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Hello,

First of all, your code works! The problem is that you need to specify a value to the variables a and b. The best way should be to put all that in a function as in the following

def euclide(a,b):
    r=a%b
    print (a,b,r)
    while r != 0:
        a=b; b=r
        r=a%b
        print (a,b,r)

Then you can do

sage: eudlide(12,5)
(12, 5, 2)
(5, 2, 1)
(2, 1, 0)

To use an external file, it depends on how do you use Sage : in a console or with the notebook ?

Vincent

Hello,

First of all, your code works! The problem is that you need to specify a value to the variables a and b. The best way should be to put all that in a function as in the following

def euclide(a,b):
    r=a%b
    print (a,b,r)
    while r != 0:
        a=b; b=r
        r=a%b
        print (a,b,r)

Then you can do

sage: eudlide(12,5)
euclide(12,5)
(12, 5, 2)
(5, 2, 1)
(2, 1, 0)

To use an external file, it depends on how do you use Sage : in a console or with the notebook ?

Vincent