python - Seaborn.countplot : order categories by count, 也按类别？

Question

所以我了解如何对条形图进行排序(即 here )。但我找不到的是如何按子类别之一对条形图进行排序。

例如，给定以下数据框，我可以获得条形图。但我想做的是，按照 Classic 的 Type 从大到小排序。

import pandas as pd

test_df = pd.DataFrame([
['Jake',    38, 'MW',   'Classic'],
['John',    38,'NW',    'Classic'],
['Sam', 34, 'SE',   'Classic'],
['Sam', 22, 'E' ,'Classic'],
['Joe', 43, 'ESE2', 'Classic'],
['Joe', 34, 'MTN2', 'Classic'],
['Joe', 38, 'MTN2', 'Classic'],
['Scott',   38, 'ESE2', 'Classic'],
['Chris',   34, 'SSE1', 'Classic'],
['Joe', 43, 'S1',   'New'],
['Paul',    34, 'NE2',  'New'],
['Joe', 38, 'MC1',  'New'],
['Joe', 34, 'NE2',  'New'],
['Nick',    38, 'MC1',  'New'],
['Al',  38, 'SSE1', 'New'],
['Al',  34, 'ME',   'New'],
['Al',  34, 'MC1',  'New'],
['Joe', 43, 'S1',   'New']], columns = ['Name','Code_A','Code_B','Type'])


import seaborn as sns
sns.set(style="darkgrid")
palette ={"Classic":"#FF9999","New":"#99CC99"}


g = sns.countplot(y="Name",
                  palette=palette,
                  hue="Type",
                  data=test_df)

所以代替:

“Joe”将位于顶部，然后是“Sam”等。

Answer 1

添加order 参数。使用pandas.crosstab和sort_values来获取:

import pandas as pd

test_df = pd.DataFrame([
['Jake',    38, 'MW',   'Classic'],
['John',    38,'NW',    'Classic'],
['Sam', 34, 'SE',   'Classic'],
['Sam', 22, 'E' ,'Classic'],
['Joe', 43, 'ESE2', 'Classic'],
['Joe', 34, 'MTN2', 'Classic'],
['Joe', 38, 'MTN2', 'Classic'],
['Scott',   38, 'ESE2', 'Classic'],
['Chris',   34, 'SSE1', 'Classic'],
['Joe', 43, 'S1',   'New'],
['Paul',    34, 'NE2',  'New'],
['Joe', 38, 'MC1',  'New'],
['Joe', 34, 'NE2',  'New'],
['Nick',    38, 'MC1',  'New'],
['Al',  38, 'SSE1', 'New'],
['Doug',    34, 'ME',   'New'],
['Fred',    34, 'MC1',  'New'],
['Joe', 43, 'S1',   'New']], columns = ['Name','Code_A','Code_B','Type'])


import seaborn as sns
sns.set(style="darkgrid")
palette ={"Classic":"#FF9999","New":"#99CC99"}

order = pd.crosstab(test_df.Name, test_df.Type).sort_values('Classic', ascending=False).index
g = sns.countplot(y="Name",
                  palette=palette,
                  hue="Type",
                  data=test_df,
                  order=order
                 )