Python: Rerun try-except loop

Question

I'm trying to rerun a try-except loop each time there is an error and only break when there is no error.

loop = True;
    while loop == True:
        try:
            for i in data_names:
                #do something
        except Exception, e:
            e = str(e)[0:100];
            parse_error_list.append(str(e)[str(e).rindex(':')+2:str(e).rindex(':')+4]);

            if len(e) == 0:
                loop = False;

As a sanity check, will the following allow me to exit the loop if and only if there is no error?

EDIT: Is the answer? If so, is this the most efficient implementation? ...

loop = True;
    while loop:
        try:
            for i in data_names:
                #do something
        except Exception, e:
            e = str(e)[0:100];
            parse_error_list.append(str(e)[str(e).rindex(':')+2:str(e).rindex(':')+4]);

        if e:
            loop = False;

The indentation seems to be messed up. Can you please fix the indentation in the code. — Sunny Nanda
– Sunny Nanda, Commented Feb 11, 2014 at 5:04
the only break condition I can see is if the string representation of your exception is 0-length; i.e. never. Also using actual break is a much saner way to break out of a loop than specifying a variable to do it for you. — roippi
– roippi, Commented Feb 11, 2014 at 5:04
Like the following? try: for i in data_names: #do something except Exception, e: e = str(e)[0:100]; parse_error_list.append(str(e)[str(e).rindex(':')+2:str(e).rindex(':')+4]); break; Why doesn't len(e) == 0 for no error break the loop? — Black
– Black, Commented Feb 11, 2014 at 5:10
because the except block never happens if there's no exception. You're checking len(e) inside the except block.. — roippi
– roippi, Commented Feb 11, 2014 at 5:13
except Exception, e: e = str(e)[0:100]; parse_error_list.append(str(e)[str(e).rindex(':')+2:str(e).rindex(':')+4]); if len(e) == 0: loop = False; Ah right. Would the above work? — Black
– Black, Commented Feb 11, 2014 at 5:20

Othrayte · Accepted Answer · 2014-02-11 06:43:42Z

2

The neatest solution would probably resemble:

while True:
    try:
        for i in data_names:
            #do something
    except Exception, e:
        #log or otherwise handle exception
    else:
        break

answered Feb 11, 2014 at 6:43

Othrayte

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