Below an illustration of what troubles me a bit.
denis

class Seq(list):
        ''' specialized sequence type with improved str
        Override list's behaviour that list.__str__
        calls __repr__ instead of __str__ on items.
        ???
        '''
        def __str__(self):
                if len(self) == 0:
                        return '[]'
                text = str(self[0])
                for item in self[1:]:
                        text += " ,%s" %item
                return "[%s]" %text

print 1.1, repr(1.1)
print [1.1], Seq([1.1])
==>
1.1 1.1000000000000001
[1.1000000000000001] [1.1]

# By the way, I do not understand at all the behaviour of repr on rounded 
floats:
x = round(1.1,1)
print x, repr(x), "%s" %x
1.1 1.1000000000000001 1.1

???
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