【求助】pandas groupby agg仅合并单元格，不计算怎么弄？

#定义dataframe
data = {'Name': ['Alice', 'Bob', 'Charlie', 'David', 'Emily', 'Frank', 'Grace', 'Henry', 'Ivan', 'Jack'],
        'Gender': ['F', 'M', 'M', 'M', 'F', 'M', 'F', 'M', 'M', 'M'],
        'Age': [25, 30, 35, 40, 45, 50, 55, 60, 65, 70],
        'City': ['Beijing', 'Shanghai', 'Guangzhou', 'Shenzhen', 'Beijing', 'Shanghai', 'Beijing', 'Shenzhen', 'Guangzhou', 'Shanghai'],
        'Salary': [5000, 8000, 6000, 7000, 9000, 5500, 7500, 6500, 7000, 10000]}
df = pd.DataFrame(data)

#dataframe输出：
      Name Gender  Age       City  Salary
0    Alice      F   25    Beijing    5000
1      Bob      M   30   Shanghai    8000
2  Charlie      M   35  Guangzhou    6000
3    David      M   40   Shenzhen    7000
4    Emily      F   45    Beijing    9000
5    Frank      M   50   Shanghai    5500
6    Grace      F   55    Beijing    7500
7    Henry      M   60   Shenzhen    6500
8     Ivan      M   65  Guangzhou    7000
9     Jack      M   70   Shanghai   10000

#按照Gender分组
df = df.groupby('Gender').agg(lambda x:x)
print(df)

#报错
ValueError: Must produce aggregated value