如何将小端存储模式转为大端存储模式？

如何将小端存储模式转为大端存储模式？

def<img alt=
""
 
src=
"
https://res.mianshigee.com/images/20190318/311436_1552912948524_5E24B608F716FAD62379E5609B3FC926
"
>swap(val):
val=((val<<
8
) & 
0
xFF
00
FF
00
 
| ((val>>
8
) & 
0
x
00
FF
00
FF)
return (val<<
16
)|(val>>
16
)