您可以使用np.errstate上下文管理器忽略警告，然后将nans替换为所需的内容：
import numpy as np
angle = np.arange(-5., 5.)
norm = np.arange(10.)
with np.errstate(divide='ignore'):
print np.where(norm != 0., angle / norm, -2)
# or:
with np.errstate(divide='ignore'):
res = angle/norm
res[np.isnan(res)] = -2
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