Why do we need the quot;finallyquot; clause in Python?(为什么我们需要“finally?Python中的子句?)
问题描述
我不确定为什么我们在 try...except...finally
语句中需要 finally
.在我看来,这个代码块
I am not sure why we need finally
in try...except...finally
statements. In my opinion, this code block
try:
run_code1()
except TypeError:
run_code2()
other_code()
使用 finally
与这个相同:
try:
run_code1()
except TypeError:
run_code2()
finally:
other_code()
我错过了什么吗?
推荐答案
早点回来会有所不同:
try:
run_code1()
except TypeError:
run_code2()
return None # The finally block is run before the method returns
finally:
other_code()
比较一下:
try:
run_code1()
except TypeError:
run_code2()
return None
other_code() # This doesn't get run if there's an exception.
其他可能导致差异的情况:
Other situations that can cause differences:
- 如果在 except 块内抛出异常.
- 如果在
run_code1()
中抛出异常但不是TypeError
. - 其他控制流语句,例如
continue
和break
语句.
- If an exception is thrown inside the except block.
- If an exception is thrown in
run_code1()
but it's not aTypeError
. - Other control flow statements such as
continue
andbreak
statements.
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