On 18/11/16 21:00, Bryon Adams wrote:
> Fedora 24. I take four strings and create a list of them. In my below
> code, if I print out prefix and as_path, both give me the same
Because they are the same. They are both references to entries.
> included the output below). What causes this behavior? Is this just how
> Python is handling the variables in memory and I'm actually working on
> 'entries' each time?
Yes, Python variables are just labels attached to objects.
In this case the label 'entries' is applied to a list of lists.
Then you create the labels 'prefix' and 'as_path' and assign
them to the same list object.
> entries = [entry1.split(), entry2.split(), entry3.split(), entry4.split()]
> prefix = entries
> as_path = entries
All 3 names refer to the same underlying object.
> n = 0
> for i in prefix:
> prefix[n] = prefix[n][1]
> n += 1
This would be slightly prettier written as:
for index, item in enumerate(prefix):
prefix[index] = item[1]
--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.amazon.com/author/alan_gauld
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