【学习笔记】python格式化字符串三种方法的基本语法

​格式化字符串：将变量填充到字符串

% 占位符格式化字符串

举个栗子：
1. %s 字符串格式
2. %d 整数

name = 'jack'
age = 10

info1 = 'my name is %s, am %d years old' % (name, age)
info2 = 'my name is %s, am %d years old' % ('jerry', 40)

print(info1)
print(info2)

my name is jack, am 10 years old
my name is jerry, am 40 years old

format格式化字符串

可以使用key：value指定参数值

info3 = 'my name is {name}, my age is {age}'.format(name='angel', age=20)
print(info3)

my name is angel, my age is 20

也可以使用位置参数指定

info4 = 'my name is {0}, my age is {1}'.format('tom',19)
print(info4)

my name is tom, my age is 19

-f 格式化字符串

通过f/F来标记格式化字符串。

num1 = 1.9
num2 = 30.2
sum = num1 + num2
print(f"{num1} + {num2} = {sum}")

print(F'this is an info {info4}')

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