可能的解决方案：

(pd.DataFrame(nested_dict).stack().swaplevel().reset_index()
 .set_axis(['Class', 'Type', 'Counter'], axis=1)
 .sort_values(['Class', 'Type']))

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输出量：

Class      Type  Counter
0    Type A    Type A     10.0
3    Type A    Type B     20.0
1   Type EE    Type A     60.0
4   Type EE    Type B     40.0
5   Type EE    Type C     50.0
2  Type FFF    Type A     90.0
8  Type FFF   Type AA      1.0
7  Type FFF  Type FFF     80.0
6  Type FFF   Type ZZ     70.0

型

import pandas as pd

nested_list=[]
for cl, predictions in nested_dict.items():
    for type_cat, counter in predictions.items():
        nested_list.append((cl, type_cat, counter))

df = pd.DataFrame(nested_list, columns=['CLASS', 'TYPE', 'COUNTER'])

df=df.sort_values(by='CLASS')

print(df)

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输出：

CLASS      TYPE  COUNTER
0    Type A    Type A       10
1    Type A    Type B       20
2   Type EE    Type B       40
3   Type EE    Type C       50
4   Type EE    Type A       60
5  Type FFF   Type ZZ       70
6  Type FFF  Type FFF       80
7  Type FFF    Type A       90
8  Type FFF   Type AA        1

型

import pandas as pd
from tabulate import tabulate

# Given nested dictionary
nested_dict = {
    'Type A':   {'Type A':  10, 'Type B': 20},
    'Type EE':  {'Type B':  40, 'Type C': 50, 'Type A': 60},
    'Type FFF': {'Type ZZ': 70, 'Type FFF': 80, 'Type A': 90, 'Type AA': 1}
}

# Convert the nested dictionary into a flat list of tuples
data = []
for key, values in nested_dict.items():
    for sub_key, sub_value in values.items():
        data.append((key, sub_key, sub_value))

# Create the pandas DataFrame from the flat list of tuples
df = pd.DataFrame(data, columns=['class', 'TYPE', 'COUTER'])

# If you want to sort the DataFrame by the 'class' column
df = df.sort_values(by='class').reset_index(drop=True)

# Convert DataFrame to tabulate format and print with vertical lines using the 'pipe' table format
table = tabulate(df, headers='keys', tablefmt='pipe',
                 showindex=False, numalign="center", stralign="center")

# Print the tabulated DataFrame
print(table)

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这是输出？

|  class   |   TYPE   |  COUTER  |
|:--------:|:--------:|:--------:|
|  Type A  |  Type A  |    10    |
|  Type A  |  Type B  |    20    |
| Type EE  |  Type B  |    40    |
| Type EE  |  Type C  |    50    |
| Type EE  |  Type A  |    60    |
| Type FFF | Type ZZ  |    70    |
| Type FFF | Type FFF |    80    |
| Type FFF |  Type A  |    90    |
| Type FFF | Type AA  |    1     |

型