np.size()函数

函数作用：计算当前数组中元素的总个数

函数调用方法：

# method 1
array.size
# method 2
import numpy as np

np.size(array)

示例代码：

import numpy as np


class NumpyStudy:
    @staticmethod
    def mainProgram():
        array = np.array([[1, 2], [3, 4]])
        # method 1
        result1 = np.size(array)
        # method 2
        result2 = array.size
        # method 3
        result3 = np.product(array.shape)
        print('数组array中包含的元素个数为：')
        print(f"The value calculated by method 1: {result1}")
        print(f"The value calculated by method 2: {result2}")
        print(f"The value calculated by method 3: {result3}")


if __name__ == "__main__":
    main = NumpyStudy()
    main.mainProgram()
"""
数组array中包含的元素个数为：
The value calculated by method 1: 4
The value calculated by method 2: 4
The value calculated by method 3: 4
"""

我们可以看到，三种方法均可以获取到ndarray数组中的元素个数。

np.shape()函数

函数作用：计算当前数组的形状

函数调用方法：

# method 1
array.shape
# method 2
import numpy as np

np.shape(array)

示例代码：

import numpy as np


class NumpyStudy:
    @staticmethod
    def mainProgram():
        array = np.array([[1, 2], [3, 4]])
        # method 1
        result1 = np.shape(array)
        # method 2
        result2 = array.shape
        print('数组array的形状为：')
        print(f"The value calculated by method 1: {result1}")
        print(f"The value calculated by method 2: {result2}")


if __name__ == "__main__":
    main = NumpyStudy()
    main.mainProgram()
"""
数组array的形状为：
The value calculated by method 1: (2, 2)
The value calculated by method 2: (2, 2)
"""

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