python中嵌套for循环的列表理解

我为循环写了以下内容，我希望将其转换为列表理解，如果有任何提示，我将不胜感激

car_dict  = {'mazda': ('G1',), 'toyota': ('G2',), 'nissan': ('G3', 'G2', 'G4')}
group_list = ['G1', 'G2', 'G3', 'G4']

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如果需要True False数组，可以执行以下操作：

car_dict  = {'mazda': ('G1',), 'toyota': ('G2',), 'nissan': ('G3', 'G2', 'G4')}
group_list = ['G1', 'G2', 'G3', 'G4']

in_group = [[group in val for key, val in car_dict.items()] 
            for group in group_list]
print(in_group)

# output
[[True, False, False], [False, True, True], [False, False, True], [False, False, True]]

in_group_names = {group: [key for key, val in car_dict.items() if group in val] 
                  for group in group_list}
print(in_group_names)

# output
{'G1': ['mazda'],
 'G2': ['toyota', 'nissan'],
 'G3': ['nissan'],
 'G4': ['nissan']}

如果您想了解汽车制造商的集团词典，请执行以下操作：

car_dict  = {'mazda': ('G1',), 'toyota': ('G2',), 'nissan': ('G3', 'G2', 'G4')}
group_list = ['G1', 'G2', 'G3', 'G4']

in_group = [[group in val for key, val in car_dict.items()] 
            for group in group_list]
print(in_group)

# output
[[True, False, False], [False, True, True], [False, False, True], [False, False, True]]

in_group_names = {group: [key for key, val in car_dict.items() if group in val] 
                  for group in group_list}
print(in_group_names)

# output
{'G1': ['mazda'],
 'G2': ['toyota', 'nissan'],
 'G3': ['nissan'],
 'G4': ['nissan']}