Newbie: changing an attribute of objects in a list
bsimuyandi at africonnect.com
Wed Jun 11 13:09:41 CEST 2003
Hello. I am very new to Python and I'm stuck with a problem. I am using
Zope, and the problem is:
I have a list of objects, each of which has several attributes. I would like
to sort these objects by a specific attribute, which is a string. This I can
manage OK. But if two objects have the same attribute value, I would like to
change the older (age determined by another attribute) object's attribute
to a new value of (old value+1), then go through the list and see if any
other object has this value, if so give it (old value+2) etc.
I hope I have made the problem clear. I know that my code is wrong, but I
would like some hints as to what I am doing wrong. Some of it comes down to
a lack of understanding of Python.
The ordering attribute I'll call "ordering", the age attribute I'll call
"age", and the list of objects is "contents". I thought that the way to do
this was by calling a function recursively. Anyway, below is the code, any
feedback is appreciated.
def check_listingorder(x, contents):
for y in contents:
if x.Id != y.Id: #each object
has a unique id
xorder=int(x.ordering) #convert the string
to an integer
if xorder==yorder: #if the ordering
attribute is the same then...
if x.age> y.age: #if x is
older than y then...
<set object ordering value to xorder>
#call function again?
elif y.age> x.age: #if y is
older than x then...
<set object ordering value to yorder>
check_listingorder(y, contents) #call
return contents #return the
for x in contents: #originally
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