def to_sympy(self, a):
        return a.as_expr()
Thread should pin when method is POST.
dataset/ETHPy150Open sympy/sympy/sympy/polys/domains/fractionfield.py/FractionField.to_sympy--crossover with--dataset/ETHPy150Open jbalogh/django-multidb-router/multidb/tests.py/MiddlewareTests.test_pin_on_post