numpy.isreal(array)：逐一测试是否为实数(不是无穷大还是不是数字)，然后将结果作为布尔数组返回。
参数：
array:[array_like] Input array whose element we want to test
返回：
boolean array containing the result
代码1：
# Python Program illustrating
# numpy.isreal() method
import numpy as geek
print("Is Real:", geek.isreal([1+1j, 0j]), "\n")
print("Is Real:", geek.isreal([1, 0]), "\n")输出：
Is Real: [False True] Is Real: [ True True]
代码2：
# Python Program illustrating
# numpy.isreal() method
import numpy as geek
# Returns True/False value for each element
a = geek.arange(20).reshape(5, 4)
print("Is Real:\n", geek.isreal(a), "\n")
# Returns True/False value as ans
# because we have mentioned dtpe in the beginning
a = geek.arange(20).reshape(5, 4).dtype = float
print("\nIs Real:", geek.isreal(a))输出：
Is Real: [[ True True True True] [ True True True True] [ True True True True] [ True True True True] [ True True True True]] Is Real: True
参考文献：
https://docs.scipy.org/doc/numpy-dev/reference/generated/numpy.isreal.html#numpy.isreal
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