如何在Python中使用带有exec的嵌套%打印格式？

# 定义变量
name = "Alice"
age = 30

# 定义嵌套的格式化字符串
code = """
message = "Hello, %s! You are %d years old." % (name, age)
print(message)
"""

# 使用 exec 执行代码
exec(code)

Hello, Alice! You are 30 years old.

# 定义变量
name = "Alice"
age = 30

# 定义嵌套的格式化字符串
code = """
message = "Hello, {}! You are {} years old.".format(name, age)
print(message)
"""

# 使用 exec 执行代码
exec(code)

# 定义变量
name = "Alice"
age = 30

# 定义嵌套的格式化字符串
code = f"""
message = f"Hello, {name}! You are {age} years old."
print(message)
"""

# 使用 exec 执行代码
exec(code)