import json

jsonstring = '{"user_man":[{"name":"Peter"},{"name":"xiaoming"}],"user_woman":[{"name":"Anni"},{"name":"zhangsan"}]}'

print(json_data)
print(json_data['user_man'])
print(json_data['user_woman'])
print(json_data['user_man'][0])
print(json_data['user_man'][1])
print(json_data['user_man'][0]['name'])
print(json_data['user_man'][1]['name'])

输出：

D:\Python\venv\Scripts\python.exe D:/Python/venv/test10.py
{'user_man': [{'name': 'Peter'}, {'name': 'xiaoming'}], 'user_woman': [{'name': 'Anni'}, {'name': 'zhangsan'}]}
[{'name': 'Peter'}, {'name': 'xiaoming'}]
[{'name': 'Anni'}, {'name': 'zhangsan'}]
{'name': 'Peter'}
{'name': 'xiaoming'}
Peter
xiaoming

Process finished with exit code 0