[英]Ruby equivalent for Python's “try”?
我正在嘗試將一些 Python 代碼轉換為 Ruby。 Ruby 中是否有與 Python 中的try
語句等效的語句?
以此為例:
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
Python 中的等效代碼是:
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
詳情: http : //crodrigues.com/try-catch-finally-equivalent-in-ruby/
如果要捕獲特定類型的異常,請使用:
begin
# Code
rescue ErrorClass
# Handle Error
ensure
# Optional block for code that is always executed
end
這種方法比裸露的“救援”塊更可取,因為沒有參數的“救援”將捕獲 StandardError 或其任何子類,包括 NameError 和 TypeError。
下面是一個例子:
begin
raise "Error"
rescue RuntimeError
puts "Runtime error encountered and rescued."
end
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