import numpy as np
x = np.empty(shape=[0, 2])
a = np.array((1,2))
for i in range(10):
x = np.append(x, [a], axis = 0)
print(x)
import numpy as np
x = np.empty(shape=[0, 2])
a = np.array((1,2))
for i in range(10):
x = np.append(x, [a], axis = 0)
print(x)