python字符串占位实际应用

 

    name = "Lucy"

    age = 20

    # 方式一：占位符,%s表示只能接受string, %d代表只能接受数字

    print("name is %s and age is %d" % (name, age))

    # format的用法1，需要用{n}作占位符，占位符从0开始

    print("name is {0} and age is {1}".format(name, age))

    # format的用法2，需要用{alias(别名)}作占位符

    print("name is {_name} and age is {_age}".format(_name=name, _age=age))