means
>>> "use the global default"), th
d the
0 duration, and after a human scale duration, doesn't perturb the value
enough to make much of a difference.
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Richard Damon
--
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f possible always create a new 'venv' and install the packages
in there instead of the system, it avoids polluting the environment and
makes it easier to tidy up unwanted packages at a later stage.
Hope this helps, Richard Moseley.
On Thu, 8 Aug 2019 at 16:03, Rich Shepard wrote:
on???
I don't think it has its own Python, but it sounds like it sort of
extends the file system, and uses a leading // for something special.
That means files that begin with // need to be processes through the
blender library and not be used directly to the OS.
--
Richard Damon
--
ately that is likely fine, and I've misread the event (provided
> gmane backfeeds to the mailing list).
I think gmane feed the newsgroup comp.lang.python which feeds
python-list@python.org. Python-list probably then sees that you already
were getting a direct copy so omits sending you
he C/C++
file scoped 'static' which is less bad that fully global variables (the
extern variable).
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GUI.py to test this and test1.py and
> test2.py are the files which can be used to import GUI .
To make the list persistent you need to create it as a module global or
as a class member of a persistent object (like your MainWindow)
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Richard Damon
--
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.
>
Well technically, def and class are statements that are executed when
the module is imported, you need to execute them to add the definitions
into the appropriate namespace.
Perhaps the 'rule' needs to be somewhat restated to a form where the
only thing that should execute when importing a module are the
statements needed to create the definitions for the module.
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Richard Damon
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this
is one case that shows it. x = x + 1 is an assignment to the symbol x,
which makes x a local, and thus the read becomes an undefined symbol. x
+= 1 is different, it isn't a plain assignment so doesn't create the
local. The read of x is inherently tied to the writing of x so x stays
referring to the global.
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Richard Damon
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On 9/19/19 6:52 AM, Eko palypse wrote:
> Am Donnerstag, 19. September 2019 12:45:35 UTC+2 schrieb Richard Damon:
>> On 9/19/19 6:16 AM, Eko palypse wrote:
>>>> In all cases, if the optional parts are omitted, the code is executed in
>>>> the current scope. ...
&
ze that I could avoid formatting problems in the
> dataframe or array simply by using the read_csv command with the
> correct parameters (sep and decimal).
>
> I searched for information about the meaning of the letter "b" in the
> parameter decimal=b',' but didn't find.
>
> I found that it also works without the letter b.
>
> Best Regards,
> Markos
The b indicates that the string is a 'bytes' string vs a text string.
This isn't so important to differentiate for ASCII characters, but can
make a difference if you have extended characters and the file might not
be in Unicode.
--
Richard Damon
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ple files
that exist at the same time (create the file and keep it open, unlink or
rename the file, and you can create another with the original name).
We also have relative paths, relative paths specify a file path relative
to something, but don't keep track of that something, and as such may
truly represent multiple real files.
These show that these paths CAN'T actually represent the files,
--
Richard Damon
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at purpose, like invalid.
If you want to use an invalid email address, then you could use
something like 'ast@invalid' or 'ast@email.invalid' and then you know
that you can't be accidentally impersonating someone else.
--
Richard Damon
--
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he right term here, but the
beginning of the documentation for Pathlib does sort of define what it
means here:
Path classes are divided between pure paths
<https://docs.python.org/3/library/pathlib.html#pure-paths>, which
provide purely computational operations without I/O, and concrete paths
<https://docs.python.org/3/library/pathlib.html#concrete-paths>, which
inherit from pure paths but also provide I/O operations.
So for Pathlib, Concrete means that it provides access to I/O operations
and thus can only handle paths of the flavor of the OS the program is
running on.
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Richard Damon
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UCS-4) at input (if
needed) and process in that domain. You do need to be prepared to run
into files which are encoded in some locally defined 8-bit code page. In
Python3, strings are unicode encoded, and you don't need to worry about
the details of which encoding is used internally, Python will deal with
that itself.
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Richard Damon
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on format for
floating point).
Scientific notation vs fixed point notation is purely an OUTPUT
configuration, not a function on how the number is stored (so in one
sense IS more closely linked to a string than the float itself).
--
Richard Damon
--
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print(x)
>> 4.449e-05
>>
>> hth
>> Gys
> Hello,
>
> I don't only need a human readable representation of number, I need to use it
> further, do things such as putting it in a pandas object and saving it to an
> excel file.
>
> Doing thi
On 10/18/19 9:03 AM, doganad...@gmail.com wrote:
> On Friday, October 18, 2019 at 2:21:34 PM UTC+3, Richard Damon wrote:
>> On 10/18/19 4:35 AM, doganad...@gmail.com wrote:
>>> Here is my question:
>>>
>>>
>>> I am using the numpy.std formula to calcul
On 10/18/19 9:45 AM, doganad...@gmail.com wrote:
> On Friday, October 18, 2019 at 4:17:51 PM UTC+3, Richard Damon wrote:
>> On 10/18/19 9:03 AM, doganad...@gmail.com wrote:
>>> On Friday, October 18, 2019 at 2:21:34 PM UTC+3, Richard Damon wrote:
>>>> On 10/18/19
#x27;t
> find document about it also:-(
>
> --Jach
The simple answer is that the attribute lookup happens at run time, not
compile time (unlike some other languages). Thus attributes/member
functions can be added by sub-classes, or even just to that instance at
run time an
mber takes more space to represent than the exponential. 1.2E-05 takes
7 characters, 0.15 takes 8 so the exponential is shorter.
As an aside, I would be very leery of numbers like 0.1 or 1e-05 as
they only show 1 significant digit, so unless I have good reason to
believe that they are exact numbers, I would have concern of them being
very imprecise, and possibly just noise.
--
Richard Damon
--
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mmunication between themselves, and you would need to manually add
what ever communication was needed.
A second option is to create a second thread, and do one if the imports
in that thread, and one in the main thread. This is likely the closest
to the stated goal, but likely, due to the GIL,
On Nov 14, 2019, at 12:18 PM, R.Wieser wrote:
>
> Rhodri,
>
>> MyVar is a global here, so nonlocal explicitly doesn't pick it up.
>
> I do not agree with you there (the variable being global). If it where than
> I would have been able to alter the variable inside the procedure without
> ha
>
> On Nov 14, 2019, at 12:20 PM, R.Wieser wrote:
>
> MRAB,
>
>> 'nonlocal' is used where the function is nested in another function
>
> The problem is that that was not clear to me from the description - nor is
> it logical to me why it exludes the main context from its use.
>
> Regards,
>
> On Nov 14, 2019, at 12:56 PM, R.Wieser wrote:
>
> Jan,
>
>> So what you want to do is dynamic scope?
>
> No, not really.I was looking for method to let one procedure share a
> variable with its caller - or callers, selectable by me. And as a "by
> reference" argument does not seem t
On 11/14/19 1:43 PM, R.Wieser wrote:
> Richard,
>
>> Assuming that one language works like another is a danger
> Abitrarily redefining words and using misnomers is another ... ("global"
> and "nonlocal" respecivily if you wonder)
>
>> First, Pytho
tion was looking for?
> Handle it the same as any other mistake, and throw an error ?
>
> Regards,
> Rudy Wieser
>
>
--
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--
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to a different model, and I think it helps to
accept that it is different rather than trying to keep trying to
translate how Python does things into how some other language does it,
as the latter make you focus on the things it can't do, not the things
it can.
--
Richard Damon
--
https://mail.python.org/mailman/listinfo/python-list
On 11/15/19 11:04 AM, Random832 wrote:
> On Fri, Nov 15, 2019, at 10:48, Richard Damon wrote:
>> On 11/15/19 6:56 AM, R.Wieser wrote:
>>> There are quite a number of languages where /every/ type of argument
>>> (including values) can be transfered "by referenc
return
then elsewhere you could do
foo(j)
and after that j is 2
you also could do
foo(1)
and after that if you did
j = 1
then now j might have the value 2 as the constant 1 was changed to the
value 2 (this can cause great confusion)
later I believe they added the ability to specify by value
On 11/15/19 12:21 PM, Random832 wrote:
> On Fri, Nov 15, 2019, at 11:47, Richard Damon wrote:
>> The issue with calling it a Reference, is that part of the meaning of a
>> Reference is that it refers to a Object, and in Python, Names are
>> conceptually something very much dif
ces, but that assignment, rather than being applied to the
referred to object, re-seat the reference to point to the new object. As
such, you can't get a reference to the name, to let one name re-seat
where another name refers to.
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Richard Damon
--
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Look at our code, and what controls the order you data is output. Change
it so that the data is processed in the order you want the output.
--
Richard Damon
--
https://mail.python.org/mailman/listinfo/python-list
On Nov 19, 2019, at 10:56 AM, Chris Angelico wrote:
>
> On Wed, Nov 20, 2019 at 2:46 AM wrote:
>>
>> Dne úterý 19. listopadu 2019 13:33:53 UTC+1 Richard Damon napsal(a):
>>>> On 11/19/19 6:47 AM, jezka...@gmail.com wrote:
>>>>> Hi, I have go
something fundamentally different than a
box to hold a value. If you show names as boxes with arrows in them,
someone is going to ask how to get one name point to another name (re
the discussion about is it call by value or call by reference)
--
Richard Damon
--
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a weighted average or weighted
standard deviation, I don't know scipy to know if it has something like
that built in. A quick scan shows that numpy.average allows a weighting
array to be provided, so it shouldn't be hard to look at the code for
sci[y.norm.fit and convert it to use weighted averages.
--
Richard Damon
--
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ely
using, as when objects go away there memory is returned to the free pool
INSIDE Python, to be used for other requests before asking the OS for more.
--
Richard Damon
--
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ubles as some packages become incompatible because one needs a
version greater than x, while another needs a version less than x.
--
Richard Damon
--
https://mail.python.org/mailman/listinfo/python-list
On Dec 2, 2019, at 12:32 PM, Chris Clark wrote:
>
> Test case:
>
> import array
> array.array('L', [0])
> # x.itemsize == 8 rather than 4
>
> This works fine (returns 4) under Windows Python 3.7.3 64-bit build.
>
> Under Ubuntu; Python 2.7.15rc1, 3.6.5, 3.70b3 64
types. Welcome to the ambiguity in the C type system, the basic
types are NOT fixed in size. L means 'Long' and as Christian said, that
is 8 byte long on Linux-64 bit. 'L' is exactly the right type for
interfacing with a routine defined as taking a long. The issue is that
you don
f
codepoints, the o and U+0301 (the accent).
If you want to make the strings compare equal then you need to make sure
that you have normalized both strings the same way. I beleive that the
Mac OS always converts file names into the NFD format when it uses them
(that is what the first (a) string is in)
--
Richard Damon
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uld of course use something like a while loop to build this, but
in my mind that is just making things less clear.
--
Richard Damon
--
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ical on some systems
using fixed length lines, so allowing a constant to be built on multiple
lines was useful.
--
Richard Damon
--
https://mail.python.org/mailman/listinfo/python-list
Can you elaborate on why you expect this? You've declared one of them
to have a single mandatory argument, and the other a single optional
argument. This corresponds to what I'm seeing.
ChrisA
So the square bracket means optional, not list? My misunderstanding:-(
--Jach
Yes, the norm
ule b needs resources from module a,
it needs to import module a before it can use them. If module a also
needs resources from module b, and imports it, then stuff from b might
not be available while doing the running of module a that is defining
the items in a.
--
Richard Damon
--
https:/
p.mutate() can change the value of the shared object, but there is no
way to make v refer to some new object.
The key distinction is that in Python, names are NOT objects, they only
bind to objects, and thus names can't refer to some other name to let us
rebind them remotely.
--
Richa
mes (for starting values of count = 0, 1, 2, 3, 4,
5, 6, 7, 8
Think about what you wanted to do and what the code actually did.
The first for x in range (0, 10) doesn't really do what I think you
wanted, did you mean for the second loop to be nested in it?
If you do nest the seco
while loop, which would add x
'x's to the string.
--
Richard Damon
--
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;t solve his problem, as his expected was lines
of 1 to 10 stars, not 0 to 9.
Second, this smells a bit like homework, and if they haven't learned the
results of string times integer, then using that operation wouldn't be
in their tool kit, so having a loop to build that operator makes sense.
--
Richard Damon
--
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be to take some byte value, (like FF) and where
ever it occurs in the compressed data, replace it with a doubled value
FF FF, and then add a single FF to the end.
--
Richard Damon
--
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function,
which uses some of the 'value' of the object, then presumably you intend
for objects where that 'value' matches to be equal, which won't happen
with the default __eq__.
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Richard Damon
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if the code was going to iterate through the success anyway, then
there isn't as much of a cost to detect the errors that occured.
--
Richard Damon
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On 3/7/20 12:52 PM, Ben Bacarisse wrote:
> moi writes:
>
>> Le samedi 7 mars 2020 16:41:10 UTC+1, R.Wieser a écrit :
>>> Moi,
>>>
Fortunately, UTF-8 has not been created the Python devs.
>>>
>>> And there we go again, making vague statements/accusations - without
>>> /anything/ to back it u
tive path, so the path is
relative to the SERVER, not the current page, so it would be
superhost.gr/mailform
The other format goes through a function which might re-interpret the
path and either make it page relative or add in the path of the current
page to get to /test/mailform
--
Ri
ce between words through the line. The varying spaces between words can
be a bit annoying, but it was done. My thought is that variable width fonts
tend to put more characters per inch. and with wider screens we are no longer
trying as hard to keep to less than 80 characters per line (or
> --
> Grant
>
>
>
Back in the day it was FREQUENTLY done, in part to show off, anyone
could type with a typewriter and get jagged right margins, but with a
computer you could get justified margins with uneven internal spacing!!
Status!
--
Richard Damon
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it is more important if the object quacks like a duck then if it
technically IS a duck. (And strangely, I believe you can have something
that technically is a duck, but doesn't quack like one, as well as
something totally unrelated to the duck type but quacks just like one).
Files are such an animal, 'fileness' is not based on type, but on
capability.
--
Richard Damon
--
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ara3.xml\\setup.py'"'"';
When I 'Google' the error - I find that there's an apparent bug
https://stackoverflow.com/questions/60937863/error-command-errored-out-with-exit-status-1
Doesn't sound like there's an easy workaround.
Richard
On Mon, Apr
ith reducing
precision. With Binary floating point, you only have denormals near
underflow.
Now Decimal Floating point doesn't have this implied leading 1, but can
have denormals at almost all of the ranges.
--
Richard Damon
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oint number has
only 1 significant digit (leading 0's are NOT significant), so the
second smallest floating point number is twice that number. The key is
that once you hit the denormals, you no longer have a relative accuracy
like in the normal numbers, but all the denormals have the same absolute
a
rs.
>
> grep '\bsnake_case\b *.py
>
> Barry
>
I think the issue is that you can easy search for all 'snake_case' and
get them, but you have more difficulty searching for all 'camelCase',
needing to go case insensitive, but if leading case matters (like there
a
veloctiy = solve(flowrate_fun, flowrate)
i.e. you pass a function and it finds what input make the function have
a give value.
--
Richard Damon
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ou should be checking for equality (==) not identity (is)
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Richard Damon
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al structure of the
Data Structure, and seeing the explicit pointers can be helpful here.
Python may be better for the Algorithms side, where hiding some of the
gritty detail can be more useful, though that hiding might obscure some
details if you want to think about what is the complexity of an
ng to a polynomial is
that you can get a closed form set of equations to solve to find the
'optimal' values.
The primary effect of transforming the data before doing the fit is the
error is now defined in terms of the difference of the transformed
values, not the original values. In many cases, this is actually a
reasonable way to define your error, so it works.
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Richard Damon
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that you may want to trim them out when
possible.
I would likely just build the formatter to start by assuming 6 week
months, and then near the end, after stacking the side by side months,
see if it can be trimmed out (easier to remove at the end then add if
needed)
--
Richard Damon
27;Academic' calendars that might start in July or August
and go to maybe the following September
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Richard Damon
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iar with what you are doing.
The second method would be to write a program to do this. Maybe use the
'canned' routine as a base for the program, but accept that your actual
desired output is unusual enough it won't be something you can get with
a single call. Maybe accept you can't get exactly what you want, so be
willing to accept something close. Maybe the chart goes from January of
your start year to December of the final year if the library likes doing
a full year at a time.
--
Richard Damon
--
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s
that requirement. To find that element in the dictionary, you would need
to build a tuple using that exact same me object, you couldn't create
another object, and set it to the same 'value', as they won't compare equal.
--
Richard Damon
--
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>): 23}
>>>>> hash(h)
>> 2
>>>>> hash(list(d.keys())[0])
>> -3550055125485641917
>>>>> h.a=33
>>>>> hash(list(d.keys())[0])
>> -3656087029879219665
>>>>>
> so the dict itself doesn't enforce immutability of its keys
Yes, here you have defined a hash that violates the requirements of the
Dictionary (and most things that use hashes) so your class is broken,
and you can expect to get strangeness out of your dictionary.
> --
> Robin Becker
>
--
Richard Damon
--
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ce you are not using an iterator of the list, changing it shouldn't
cause any problems. You loop (for its control) looks at the loop once,
before it starts, so as long as you don't delete any elements (which
would cause the index to go to high) you can't have an issue mutating
the li
at
least to the tuple, immutable, as the only part of it that matters is
the value of id() which WILL be unchanging.
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Richard Damon
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e of statement, so = can't
be misused in an expression thinking it means an equality test (and then
added recently the := operator, so that for the cases you actually want
to do assignments in the middle of an expression you can).
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Richard Damon
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n alleviate some of the issues
(at other costs).
--
Richard Damon
--
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On 8/7/20 12:52 PM, Marco Sulla wrote:
> About statement vs expression: maybe you, Richard and
> 2QdxY4RzWzUUiLuE, are right, maybe not. This is hard to say, since the
> official C documentation is not public and you have to pay a small fee
> to obtain it.
>
> Anyway, I said &qu
ng basically the
iterative solution, so that the recursive call to fir(0, ...) doesn't
actually calculate the fib(0) value, but fib(n).
Yes, this shows that you can convert an iterative solution into a
recursive solution with a bit of hand waving, but you still end up with
a program based on th
On 8/7/20 3:54 PM, Marco Sulla wrote:
> On Fri, 7 Aug 2020 at 19:48, Richard Damon wrote:
>> The difference is that the two languages define 'expression' differently.
>> [...]
> I don't know if this is interesting or pertinent to the topic.
>
> Christian Se
On 8/7/20 6:55 PM, Marco Sulla wrote:
> On Sat, 8 Aug 2020 at 00:28, Richard Damon wrote:
>> The really interesting part is that since Lisp programs manipulate lists
>> as data, and the program is just a list, Lisp programs have the
>> theoretical ability to edit the
#x27;Cc'] = ', '.join(CC_Address)
> msg['Subject'] = Subject_Email
>
> message = MIMEText(html,'html')
> msg.attach(message)
> mail.sendmail(From_Address, (To_Address + CC_Address), msg.as_string())
> [/python]
>
> In this case the variable Name is Tom and i want to include Tom in the email.
>
> Can anyone help?
>
> Still a newbie; approx 3 weeks playing with Python (cut and past most of this
> code)
>
> Any help will be greatly appericated.
>
> Thank you.
--
Richard Damon
--
https://mail.python.org/mailman/listinfo/python-list
On 8/8/20 10:58 AM, sammy.jackson...@gmail.com wrote:
> Thank you Richard for your response.
>
> I have moved all the text i want the user to see into the body of the email.
>
> I still cannot get my email to display the name.
>
> Name = "Tim"
>
> How wou
ted differently to get them
into clean html.
--
Richard Damon
--
https://mail.python.org/mailman/listinfo/python-list
On 8/9/20 6:22 PM, sammy.jackson...@gmail.com wrote:
> On Sunday, August 9, 2020 at 1:32:30 AM UTC+1, Richard Damon wrote:
>> On 8/8/20 8:03 PM, sammy.jackson...@gmail.com wrote:
>>> If i use place holders i.e. {0} and {1} where {0} is the name and {1} is
>>> the dataf
A few comments come to mind about this discussion about TCO.
First, TCO, Tail Call Optimization, is talking about something that is
an optimization.
Optimizations, are generally some OPTIONAL improvement in the method of
executing the code that doesn't alter its DEFINED meaning.
First big point,
asking how would it feel to be that 'slave node', maybe even
needing to wait for your 'master' to ask before you went to the
bathroom, or be considered to be 'malfunctioning'.
--
Richard Damon
--
https://mail.python.org/mailman/listinfo/python-list
er power, it has no
authority, except might, to enforce it. If we accept might as the right
and power to rule, we need to accept that it was and will be the right
and power, and accept what it brought and will bring.
--
Richard Damon
--
https://mail.python.org/mailman/listinfo/python-list
ou get the expected value) or
slightly lower (where you would get the top 'excluded' value listed).
This sort of unpredictability is part of the difficulty dealing with
floating point.
As was pointed out, you can scale the range, or build your own generator
to get what you want.
--
Richard Damon
--
https://mail.python.org/mailman/listinfo/python-list
Since the typical use of hash will be followed by a real equality test
if the hashes match, we don't need the level of a UUID
--
Richard Damon
--
https://mail.python.org/mailman/listinfo/python-list
sh(y) were random numbers, then how would this property be maintained?
>
> Or do UUID4 mean something else to you than a random number?
Looking up which UUID type 4 is, yes it is a random number, so could
only be applicable for objects that currently return id(), which could
instead make id
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