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TypeError: 'sage.rings.integer.Integer' object is not iterable

asked 2018-03-21 06:30:36 -0500

anonymous user

Anonymous

This is my code

m=[1,2,3,4]
c=[[1,3],[2,3],[1,2],[3,4]]

for i in Subsets(m):
    print(i)
    alpha_ij=0
    for j in c:
        delta_ij=set(i).symmetric_difference(set(j))
        print(delta_ij)

        for i in delta_ij:
            alpha_ij=alpha_ij+2^i
    print(alpha_ij)

When I compile it I get

{}
set([1, 3])
Traceback (most recent call last):        for j in c:
  File "", line 1, in <module>

  File "/tmp/tmpgaYE70/___code___.py", line 10, in <module>
    delta_ij=set(i).symmetric_difference(set(j))
TypeError: 'sage.rings.integer.Integer' object is not iterable

Which I do not understand because I do not think that I have iterated over any integer in any part of the code. The problem seem to be the last three lines because if delete them and compile the code there does not appear any error.

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answered 2018-03-21 07:11:51 -0500

Change the variable in your third loop from i to, say, k. The variable i is supposed to be a subset of m.

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Comments

Thank you, it works. Somehow I thought that I can treat the variable i in the third loop more or less like a bound variable in the predicate logic.

kristi gravatar imagekristi ( 2018-03-21 09:15:23 -0500 )edit

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Asked: 2018-03-21 06:30:36 -0500

Seen: 50 times

Last updated: Mar 21