RE: hash() yields different results for different platforms

[Kerry, Richard]

 
The hash is not expected to be unique, it just provides a starting point
for another search (usually linear ?).  

See http://en.wikipedia.org/wiki/Hash_function


Helpfully,
Maybe,
Richard.




-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On
Behalf Of Piet van Oostrum
Sent: 12 July 2006 10:56
To: python-list@python.org
Subject: Re: hash() yields different results for different platforms

> Grant Edwards <[EMAIL PROTECTED]> (GE) wrote:

>GE> The low 32 bits match, so perhaps you should just use that
>GE> portion of the returned hash?

If the hashed should be unique, 32 bits is much too low if you have
millions of entries.
-- 
Piet van Oostrum <[EMAIL PROTECTED]>
URL: http://www.cs.uu.nl/~piet [PGP 8DAE142BE17999C4]
Private email: [EMAIL PROTECTED]
-- 
http://mail.python.org/mailman/listinfo/python-list
-- 
http://mail.python.org/mailman/listinfo/python-list

RE: Full splitting of a file's pathname

[Kerry, Richard]

Unless it's the sort of operating system that uses something like :

Sys$disk:[foo.bar.moo.lar]myfile.txt


(VaxVMS, from quite a few years ago)
And if I recall, the parsing function provided would also separate the
extension from the main part of the file's name.


Unhelpfully,
Richard.

 

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On
Behalf Of BartlebyScrivener
Sent: 10 July 2006 15:52
To: python-list@python.org
Subject: Re: Full splitting of a file's pathname

I don't know if it's "standard," but why not just:

dir = './foo/bar/moo/lar/myfile.txt'
dir.split('/')

['.', 'foo', 'bar', 'moo', 'lar', 'myfile.txt']

rd

-- 
http://mail.python.org/mailman/listinfo/python-list
-- 
http://mail.python.org/mailman/listinfo/python-list

RE: Illegal instruction or undefined symbol from import

[Kerry, Richard]

 
The only use I now for them is when you need to plot the sine of a sine.
Or possibly to calculate the frequency spectrum of this.

Ie 
x = a.sin( b.sin( y ) )

This is fundamental to Frequency Modulation.
I don't know if they apply anywhere else ?


Unhelpfully,
Richard.



-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On
Behalf Of Nick Maclaren
Sent: 05 July 2006 11:32
To: python-list@python.org
Subject: Re: Illegal instruction or undefined symbol from import


In article <[EMAIL PROTECTED]>,
Mathias Waack <[EMAIL PROTECTED]> writes:
|> 
|> > There's 
|> > a lot of somewhat obscure mathematical stuff that got into the
standard
|> > C lib. How often do you need Bessel functions?
|> 
|> Maybe each day. What is a Bessel function?;)

Some people use them all the time; there are specific physical problems 
where they are fundamental.  I have never used them, in 40 years of
wide-ranging experience in the scientific computing arena!  


Regards,
Nick Maclaren.
-- 
http://mail.python.org/mailman/listinfo/python-list
-- 
http://mail.python.org/mailman/listinfo/python-list