format函数公式？

python format函数用法详解：

1、位置

print("hello {0}, this is {1}.".format("world", "python")) # 根据位置下标进行填充

print("hello {}, this is {}.".format("world", "python")) # 根据顺序自动填充

print("hello {0}, this is {1}. {1} is a new language.".format("world", "python")) # 同一参数可以填充多次

输出：

hello world, this is python.

hello world, this is python.

hello world, this is python. python is a new language.

2、key

obj = "world"

name = "python"

print("hello {obj}, this is {name}.".format(obj = obj, name = name))

输出：

hello world, this is python.

3、列表

list = ["world", "python"]

print("hello {names[0]}, this is {names[1]}.".format(names = list))

输出：

hello world, this is python.