python中如何计算矩阵的行数？

import numpy as np

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

# 输出数组的行和列数

print(x.shape) # (4, 3)

# 只输出行数

print(x.shape[0]) # 4

# 只输出列数

print (x.shape[1]) # 3

import numpy as np

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

# 输出数组的行数

print(len(x)) #4