from scipy.stats import chi2_contingency as chi2
import numpy as np

obs = np.array([[203.0, 49.0], [279.0, 78.0]])
chi,p,dof,expected = chi2(obs)
print("%f, %e, %f" % (chi, p, dof))

'''
classic
chi = 0.381964, p = 0.536554

survive
chi = 23.490576, p = 1.255272e-06
'''