exception-handling

try: import MySQLdb # some action except ImportError as err: # fallback code PyCharm gives a code inspection warning on that: 'MySQLdb' in try block with 'except ImportError' should also be defined in except block This inspection detects names that should resolve but don't. Due to dynamic dispatch and duck typing, this is possible in a limited but useful number of cases. Top-level and class-level items are supported better than instance items. Ok, I thought the warning is reasonable, because the fallback code assumes that 'MySQLdb' is not installed, while it could be some different error that

I have the following procedure which is used by some applications: procedure p1 is begin bla bla bla; end; But there is no exception handling block. So applications were written according this feature. Now I need to log errors in p1. But it shouldn't affect applications that use this procedure. Something like this: procedure p1 is begin bla bla bla; exception when others then log_error(sqlcode, sqlerrm); raise_new_exception (sqlcode, sqlerrm); end; In case of raise_application_error first parameter should be in range [-20000, -20999]. So if there raises exception no_data_found, it cannot raise

I have a method like... int f() { try { int i = process(); return i; } catch(Exception ex) { ThrowSpecificFault(ex); } } This produces a compiler error, "not all code paths return a value". But in my case ThrowSpecificFault() will always throw (the appropriate) exception. So I am forced to a put a return value at the end but this is ugly. The purpose of this pattern in the first place is because "process()" is a call to an external web service but need to translate a variety of different exceptions to match a client's expected interface (~facade pattern I suppose). Any cleaner way to do this?

Scenario is this: User has 2 windows on which s/he is logged in. S/he logs out of one, stays logged in on the other, and then on the latter, triggers some action, say a form submission. Initially, what happened is that it threw a invalid authenticity token error. I've updated the protect_from_forgery in ApplicationController to be with: :null_session so that instead of the Exception it throws a 401. Great! Now for step 2, rather than the user just seeing a line of text saying You need to sign in or sign up before continuing. , I'd like to redirect him/her back to the sign in page. This is

I need to rescue a Timeout::Error raised from a the Redis library but i'm running into a problem, rescuing that specific class doesn't seem to work. begin Redis.new( { :host => "127.0.0.X" } ) rescue Timeout::Error => ex end => Timeout::Error: Timeout::Error from /Users/me/.rvm/gems/ree-1.8.7-2011.03@gowalla/gems/redis-2.2.0/lib/redis/connection/hiredis.rb:23:in `connect' When i try to rescue Exception it still doesn't work begin Redis.new( { :host => "127.0.0.X" } ) rescue Exception => ex end => Timeout::Error: Timeout::Error from /Users/me/.rvm/gems/ree-1.8.7-2011.03@gowalla/gems/redis-2.2.0

i have made a program to print 1-100 prime numbers. please help me to throw exception for composite number in range of 1-100 numbers. i am a beginner so any help will be appreciated. public static void main(String[] args) { System.out.println("Prime numbers from 1 - 100 are :"); int i = 0; int x = 0; for (i = 1; i <= 100; i++) { int ctr = 0; for (x = i; x >= 1; x--) { if (i % x == 0) { ctr = ctr + 1; } } if (ctr == 2) { System.out.println(i); } } } I'd rather implement isPrime method and call it public static boolean isPrime(int value) { if (value <= 1) return false; // There's only one even