arrays in python

[Kermit Rose]

From: Kermit Rose
Date: 02/10/06 17:36:34
To: py*********@python.org
Subject: Arrays
Hello.

I want to write a program in python using integer arrays.

I wish to calculate formulas using 200 digit integers.

I could not find any documentation in python manual about declaring arrays.

I searched the internet

and found an example that said I must declare

from Numeric import *
and I downloaded a numerical python extension,

but still have not found a way to declare an array of given length.

The zeros function always gives me an error message.
Kermit < ke****@polaris.net >

[Schüle Daniel]

> I want to write a program in python using integer arrays.

you can :)

I wish to calculate formulas using 200 digit integers.
no problem
I could not find any documentation in python manual about declaring arrays.

I searched the internet
read here
http://diveintopython.org/native_data_types/lists.html

maybe list are what you are looking for
and found an example that said I must declare

from Numeric import *
yes, one can use Numeric for this taks too
and I downloaded a numerical python extension,

but still have not found a way to declare an array of given length.

The zeros function always gives me an error message.

import Numeric as N, random as rand
nums = [33 ** rand.randint(10,100) for i in range(200)]
len(nums) 200 nums[0] 16664658128640303915417329756770834417490089065467 26522024522041932256405404932170047036994592860856 233379702595619607481259213235163454890913L
a = N.array(nums)
len(a) 200 a[0] 16664658128640303915417329756770834417490089065467 26522024522041932256405404932170047036994592860856 233379702595619607481259213235163454890913L

by the way, you know you can use interactive Python iterpreter
and there is dir and help function
dir(a) ['__copy__', '__deepcopy__', 'astype', 'byteswapped', 'copy',
'iscontiguous', 'itemsize', 'resize', 'savespace', 'spacesaver',
'tolist', 'toscalar', 'tostring', 'typecode'] dir(nums) ['__add__', '__class__', '__contains__', '__delattr__', '__delitem__',
'__delslice__', '__doc__', '__eq__', '__ge__', '__getattribute__',
'__getitem__', '__getslice__', '__gt__', '__hash__', '__iadd__',
'__imul__', '__init__', '__iter__', '__le__', '__len__', '__lt__',
'__mul__', '__ne__', '__new__', '__reduce__', '__reduce_ex__',
'__repr__', '__reversed__', '__rmul__', '__setattr__', '__setitem__',
'__setslice__', '__str__', 'append', 'count', 'extend', 'index',
'insert', 'pop', 'remove', 'reverse', 'sort']

Regards, Daniel

[Steven D'Aprano]

On Fri, 10 Feb 2006 17:50:21 -0500, Kermit Rose wrote:

I want to write a program in python using integer arrays.

I wish to calculate formulas using 200 digit integers.
Must the integers have exactly 200 digits? If you multiply one of these
200-digit integers by ten, should it silently overflow, raise an
exception, or become a 201-digit integer?

[snip]
The zeros function always gives me an error message.

Oh, don't tell me, I love playing guessing games!

Is it a SyntaxError?

--
Steven.

[plahey]

> Oh, don't tell me, I love playing guessing games!

Don't you mean "No no... don't tell me. I'm keen to guess."

Sorry, I couldn't resist... :-)

(for those who just went huh?, see
http://www.aldo.com/sgt/CheeseShoppeSkit.htm)