代码1:
1 numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9]
2 for number in numbers:
3 if number == 1:
4 res='st'
5 if number == 2:
6 res='nd'
7 if number == 3:
8 res='rd'
9 else:
10 res='th'
11 print(f"{number}{res}")
结果：
python code1.py 1th 2th 3rd 4th 5th 6th 7th 8th 9th
代码2:
1 numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9]
2 for number in numbers:
3 if number == 1:
4 res='st'
5 elif number == 2:
6 res='nd'
7 elif number == 3:
8 res='rd'
9 else:
10 res='th'
11 print(f"{number}{res}")
结果：
python code1.py 1st 2nd 3rd 4th 5th 6th 7th 8th 9th
由此可见，code1中使用if时，只有number==3时，才发生改变，1和2时被3给覆盖了。code2中，使用elif时，三种情况1 2 3时全部进行处理，根据实际情况，只需要其中一种使用if并列即可。如果也许需要多种情况均满足，使用elif并列更加合理。
总之： =陈述语气，是设置值，也就是赋值，运算是从右到左侧
==疑问语气，是条件判断，判断是否相等，运算是从左到右侧
标签：code1,elif,区别,python,res,number,numbers From： https://www.cnblogs.com/guochaoxxl/p/16655460.html