Python 3.8 中 f-strings 添加了一个"="，让f-strings使用起来更加方便
比如下面的代码
from datetime import date
user = 'durban'
member_since = date(1988, 1, 2)
print(f'{user=} {member_since=}')
运行后输出结果如下
user='durban' member_since=datetime.date(1988, 1, 2)
再比如下面的代码实例
from datetime import date
user = 'durban'
member_since = date(1988, 1, 2)
delta = date.today() - member_since
print(f'{user=!s} {delta.days=:,d}')
运行后输出结果如下
user=durban delta.days=11,937
再比如下面的代码实例
from math import cos, radians
theta = 45
print(f'{theta=} {cos(radians(theta))=:.3f}')
运行后结果如下
theta=45 cos(radians(theta))=0.707