Ruby equivalent for Python's "try"?

I'm trying to convert some Python code into Ruby. Is there an equivalent in Ruby to the try statement in Python?

2

3 Answers

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.')

4

 begin some_code rescue handle_error ensure this_code_is_always_executed end

Details:

1

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

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