WP wrote:
Solved the problem, see below...
Hello, here are some new things I've problems with. I've made a program
that opens and reads a text file. Each line in the file contains a name
and a score. I'm assuming the file has the correct format. Each
name-score pair is used to instantiate a class Score I've written. This
works fine, but here's my problem: After reading the file I have list of
Score objects. Now I want to sort them in descending order. But no
matter how I write my __cmp__ the order remains unchanged. I've
determined that __cmp__ is called but it's only called twice for three
list elements, isn't that odd?
Complete program:
class Score:
def __init__(self, name_, score_):
self.name = name_
self.score = score_
def __str__(self):
return "Name = %s, score = %d" % (self.name, self.score)
def __cmp__(self, other):
print "in __cmp__"
return self.score >= other.score
name = ""
score = 0
# End class Score
filename = "../foo.txt";
try:
infile = open(filename, "r")
except IOError, (errno, strerror):
print "IOError caught when attempting to open file %s. errno = %d,
strerror = %s" % (filename, errno, strerror)
exit(1)
lines = infile.readlines()
infile.close()
lines = [l.strip() for l in lines] # Strip away trailing newlines.
scores = []
for a_line in lines:
splitstuff = a_line.split()
scores.append(Score(splitstuff[0], int(splitstuff[1])))
scores.sort()
for a_score in scores:
print a_score
Test file contents:
Michael 11
Hanna 1337
Lena 99
Output:
in __cmp__
in __cmp__
Name = Michael, score = 11
Name = Hanna, score = 1337
Name = Lena, score = 99
What am I doing wrong here?
- Eric (WP)
I solved it, I rewrote __cmp__ to:
def __cmp__(self, other):
if self.score == other.score:
return cmp(self.name, other.name)
else:
return cmp(other.score, self.score)
This sorts so that score goes from highest to lowest. If two person have
the same score, I sort on names in alphabetical order. The following
text file:
Michael 11
Hanna 1337
Lena 99
Anna 99
yields (just as I want):
Name = Hanna, score = 1337
Name = Anna, score = 99
Name = Lena, score = 99
Name = Michael, score = 11
- Eric (WP)
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