问如何从文本文件创建嵌套字典

EN

from collections import defaultdict

icd9_encyclopedia = defaultdict(dict)
disease_group = ""
with open("icd9_info.txt", 'r') as f:
    for line in [i[:-1] for i in f.readlines()]: # [:-1] to remove '\n' for each line
        if line == "": # skip if blank line
            continue
        if not line[0].isdigit():
            disease_group = line # temporarily save current disease group name for the following lines
        else:
            code, name = line.split(maxsplit=1)
            icd9_encyclopedia[disease_group][code] = name

for key, value in icd9_encyclopedia.items():
    print(key, value)
    
#Intestinal infectious diseases (001-003) {'001': 'Cholera', '002': 'Typhoid and paratyphoid fevers', '003': 'Other salmonella infections'}
#Tuberculosis (004-006) {'004': 'Primary tuberculous infection', '005': 'Pulmonary tuberculosis', '006': 'Other respiratory tuberculosis'}

from pprint import pprint

icd9_encyclopedia={}

key = None
item = {}

with open("icd9_info.txt") as f:
    for line in f:
        line = line.strip()
        if not line[0].isdigit():
            # Start a new item
            if key:
                # Store the prior item in the main dictionary
                icd9_encyclopedia[key] = item
            # Initialize the new item
            key = line
            item = {}
        else:
            # A detail entry - add it to the current item
            num, rest = line.split(' ', 1)
            item[num] = rest

# Store the final item to the dictionary
if key:
    icd9_encyclopedia[key] = item

pprint(icd9_encyclopedia)

{'Intestinal infectious diseases (001-003)': {'001': 'Cholera',
                                              '002': 'Typhoid and paratyphoid '
                                                     'fevers',
                                              '003': 'Other salmonella '
                                                     'infections'},
 'Tuberculosis (004-006)': {'004': 'Primary tuberculous infection',
                            '005': 'Pulmonary tuberculosis',
                            '006': 'Other respiratory tuberculosis'}}

import itertools
from pathlib import Path

# load text lines
lines = Path('data.txt').read_text().split('\n')

# build output dictionary
icd9_encyclopedia = {
    # build single group dictionary
    group_name: {
        int(code): disease_name
        # split each disease line into code and text name
        for disease_string in disease_strings
        for (code, _, disease_name) in [disease_string.partition(' ')]
    }
    # get groups separated by an empty line
    # isolate first item in each group as its name
    for x, (group_name, *disease_strings) in itertools.groupby(lines, bool) if x
}

{'Intestinal infectious diseases (001-003)': {1: 'Cholera',
                                              2: 'Typhoid and paratyphoid '
                                                 'fevers',
                                              3: 'Other salmonella infections'},
 'Tuberculosis (004-006)': {4: 'Primary tuberculous infection',
                            5: 'Pulmonary tuberculosis',
                            6: 'Other respiratory tuberculosis'}}