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The issue is that the range function outputs numbers of the type Python int rather than Sage Integer. You could use Sage's srange function instead:

for i in range(2):
    print(type(i))

will produce

<class 'int'>
<class 'int'>

whereas

for i in srange(2):
    print(type(i))

will give

<class 'sage.rings.integer.Integer'>
<class 'sage.rings.integer.Integer'>

The issue is that the range function outputs numbers of the type Python int rather than Sage Integer. , and digits is only defined for the latter. You could use Sage's srange function instead:

for i in range(2):
    print(type(i))

will produce

<class 'int'>
<class 'int'>

whereas

for i in srange(2):
    print(type(i))

will give

<class 'sage.rings.integer.Integer'>
<class 'sage.rings.integer.Integer'>