Python中list和ndarray的区别

import numpy as np


num = [3, 4, 3]
print(type(num))  # 
num2 = num * 2
print(num2)  # [3, 4, 3, 3, 4, 3]

arr = np.array(num)
print(type(arr))   # 
arr2 = arr * 2
print(arr2)  # [6 8 6]

tup = tuple(num)
print(type(tup))  # 
tup2 = tup * 2
print(tup2)  # (3, 4, 3, 3, 4, 3)

se = set(num)
print(type(se))  # 
print(se)  # {3, 4}