# SageMath code for working with modular form 7488.2.a.cf


# Compute space of new eigenforms: 
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(7488, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0, 0, 0]))
N = Newforms(chi, 2, names="a")

# select newform: 
traces = [2,0,0,0,-3,0,3,0,0,0,4,0,2,0,0,0,-3,0,-12,0,0,0,0,0,3,0,0,0,
0]
f = next(g for g in N if [g.coefficient(i+1).trace() for i in range(29)] == traces)

# q-expansion: 
f.q_expansion() # note that sage often uses an isomorphic number field