请问怎么通过Python完成这个任务

通过上面数据完成下面两个问题（用Python）
1.通过filter语句来筛选出Grade为A的同学

2.通过map函数将上述同学的age + 1(对原数据结构有影响,尽量不要用lambda)

classes = [
    {"name":"n_1","age":24,"grade":"A"},
    {"name":"n_2","age":23,"grade":"B"},
    {"name":"n_3","age":28,"grade":"A"},
    {"name":"n_4","age":24,"grade":"A"},
    {"name":"n_5","age":25,"grade":"C"},
    {"name":"n_6","age":21,"grade":"D"},
    {"name":"n_7","age":27,"grade":"A"},
]
def f1(x):
    return x["grade"] == "A"
li = list(filter(f1,classes))
def f2(x):
    x["age"] += 1
    return x
list(map(f2,li))
print(li)

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classes = [
    {'name': '123', 'grade': 'A'}, {'name': '123', 'grade': 'B'}
]
print(list(filter(lambda x: 1 if x['grade'] == 'A' else 0, classes)))

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