Python fifth day, two knowledge points three mesh operator and assert throw exception handling.

Source: Internet
Author: User
Tags throw exception

There were no trinocular operators before Python 2.5x, but with the development of language, three mesh operators were added after 2.5

1 " "2 here the main three-mesh operator3 It is also possible to quickly declare variables and assign values to variables by x,y=4,5 this way. 4 " "5x,y=4,56 ifx<y:7Small=x8 Else:9Small=yTen Print(small) One  A  - Print("after the-----is changed to the three mesh operator----")     -Small=xifX<yElsey the Print(small)

Sometimes we in the development process, the program will be running when the possibility of a false pre-judgment, then we use what method to pre-judgment, this time we use the Assert this function, its role is, when the pre-judgment after the establishment, then run, if not, throw an exception.

  

1 " " 2 simple usage of assert 3 " " 4 a,b=3,65assert a>b6print(" performed ")

We judge A>b after the assert, but we can see by the assignment that it is not true, and this time the assert throws an exception:

Traceback (most recent):   " e:/python/day-1/three mesh. PY "  in <module>    b=3.6Typeerror:cannot Unpack non-iterable Float Object

But if the conditions in the assert change to B>a, then the program prints "executed."

 

Python fifth day, two knowledge points three mesh operator and assert throw exception handling.

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