定製與熊貓

Question

排序我有以下的數據幀，我想首先由臨界然後排序名稱：

Name  Criticality 
baz   High 
foo   Critical 
baz   Low 
foo   Medium 
bar   High 
bar   Low 
bar   Medium 
... 

我一直在嘗試這種使用this post提供的答案，但我只是做不能讓它工作。

最終的結果應該是這樣的

Name  Criticality 
bar   High 
bar   Medium 
bar   Low 
baz   High 
baz   Low 
foo   Critical 
foo   Medium 

Answer 1

一個方法是使用自定義字典來創建一個「等級」欄，然後我們用它來進行排序與​​再分類後除去列：

In [17]: 
custom_dict = {'Critical':0, 'High':1, 'Medium':2, 'Low':3} 
df['rank'] = df['Criticality'].map(custom_dict) 
df 

Out[17]: 

    Name Criticality rank 
0 baz  High  1 
1 foo Critical  0 
2 baz   Low  3 
3 foo  Medium  2 
4 bar  High  1 
5 bar   Low  3 
6 bar  Medium  2 

[7 rows x 3 columns] 

In [19]: 
# now sort by 'Name' and 'rank', it will first sort by 'Name' column first and then 'rank' 
df.sort(columns=['Name', 'rank'],inplace=True) 
df 

Out[19]: 

    Name Criticality rank 
4 bar  High  1 
6 bar  Medium  2 
5 bar   Low  3 
0 baz  High  1 
2 baz   Low  3 
1 foo Critical  0 
3 foo  Medium  2 

[7 rows x 3 columns] 

In [21]: 
# now drop the 'rank' column 
df.drop(labels=['rank'],axis=1) 

Out[21]: 

    Name Criticality 
4 bar  High 
6 bar  Medium 
5 bar   Low 
0 baz  High 
2 baz   Low 
1 foo Critical 
3 foo  Medium 

[7 rows x 2 columns]