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Consider the following:

R.<a> = InfinitePolynomialRing(QQ)
p = a[1]*a[2]^2

Then we have

sage: p.degree(a[1].variable())
1
sage: p.degree(a[2].variable())
2

but

sage: p.degree(a[3].variable())
...
TypeError: argument is not coercible to the parent

instead of returning 0. Moreover, if I execute one of the commands that worked before again, for example p.degree(a[1].variable()), it yields the same error.

Consider the following:

sage: R.<a> = InfinitePolynomialRing(QQ)
p = a[1]*a[2]^2
sage: p=a[1]*a[2]^2

Then we have

sage: p.degree(a[1].variable())
1
sage: p.degree(a[2].variable())
2

but

sage: p.degree(a[3].variable())
...
TypeError: argument is not coercible to the parent

instead of returning 0. Moreover, if I execute one of the commands that worked before again, for example p.degree(a[1].variable()), it yields the same error.

Consider the following:

sage: R.<a> = InfinitePolynomialRing(QQ)
sage: p=a[1]*a[2]^2
p = a[1]*a[2]^2

Then we have

sage: p.degree(a[1].variable())
1
sage: p.degree(a[2].variable())
2

but

sage: p.degree(a[3].variable())
...
TypeError: argument is not coercible to the parent

instead of returning 0. Moreover, if I execute one of the commands that worked before again, for example p.degree(a[1].variable()), it yields the same error.

Consider the following:

sage: R.<a> = InfinitePolynomialRing(QQ)
sage: p = a[1]*a[2]^2

Then we have

sage: p.degree(a[1].variable())
1
sage: p.degree(a[2].variable())
2

but

sage: p.degree(a[3].variable())
...
TypeError: argument is not coercible to the parent

instead of returning 0. Moreover, if I execute one of the commands that worked before again, for example p.degree(a[1].variable()), it yields the same error.error. How can I solve this?

Consider the following:

sage: R.<a> = InfinitePolynomialRing(QQ)
sage: p = a[1]*a[2]^2

Then we have

sage: p.degree(a[1].variable())
1
sage: p.degree(a[2].variable())
2

but

sage: p.degree(a[3].variable())
...
TypeError: argument is not coercible to the parent

instead of returning 0. Moreover, if I execute one of the commands that worked before again, for example p.degree(a[1].variable()), it yields the same error. How can I solve this?