创建一个字典，将员工信息保存到其中，员工工号为键， 其它信息为值； 从字典中获取员工工号为“a4”的员工信息； 遍历字典中所有员工信息，并输出； 更新字典： 将工号为a4的员工的月薪修改为4900； 删除列表中工号为a4的员工数据； 添加一名员工数据：工号a7，姓名李梅，月薪9000。

好的，我可以帮你完成这些操作。

1. 创建一个字典，将员工信息保存到其中，员工工号为键，其它信息为值：

employee_dict = {
    "a1": {
        "name": "Tom",
        "age": 28,
        "title": "Engineer",
        "department": "IT",
        "salary": 5000
    },
    "a2": {
        "name": "Jerry",
        "age": 30,
        "title": "Manager",
        "department": "HR",
        "salary": 8000
    },
    "a3": {
        "name": "Lucy",
        "age": 25,
        "title": "Designer",
        "department": "Design",
        "salary": 6000
    },
    "a4": {
        "name": "John",
        "age": 32,
        "title": "Engineer",
        "department": "IT",
        "salary": 5500
    }
}

2. 从字典中获取员工工号为“a4”的员工信息：

employee_a4 = employee_dict.get("a4")
print(employee_a4)

输出结果：

{'name': 'John', 'age': 32, 'title': 'Engineer', 'department': 'IT', 'salary': 5500}

3. 遍历字典中所有员工信息，并输出：

for employee_id, employee_info in employee_dict.items():
    print(f"Employee ID: {employee_id}")
    for key, value in employee_info.items():
        print(f"{key}: {value}")
    print()

输出结果：

Employee ID: a1
name: Tom
age: 28
title: Engineer
department: IT
salary: 5000

Employee ID: a2
name: Jerry
age: 30
title: Manager
department: HR
salary: 8000

Employee ID: a3
name: Lucy
age: 25
title: Designer
department: Design
salary: 6000

Employee ID: a4
name: John
age: 32
title: Engineer
department: IT
salary: 5500

4. 更新字典：将工号为a4的员工的月薪修改为4900：

employee_dict["a4"]["salary"] = 4900

5. 删除字典中工号为a4的员工数据：

del employee_dict["a4"]

6. 添加一名员工数据：工号a7，姓名李梅，月薪9000：

employee_dict["a7"] = {
    "name": "李梅",
    "age": 28,
    "title": "Manager",
    "department": "HR",
    "salary": 9000
}