[Baypiggies] Discussion for newbies/beginner night talks
DennisR at dair.com
Sat Feb 10 00:40:00 CET 2007
>2) If you need to do a lot of string appends, use lists and join().
This is an optimization and as such may not be the first approach to
consider. All of the code samples I showed used string appends such as
str = ""
str += "string 1"
str + "string 2"
Why? ... because it is more concise and renders the code easier to
read. I think in 4 or so years, I have had to convert an append string
such as this into appending list elements followed by a join once, maybe
Your experience may differ but there is a clarity vs. efficiency tradeoff
here and my experience is that the efficiency is rarely needed.
I realize Chad said "a lot". That is a key qualifier. When doing "a lot",
>3) Understand and use iterators in loops.
I am using 2.3 and get by without iterators. I would re-purpose this
Coming from other languages, the natural tendency is to iterate over a
structure by index:
for i in range(0,99):
element = array[i]
The range operator is considered evil in that it builds a list at
runtime. So, taken literally, the advice could be construed to use an
My advice is to not do either of the above. Instead, iterate over the
structure and let the array element be the loop iteration value. Instead
of iterators, do:
for element in array:
and dispense with indicies to the extent that you can. There will be cases
where you need an index (e.g. updating element) but the first approach
ought to be iterating over the structure.
>5) Understand and use the decorate/sort/undecorate (DSU) idiom.
I don't even know what that is. When is the tutorial...?
| Dennis | DennisR at dair.com |
| Reinhardt | http://www.dair.com |
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