在python中的字符串格式化过程中，保持不转换所有参数

name = "John"
age = 25
message = "My name is {} and I am {} years old.".format(name, age)
print(message)

My name is John and I am 25 years old.

name = "John"
age = 25
message = "My name is {{}} and I am {{}} years old.".format(name, age)
print(message)

My name is {} and I am {} years old.