Python 两个list相加相减 列表运算

a = [1,2,3]

b = [4,5,6]

a+b
Out[11]: [1, 2, 3, 4, 5, 6]

a/b
Traceback (most recent call last):

  File "", line 1, in
    a/b

TypeError: unsupported operand type(s) for /: 'list' and 'list'

 

问题在于：两个list不能直接算数运算

解决方案：转成np运算  ↓

aa = np.array(a)

bb = np.array(b)

aa,bb
Out[15]: (array([1, 2, 3]), array([4, 5, 6]))

然后运算看看：

aa+bb
Out[16]: array([5, 7, 9])

aa/bb
Out[17]: array([0.25, 0.4 , 0.5 ])