Python中format的常见用法

一、填充

1、按默认顺序填充

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

输出：My name is Alice and I am 25 years old.

2、指定位置

name = "Bob"
age = 30
print("My name is {1} and I am {0} years old.".format(age, name))

输出：My name is Bob and I am 30 years old.

3、通过key来填充

name = "Charlie"
age = 35
print("My name is {name} and I am {age} years old.".format(name=name, age=age))

输出：My name is Charlie and I am 35 years old.

4、通过下标填充

names=['Alice', 9]
print("My name is {name[0]} and I am {name[1]} years old.".format(name=names))
print("My name is {0[0]} and I am {0[1]} years old.".format(names))

输出：
My name is Alice and I am 9 years old.
My name is Alice and I am 9 years o