记录在项目中遇到的一些问题。
import numpy as np a = np.array((0.2,0.5,0.9,1.5))
对a进行转置：
import numpy as np a = np.array((0.2,0.5,0.9,1.5)) a_new = a.reshape(1,4)1、array转DataFrame
import numpy as np import pandas as pd a = np.array((0.2,0.5,0.9,1.5)) a_new = a.reshape(1,4) df_a = pd.DataFrame(a_new)
修改列名：
import numpy as np import pandas as pd a = np.array((0.2,0.5,0.9,1.5)) a_new = a.reshape(1,4) df_a = pd.DataFrame(a_new) df_a.columns = ['a', 'b', 'c', 'd'] # 列名2、DataFrame转json
import numpy as np import pandas as pd a = np.array((0.2,0.5,0.9,1.5)) a_new = a.reshape(1,4) df_a = pd.DataFrame(a_new) df_a.columns = ['a', 'b', 'c', 'd'] # 列名 # DataFrame转jason df_a_new = df_a.to_json(orient="columns")3、DataFrame修改列的顺序
在df_a中列的顺序是a、b、c、d
现在需要的顺序是d、b、c、a
import numpy as np import pandas as pd a = np.array((0.2,0.5,0.9,1.5)) a_new = a.reshape(1,4) df_a = pd.DataFrame(a_new) df_a.columns = ['a', 'b', 'c', 'd'] # 列名 df_a_p = df_a[["d","b","c","a"]]
附，赠送一个
拼接DataFrame，A,B,C, D四个DataFrame
ABCD = pd.concat([A,B,C, D], axis=1)
参考：
https://blog.csdn.net/qq_27328197/article/details/113823989
