如何在循环中同时处理列表中的两个值，属性错误

students = [{'name': 'Alice', 'age': 20}, {'name': 'Bob', 'age': 22}]
for i in range(len(students)):
    name = students[i]['name']
    age = students[i]['age']
    print(f"{name} is {age} years old.")

students = [{'name': 'Alice', 'age': 20}, {'name': 'Bob', 'age': 22}]
names = [student['name'] for student in students]
ages = [student['age'] for student in students]
for name, age in zip(names, ages):
    print(f"{name} is {age} years old.")

students = [{'name': 'Alice', 'age': 20}, {'name': 'Bob'}]
for student in students:
    print(student['age'])  # 这里会抛出KeyError，因为第二个字典没有'age'键

students = [{'name': 'Alice', 'age': 20}, {'name': 'Bob'}]
for student in students:
    age = student.get('age', 'Unknown')
    print(f"{student['name']} is {age} years old.")