一、传统：
1 number1=1.5 2 number2=3.8 3 sum=number1+number2 4 print(number1,"+",number2,"=",sum)
效果：
1 [root@localhost 100]# python p001_add_two_numbers.py
2 1.5 + 3.8 = 5.3
二、f{}
1 [root@localhost 100]# vim p001_add_two_numbers.py 2 number1=1.5 3 number2=3.8 4 sum=number1+number2 5 #print(number1,"+",number2,"=",sum) 6 print(f"{number1}+{number2}={sum}")
效果：
1 [root@localhost 100]# python p001_add_two_numbers.py
2 1.5+3.8=5.3
推测：f开头表示在字符串内支持大括号内的python 表达式