RE: creating lists in Python

["Andre DeAngelis" <andre.deangelis(at)ubisoft.com>]

It's Windows XP 32.

I get errors yes.  Like running Python scripts without Python installed.

Thank you Marc-André , I will check the registry for these entries.  If not, what then?

Andre

-----Original Message-----
From: owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM] On Behalf Of Marc-André Belzile
Sent: April 13, 2007 5:25 PM
To: XSI(at)Softimage.COM
Subject: RE: creating lists in Python

Linux or Windows ? Make sure you have admin priviledges on Windows or write-access to /tmp/gen_py on linux.

Do you get any errors when running pyscript.py ?

You should have more or less these entries in the registry. 

[HKEY_CLASSES_ROOT\CLSID\{DF630910-1C1D-11d0-AE36-8C0F5E000000}]
(at)="Python ActiveX Scripting Engine"

[HKEY_CLASSES_ROOT\CLSID\{DF630910-1C1D-11d0-AE36-8C0F5E000000}\Debugging]
(at)="0"

[HKEY_CLASSES_ROOT\CLSID\{DF630910-1C1D-11d0-AE36-8C0F5E000000}\Implemented Categories]

[HKEY_CLASSES_ROOT\CLSID\{DF630910-1C1D-11d0-AE36-8C0F5E000000}\Implemented Categories\{B3EF80D0-68E2-11D0-A689-00C04FD658FF}]

[HKEY_CLASSES_ROOT\CLSID\{DF630910-1C1D-11d0-AE36-8C0F5E000000}\Implemented Categories\{F0B7A1A1-9847-11CF-8F20-00805F2CD064}]

[HKEY_CLASSES_ROOT\CLSID\{DF630910-1C1D-11d0-AE36-8C0F5E000000}\Implemented Categories\{F0B7A1A2-9847-11CF-8F20-00805F2CD064}]

[HKEY_CLASSES_ROOT\CLSID\{DF630910-1C1D-11d0-AE36-8C0F5E000000}\InprocServer32]
(at)="pythoncom25.dll"
"ThreadingModel"="Apartment"

[HKEY_CLASSES_ROOT\CLSID\{DF630910-1C1D-11d0-AE36-8C0F5E000000}\LocalServer32]
(at)="C:\\Python25\\pythonw.exe \"C:\\Python25\\lib\\site-packages\\win32com\\server\\localserver.py\" {DF630910-1C1D-11d0-AE36-8C0F5E000000}"

[HKEY_CLASSES_ROOT\CLSID\{DF630910-1C1D-11d0-AE36-8C0F5E000000}\ProgID]
(at)="Python.AXScript.2"

[HKEY_CLASSES_ROOT\CLSID\{DF630910-1C1D-11d0-AE36-8C0F5E000000}\PythonCOM]
(at)="win32com.axscript.client.pyscript.PyScript"

[HKEY_CLASSES_ROOT\CLSID\{DF630910-1C1D-11d0-AE36-8C0F5E000000}\VersionIndependentProgID]
(at)="Python"

-----Original Message-----
From: owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM] On Behalf Of Andre DeAngelis
Posted At: April 13, 2007 3:09 PM
Posted To: xsi
Conversation: creating lists in Python
Subject: RE: creating lists in Python


Speaking of Python and 6.0, I cannot get Python to show up as a scripting option in XSI.

I have loaded 2.5 and pywin32 and ever ran the pyscript.py and had no luck.

Any ideas?  I am getting desperate.

Andre

-----Original Message-----
From: owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM] On Behalf Of Bernard Lebel
Sent: April 13, 2007 1:13 PM
To: XSI(at)Softimage.COM
Subject: Re: creating lists in Python

> -----Original Message-----
> From: owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM] On 
> Behalf Of Matt Estela

> myList = None * 4860


I don't know if it's a python 2.4 thing, but the approach quoted below doesn't work at all for me. It raise this error:

Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TypeError: unsupported operand type(s) for *: 'NoneType' and 'int'

aList = [ None * 3 ]
does the same thing.


Now, if the intention of the example was something like aList = [ None ] * 3 to give [ None, None, None ], I have to warn to be careful when doing this. I used this approach to create particle arrays, and somehow ran into problems later on. I never use it to create lists. Here is an enlightening email from Patrick Boucher:


Bernard Lebel wrote:
> aArray = [ [] ] * iChannelCount
> # aArray looks like [ [], [], [] ]

This creates a list of three 'pointers' to the _same_ list (kinda / not really but it's the easiest way to decribe it in a few words)

> aArray = [ [], [], [] ]

This creates a list of three distinct, seperate, different lists.

In the first code example you're basically accessing the same list whether you're accessing aArray[0], aArray[1] or aArray[2]

Try the following in a python prompt for a demo:
 >>> a = [[]] * 5
 >>> a
[[], [], [], [], []]
 >>> a[0].append(1)
 >>> a
[[1], [1], [1], [1], [1]]

I don't think you can avoid doing:

aArray = []
for i in range(iChannelCount):
       aArray.append([])
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