Ruby 相当于 Python 的“try”？
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Ruby equivalent for Python's "try"?
提问by thatonegirlo
I'm trying to convert some Python code into Ruby. Is there an equivalent in Ruby to the trystatement in Python?
我正在尝试将一些 Python 代码转换为 Ruby。Ruby 中是否有与tryPython 中的语句等效的语句？
采纳答案by óscar López
Use this as an example:
以此为例：
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
The equivalent code in Python would be:
Python 中的等效代码是：
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.')
回答by zengr
begin
some_code
rescue
handle_error
ensure
this_code_is_always_executed
end
Details: http://crodrigues.com/try-catch-finally-equivalent-in-ruby/
详情：http: //crodrigues.com/try-catch-finally-equivalent-in-ruby/
回答by Zags
If you want to catch a particular type of exception, use:
如果要捕获特定类型的异常，请使用：
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.
这种方法比裸露的“救援”块更可取，因为没有参数的“救援”将捕获 StandardError 或其任何子类，包括 NameError 和 TypeError。
Here is an example:
下面是一个例子：
begin
raise "Error"
rescue RuntimeError
puts "Runtime error encountered and rescued."
end
