根据 Pandas 中列满足的条件删除一组列

Question

I have a dataframe whereby the column names are tuples. Below is a sample data for my dataframe:

data = {"('7086', 'Open')": {5: 0.0700000002980232, 6: 0.0649999976158142, 7: 0.0750000029802322, 8: 0.0649999976158142, 9: 0.0700000002980232},
 "('7086', 'High')": {5: 0.0700000002980232, 6: 0.0750000029802322, 7: 0.0750000029802322, 8: 0.0750000029802322, 9: 0.0700000002980232},
 "('7086', 'Low')": {5: 0.0700000002980232, 6: 0.0649999976158142, 7: 0.0750000029802322, 8: 0.0649999976158142, 9: 0.0700000002980232},
 "('7086', 'Close')": {5: 0.0700000002980232, 6: 0.0750000029802322, 7: 0.0750000029802322, 8: 0.0750000029802322, 9: 0.0700000002980232},
 "('7086', 'Adj Close')": {5: 0.0700000002980232, 6: 0.0750000029802322, 7: 0.0750000029802322, 8: 0.0750000029802322, 9: 0.0700000002980232},
 "('7086', 'Volume')": {5: 0, 6: 3200, 7: 0, 8: 200800, 9: 260000},
 "('03028', 'Open')": {5: 0.3600000143051147, 6: 0.3600000143051147, 7: 0.3600000143051147, 8: 0.3600000143051147, 9: 0.3600000143051147},
 "('03028', 'High')": {5: 0.3600000143051147, 6: 0.3600000143051147, 7: 0.3600000143051147, 8: 0.3600000143051147, 9: 0.3600000143051147},
 "('03028', 'Low')": {5: 0.3600000143051147, 6: 0.3600000143051147, 7: 0.3600000143051147, 8: 0.3600000143051147, 9: 0.3600000143051147},
 "('03028', 'Close')": {5: 0.3600000143051147, 6: 0.3600000143051147, 7: 0.3600000143051147, 8: 0.3600000143051147, 9: 0.3600000143051147},
 "('03028', 'Adj Close')": {5: 0.3509772419929504, 6: 0.3509772419929504, 7: 0.3509772419929504, 8: 0.3509772419929504, 9: 0.3509772419929504},
 "('03028', 'Volume')": {5: 15500.0, 6: 0.0, 7: 0.0, 8: 0.0, 9: 0.0}}

df = pd.DataFrame(data)

   ('7086', 'Open')  ...  ('03028', 'Volume')
5             0.070  ...              15500.0
6             0.065  ...                  0.0
7             0.075  ...                  0.0
8             0.065  ...                  0.0
9             0.070  ...                  0.0

[5 rows x 12 columns]

Now, what I hope to perform is to remove the group of columns with the same number code when one of the columns in the number code has only 1 unique number:

df.nunique()

('7086', 'Open')          3
('7086', 'High')          2
('7086', 'Low')           3
('7086', 'Close')         2
('7086', 'Adj Close')     2
('7086', 'Volume')        4
('03028', 'Open')         1
('03028', 'High')         1
('03028', 'Low')          1
('03028', 'Close')        1
('03028', 'Adj Close')    1
('03028', 'Volume')       2
dtype: int64

As above, we can see in the number code 03028 , that 5 out of 6 columns have only 1 unique value. Therefore, I wish to remove all the 6 columns with the same number code based on this fact. Is there any idea I can do that? I was thinking of grouping it together and dropping it. But I'm not sure how to deal with the tuples. Thanks in advance.

My expected output will be:

   ('7086', 'Open')  ...  ('7086', 'Volume')
5             0.070  ...                   0
6             0.065  ...                3200
7             0.075  ...                   0
8             0.065  ...              200800
9             0.070  ...              260000

[5 rows x 6 columns]

Answer 1

You can do

out = df.loc[:,~df.columns.str.contains("'03028',")]

If multiple

out = df.loc[:,~df.columns.str.contains("'03028',|'00000',")]

Answer 2

Try something like this

import ast

df.columns = pd.MultiIndex.from_tuples(map(ast.literal_eval, df.columns))

filter_ = (df.nunique()==1).groupby(level=0).any()
df.drop(filter_[filter_].index, axis=1, level=0)