np里一个数出现的次数python代码

要统计NumPy数组中某个数出现的次数，可以使用以下两种方法：

方法一：使用NumPy的函数bincount()

import numpy as np

arr = np.array(\[0, 0, 1, 1, 1, 3, 4, 5, 6, 5, 4, 3, 4, 2, 23\])
x = 1

count = np.bincount(arr)
x_count = count\[x\]

print(x_count)

结果：3

方法二：使用Python的循环

import numpy as np

arr = np.array(\[0, 0, 1, 1, 1, 3, 4, 5, 6, 5, 4, 3, 4, 2, 23\])
x = 1

count = 0
for num in arr:
    if num == x:
        count += 1

print(count)

结果：3

以上两种方法都可以用来统计NumPy数组中某个数出现的次数。
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