import sympy
from sympy import cos, sin, sinh
from einsteinpy.symbolic import MetricTensor, RicciTensor, RicciScalar
sympy.init_printing()
syms = sympy.symbols("t chi theta phi")
t, ch, th, ph = syms
m = sympy.diag(-1, cos(t) ** 2, cos(t) ** 2 * sinh(ch) ** 2, cos(t) ** 2 * sinh(ch) ** 2 * sin(th) ** 2).tolist()
metric = MetricTensor(m, syms)
Ric = RicciTensor.from_metric(metric)
Ric.tensor()
R = RicciScalar.from_riccitensor(Ric)
R.expr
The curavture is -12 which is in-line with the theoretical results