1. 形式

• if …if…if…else

• if…else if…else if… else

2.举例说明

• if …if…if…else

x = 4
if x > 1:
    print ('x > 1')
if x >2:
    print('x >2')
else:
    print('x = 1')
print('finish')

• if …elif…elif…else

x = 4
if x > 1:
    print ('x > 1')
elif x >2:
    print('x >2')
else:
    print(x)
print('finish')

3.输出结果

4.总结

• if与多个else if是分枝情况。只执行其中一条代码，只要第一个if条件成立，即使满足else if的条件也不会执行else
  if及else的内容
• if与多个if是并列情况，会顺序执行

参考文献

1.https://blog.csdn.net/qq_37787456/article/details/78548468?utm_medium=distribute.pc_relevant.none-task-blog-baidujs_baidulandingword-1&spm=1001.2101.3001.4242
2.https://blog.csdn.net/weixin_38098192/article/details/81502184?utm_medium=distribute.pc_relevant.none-task-blog-baidujs_title-4&spm=1001.2101.3001.4242
3.https://blog.csdn.net/qq_45172832/article/details/104141679