1 import pandas as pd
 2 
 3 # 加载数据
 4 detail = pd.read_excel("./meal_order_detail.xlsx")
 5 print("detail: \n", detail)
 6 print("detail的列名称: \n", detail.columns)
 7 
 8 # 1、删除法
 9 # 先进性判断,哪些列都是空的
10 drop_list = []
11 for column in detail.columns:
12     print(column)
13     # 统计每一列非空数据的数量
14     res = detail.loc[:, column].count()
15     print("res: \n", res)
16     if res == 0:
17         drop_list.append(column)
18 
19 print(drop_list)
20 
21 # 再进行删除:
22 detail.drop(labels=drop_list, axis=1, inplace=True)
23 print("删除全部为空列之后的结果: \n" ,detail.shape)
24 
25 # 2、保留法
26 # 先进性判断,哪些列不全为空
27 save_list = []
28 for column in detail.columns:
29     print("detail.columns: \n", detail.columns)
30     print("columns: \n", column)
31     # 统计每一列非空数据的数量
32     res = detail.loc[:, column].count()
33     # print("res: \n", res)
34     if res != 0:
35         save_list.append(column)
36 
37 print(save_list)
38 
39 # 将不全为空的列的数据重新赋值给detail
40 detail = detail.loc[:, save_list]
41 
42 print("datail: \n", detail)
43 print("保留全部为空列之后的结果: \n", detail.shape)