f-string的用法
f-strings 是指以 f 或 F 开头的字符串，其中以 {} 包含的表达式会进行值替换。下面看下 f-strings 的使用方法
1.基本使用
>>> name = 'hoxis'
>>> age = 18
>>> f"hi, {name}, are you {age}"
'hi, hoxis, are you 18'
>>> F"hi, {name}, are you {age}"
'hi, hoxis, are you 18'
2.运算表达式
>>> f"{ 2 * 3 + 1}"
'7'
3.调用函数
>>> def test(input):
... return input.lower()
...
>>> name = "Hoxis"
>>> f"{test(name)} is handsome."
'hoxis is handsome.'
也可以直接调用内置函数：
>>> f"{name.lower()} is handsome."
'hoxis is handsome.'
4.在类中使用
class Person:
... def __init__(self,name,age):
... self.name = name
... self.age = age
... def __str__(self):
... return f"{self.name} is {self.age}"
... def __repr__(self):
... return f"{self.name} is {self.age}. HAHA!"
>>> hoxis = Person("hoxis",18)
>>> f"{hoxis}"'hoxis is 18'
>>> f"{hoxis!r}"'hoxis is 18. HAHA!'
>>> print(hoxis)hoxis is 18
>>> hoxishoxis is 18. HAHA!
5.多行 f-string
>>> name = 'hoxis'
>>> age = 18
>>> status = 'Python'
>>> message = {... f'hi {name}.'
... f'you are {age}.'
... f'you are learning {status}.'
... }
>>> message{'hi hoxis.you are 18.you are learning Python.'}
这里需要注意，每行都要加上 f 前缀，否则
**** Hidden Message ***** 2021 前来考古 2021 前来考古
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