Planck18.py

from astropy.cosmology import FlatLambdaCDM
import astropy.units as u

planck18_cosmology = {'Oc0': 0.2607,
                      'Ob0': 0.04897,
                      'Om0': 0.3111,
                      'H0': 67.66,
                      'n': 0.9665,
                      'sigma8': 0.8102,
                      'tau': 0.0561,
                      'z_reion': 7.82,
                      't0': 13.787,
                      'Tcmb0': 2.7255,
                      'Neff': 3.046,
                      'm_nu': [0., 0., 0.06],
                      'z_recomb': 1089.80,
                      'reference': "Planck 2018 results. VI. Cosmological Parameters, "
                                   "A&A, submitted, Table 2 (TT, TE, EE + lowE + lensing + BAO)"
                      }

Planck18 = FlatLambdaCDM(H0=planck18_cosmology['H0'],
                         Om0=planck18_cosmology['Om0'],
                         Tcmb0=planck18_cosmology['Tcmb0'],
                         Neff=planck18_cosmology['Neff'],
                         Ob0=planck18_cosmology['Ob0'], name="Planck18",
                         m_nu=u.Quantity(planck18_cosmology['m_nu'], u.eV))