jupyter的使用

import numpy as np

# 用列表创建一维数组
arr1 = np.array([1,2,3,4])

arr1

array([1, 2, 3, 4])

s=['a','b','c']
np.array(s)

array(['a', 'b', 'c'], dtype='

# 用元祖创建一维数组

s2=('a','b','c')
np.array(s2)

array(['a', 'b', 'c'], dtype='

# 用列表创建二维数组
s3=[[1,2,3],[2,3,4]]
np.array(s3)

array([[1, 2, 3],
       [2, 3, 4]])

arr5 = np.array(range(100))

print(arr5)
print(arr6)

[ 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71
 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95
 96 97 98 99]



---------------------------------------------------------------------------

NameError                                 Traceback (most recent call last)

 in 
      2 
      3 print(arr5)
----> 4 print(arr6)


NameError: name 'arr6' is not defined

print(arr5.shape)

(100,)

# 观察数组的轴
print(arr5.ndim)

1