Alex Martelli aleax at mail.comcast.net
Thu Nov 3 00:26:37 EST 2005

• Previous message (by thread): Python for .NET and IronPython
• Next message (by thread): Nested List Question
• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

---

Newsfeeds <chris.mccoy at spirentcom.com> wrote:

> Hello All,
> 
>   Could anyone tell me why this code produces the output it does?
   ...
> gridSystemId = [[None]*columns]*rows

You've made gridSystemID a list of `rows` references to the SAME "inner"
list, so the behavior you observe is the only possible one.

If you want copies instead, ASK for copies...:

gridSystemId = [ [None]*columns for x in xrange(rows) ]


Alex

---

• Previous message (by thread): Python for .NET and IronPython
• Next message (by thread): Nested List Question
• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

---

More information about the Python-list mailing list