A correction to my corrections inline below!
On 10/23/10 9:56 PM, Jason Grout wrote:
A few little corrections or explanations inline below...
On 10/23/10 8:34 AM, Francois Maltey wrote:
Rolandb wrote :
test=((k2,k1) for k1 in xrange(2,4) for k2 in xrange(1,k1) if
gcd(k1,k2)==1)
print [t for t in test]
print [t for t in test]
[(1, 2), (1, 3), (2, 3)]
[]
I begun to confuse lists L with [...] we can free change :
one change one term by L[1]=123, and change the length by
L[3:4]=[7,6,8], or del, or L.pop(), ...
And tuple with (...) as T=(12,13,14,15) it's impossible to change.
A void tuple or a void list are [] and ()
Actually, the empty tuple is (,)---you mention why in this next sentence:
You were right and I was wrong!
sage: type(())
<type 'tuple'>
sage: (,)
------------------------------------------------------------
File "<ipython console>", line 1
(,)
^
SyntaxError: invalid syntax
Thanks for teaching me something new.
Jason
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