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Functions are not automatically imported, so you need to add

TESTS::

    sage: from sage.combinat.combinat import euler_polynomial
    sage: y = QQ['y'].gen()
    ...

Functions are not automatically imported, so you need to addadd a line to the doctest:

TESTS::

    sage: from sage.combinat.combinat import euler_polynomial
    sage: y = QQ['y'].gen()
    ...