[Python] Meaning of comma during assignment of function return value

I understood simple concepts about comma operator in Python. For instance,

x0, sigma = 0, 0.1


means x0 = 0 and sigma = 0.1. But I obtained some code that has a line that looks like the following,

y, xe = np.histogram(np.random.normal(x0, sigma, 1000))


where the output of y and xe are the following:

y
Out[10]: array([ 3, 17, 58, 136, 216, 258, 189, 87, 31, 5], dtype=int64)

xe
Out[11]:
array([-0.33771565, -0.27400243, -0.21028922, -0.146576 , -0.08286279,
-0.01914957, 0.04456364, 0.10827686, 0.17199007, 0.23570329,
0.2994165 ])


I am not sure how to read the y, xe expression. What could I look up to understand what it's saying?

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