Re: Splitting a string into substrings of equal size

[Rascal]

I'm bored for posting this, but here it is:

def add_commas(str):
str_list = list(str)
str_len = len(str)
for i in range(3, str_len, 3):
str_list.insert(str_len - i, ',')
return ''.join(str_list)

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Re: Python 'for' loop is memory inefficient

[Rascal]

look at xrange -- http://docs.python.org/library/functions.html#xrange
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Re: Problem with join in__str__() in class (newbie)

[jon rascal]

 def __str__(self):
      output = '%s:%s' % (self.expert_id, self.name)
      output += '\nKnown topics: %s' % (', '.join(str(self.topics)))

You're turning your list into a string -- try this:
', '.join([str(x) for x in self.topics])
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