Question: Multiple integrals with python don't work

The environment is python 3.7.6, windows10.

The multiple integral integrate.nquad doesn't seem to work well and the result should be 1.000 (because it's a simultaneous probability density function), but it returns 1.326. How can I get multiple integrals correctly? code import numpy as np from scipy import integrate

def f_xy(x, y): 　　　if 0 <= y <= 1 and 0 <= x-y <= 1: 　　　　　　return 4 * y * (x - y) 　　　else: 　　　　　　return 0

integrate.nquad(f_xy, [[-np.inf, np.inf],[-np.inf, np.inf]])[0]

Out:　1.326

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