In [1]:
pip install numpy
Requirement already satisfied: numpy in c:\users\dengzl\.conda\envs\data_analysis\lib\site-packages (1.26.0) Note: you may need to restart the kernel to use updated packages.
In [2]:
# 创建一个一维数组
import numpy as np
d1 = np.array([1,2,3,4,5])
d1
Out[2]:
array([1, 2, 3, 4, 5])
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# 属性: size数据大小
d1.size
Out[3]:
5
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# 属性：type数据类型
type(d1)
Out[7]:
numpy.ndarray
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# ndim数据维度
d1.ndim
Out[8]:
1
In [11]:
# 创建二位数组
d2 = np.arange(15)
d2
Out[11]:
array([ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14])
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# 增加行、列维度
d2 = d2.reshape(3,5)
d2
Out[14]:
array([[ 0, 1, 2, 3, 4],
[ 5, 6, 7, 8, 9],
[10, 11, 12, 13, 14]])
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# 打印属性
d2.size
Out[15]:
15
In [16]:
d2.ndim
Out[16]:
2
In [17]:
type(d2)
Out[17]:
numpy.ndarray
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