[英]numpy array to pandas dataframe conversion - ValueError
I have the following numpy array called 'data' - 我有以下名为“数据”的numpy数组-
array([['ksr-usconeng101', 'C', '632.3', '1'],
['ksr-usconeng101', 'D', '242.9', '2'],
['ksr-usconeng158', 'C', '1044.5', '3'],
['ksr-usconeng158', 'D', '2771.2', '4'],
['ksr-usconeng158', 'G', '7.3', '5'],
['ksr-usconeng163', 'C', '1597.0', '6'],
['ksr-usconeng163', 'D', '1676.3', '7'],
['server', 'drive', 'size', '']],
dtype='<U15')
I'm trying to convert it to a dataframe - 我正在尝试将其转换为数据框-
pd.DataFrame(data=data[0:-1,0:3],
index = data[0:-1,-1],
columns = data[-1:, 0:-1])
Data - 数据-
data[0:-1,0:3]
Out[145]:
array([['ksr-usconeng101', 'C', '632.3'],
['ksr-usconeng101', 'D', '242.9'],
['ksr-usconeng158', 'C', '1044.5'],
['ksr-usconeng158', 'D', '2771.2'],
['ksr-usconeng158', 'G', '7.3'],
['ksr-usconeng163', 'C', '1597.0'],
['ksr-usconeng163', 'D', '1676.3']],
dtype='<U15')
Index - 索引-
data[0:-1,-1]
Out[146]:
array(['1', '2', '3', '4', '5', '6', '7'],
dtype='<U15')
Columns - 列 -
data[-1:, 0:-1]
Out[147]:
array([['server', 'drive', 'size']],
dtype='<U15')
However, python doesn't agree and responds with - 但是,python不同意并以-
ValueError: Shape of passed values is (3, 7), indices imply (1, 7)
Please suggest what am I missing .. 请提出我在想什么..
The columns need to be 1D: 列必须是一维的:
df = pd.DataFrame(data=data[:-1,:3],
index=data[:-1,-1],
columns=data[-1, :-1])
print(df)
Output: 输出:
server drive size
1 ksr-usconeng101 C 632.3
2 ksr-usconeng101 D 242.9
3 ksr-usconeng158 C 1044.5
4 ksr-usconeng158 D 2771.2
5 ksr-usconeng158 G 7.3
6 ksr-usconeng163 C 1597.0
7 ksr-usconeng163 D 1676.3
You have: 你有:
>>> data[-1:, 0:-1].shape
(1, 3)
But need: 但需要:
>>> data[-1, :-1].shape
(3,)
Try this 尝试这个
pd.DataFrame(data=data[0:-1,0:3],
index = data[0:-1,-1],
columns = data[-1:, 0:-1].tolist())
import numpy as np, pandas as pd
df = pd.DataFrame(data[0:7, 0:3].flatten().reshape(7,3),
columns = ["a", "b", "c"])
a b c
0 ksr-usconeng101 C 632.3
1 ksr-usconeng101 D 242.9
2 ksr-usconeng158 C 1044.5
3 ksr-usconeng158 D 2771.2
4 ksr-usconeng158 G 7.3
5 ksr-usconeng163 C 1597.0
6 ksr-usconeng163 D 1676.3
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