1, using the format:
if Condition 1:
1 thing
elif Condition 2:
2 things
else condition 3:
3 things
Description: When the condition 1 is satisfied, 1 point thing, and then the whole end if
When the condition 1 is not satisfied, it is judged that conditions 2, if the condition 2 is satisfied, the implementation of 2 things, then the end of the whole if
When the condition 1 is not satisfied, the condition 2 is not satisfied, if the condition 3 is satisfied, the implementation of 3 things, then the end of the whole if
2, if an arithmetic operation implemented trinocular
a if a>b else b
If a> b condition is satisfied, the operation is the result of three head a, b otherwise
