Comparison of two methods of handling errors in Python

What I call the way to deal with errors is actually try:,except and raise .

First throws an instance,

Dictt={' A ': 1, ' B ': 2, ' C ': 3}try:    if dictt[' d ']>1:   #字典中没有 ' d '        print ("right!") Except Keyerror:print ("There is no ' d '")

The running result of the program:

There is no ' d '

Instead of raise, the result is:

Obviously, because the ' f ' does not exist, the if cannot be executed, causing the raise to execute

The difference between the two (Try:,except and raise):

The former, no matter what the conditions in the if, can be run, no error, and the latter, if the conditions to meet a certain standard, otherwise raise cannot run. Also, raise will interrupt the program, showing a red error, and the red hint is set in raise.

In a word, the use of raise is generally of practical significance. Typical usage: Defines a function that takes multiple arguments, one of which is the wrong type, and it is appropriate to use raise for error hints.

Example:

#实现两个整数的加法运算def Summ (ADD1,ADD2):    if (Type (ADD1)) ==type (1) and (type (ADD2)) ==type (1):        return (ADD1+ADD2)    else:        raise TypeError ("The parameters should be integers")   

Comparison of two methods of handling errors in Python