Why change the default? Global state is always a liability; Just don't do
it. Make the field a parameter to your code:
def frobnicate(x,y, field=None)
if field is None:
from sage.structure.element import get_coercion_model
field = get_coercion_model().common_parent(x, y)
x, y = field(x), field(y)
...
frobnicate(1, 2, field=RealField(100))
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