[Tutor] list output -- float output

[spir]

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

???