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I’m trying to convert some Python code into Ruby. Is there an equivalent in Ruby to the
try statement in Python?
Use this as an example:
begin # "try" block puts 'I am before the raise.' raise 'An error has occurred.' # optionally: `raise Exception, "message"` puts 'I am after the raise.' # won't be executed rescue # optionally: `rescue Exception => ex` puts 'I am rescued.' ensure # will always get executed puts 'Always gets executed.' end
The equivalent code in Python would be:
try: # try block print('I am before the raise.') raise Exception('An error has occurred.') # throw an exception print('I am after the raise.') # won't be executed except: # optionally: `except Exception as ex:` print('I am rescued.') finally: # will always get executed print('Always gets executed.')
begin some_code rescue handle_error ensure this_code_is_always_executed end
If you want to catch a particular type of exception, use:
begin # Code rescue ErrorClass # Handle Error ensure # Optional block for code that is always executed end
This approach is preferable to a bare “rescue” block as “rescue” with no arguments will catch a StandardError or any child class thereof, including NameError and TypeError.
Here is an example:
begin raise "Error" rescue RuntimeError puts "Runtime error encountered and rescued." end