Explicit Exception problem with try function

Question

I have to run codes irrespective whether it fails or not. I'm using ExplicitException. Following is my code:

try:
    G.add_edge(data1[0][0],data1[1][0],weight=data1[2+i][0])
except ExplicitException:
    pass

try:
    G.add_edge(data1[0][0],data1[5][0],weight=data1[6+i][0])
except ExplicitException:
    pass

try:
    G.add_edge(data1[0][0],data1[9][0],weight=data1[10+i][0])
except ExplicitException:
    pass   

try:
    G.add_edge(data1[0][0],data1[13][0],weight=data1[14+i][0])
except ExplicitException:
    pass

I'm getting the following error:

NameError: name 'ExplicitException' is not defined

would appreciate some help

https://stackoverflow.com/questions/17322208/multiple-try-codes-in-one-block — Omer Qureshi, Dec 01 '19 at 09:19
I want to run multiple functions in the try block and ignore the function if it fails and move to the next one. I found the above link which mentions explicit exceptions — Omer Qureshi, Dec 01 '19 at 09:20
He was referring to explicit exception type, there is no `ExplicitException`. — Guy, Dec 01 '19 at 09:20

Shubham Sharma · Accepted Answer · 2019-12-01T11:18:54.187

I guess you got that idea from this answer. The idea the answer was trying to convey was that you can use an exception of your choice. In reality, there is no such exception as ExplicitException. You can use any exception from the built-ins or define your own exception class.

You can also except the base class Exception and except all exceptions.

try:
    # code
except Exception:
    pass

EDIT: While you can go about adding multiple try-except blocks, it is not a good practice. In your case, I believe your exception is because of some invalid value of i which would throw out of bounds exception. So you can avoid this by checking for the right values of i in if-else conditions.

If you're really into using try-except, try generalizing the lines and consolidating them into a loop. That would make the error handling easier. For example in the case above:

for j in range(1,14,4):
    try:
        G.add_edge(data1[0][0],data1[j][0],weight=data1[1+j+i][0])
    except:
        pass

Is there any faster way. I have hundreds of lines of code. Cant do all that manually? — Omer Qureshi, Dec 01 '19 at 09:25
`except` without specifying exception type also catches `sys.exit()` and `KeyboardInterrupt`. `except Exception` is better. — Maximouse, Dec 01 '19 at 10:21

Guy · Answer 2 · 2019-12-01T10:01:25.093

There is no ExplicitException, in the thread you linked in the comments the OP is referring to explicit exception type. Since the code is repeating itself you can build a function and use it

def add_edge(first_indices, second_indices, weight_indices):
    try:
        G.add_edge(data1[first_indices[0]][first_indices[1]], data1[second_indices[0]][second_indices[1]], weight=data1[weight_indices[0]][weight_indices[1]])
    except (IndexError, TypeError):  # example to explicit exception
        pass

add_edge([0, 0], [1, 0], [2 + i, 0])
add_edge([0, 0], [5, 0], [6 + i, 0])
add_edge([0, 0], [9, 0], [10 + i, 0])
add_edge([0, 0], [13, 0], [14 + i, 0])

Explicit Exception problem with try function

2 Answers2

Linked