simple newbie question

[Chad Netzer]

On Tuesday 10 December 2002 18:18, eugene kim wrote:
> what's different in these two..assignment, append?
>
> listvar1 = [1]
> listvar2 = listvar1
> listvar2 = [2]

This is equivalent to:
listvar1 = [1]
listvar2 = [2]


> listvar1 = [1]
> listvar2 = listvar1
> listvar2.append(2)

This is equivalent to:
listvar1 = [1]
listvar1.append(2)
listvar2 = listvar1

Lists don't get copied when you assign them with '=', nor do they 
append.  They simply get a new name (in addition to any other names 
for the list)

-- 
Bay Area Python Interest Group - http://www.baypiggies.net/

Chad Netzer
cnetzer at mail.arc.nasa.gov