Python：將執行語句作為函數參數傳遞

Question

retVal = None
retries = 5
success = False
while retries > 0 and success == False:
    try:
        retVal = graph.put_event(**args)
        success = True
    except:
        retries = retries-1
        logging.info('Facebook put_event timed out.  Retrying.')
return success, retVal

在上面的代碼中，我如何將整個事物作為一個函數包裝起來並使其成為任何命令（在此示例中，'graph.put_event（** args）'）可以作為要在其中執行的參數傳入功能？

Answer 1

直接回答你的問題：

def foo(func, *args, **kwargs):
    retVal = None
    retries = 5
    success = False
    while retries > 0 and success == False:
        try:
            retVal = func(*args, **kwargs)
            success = True
        except:
            retries = retries-1
            logging.info('Facebook put_event timed out.  Retrying.')
    return success, retVal

然后可以這樣調用：

s, r = foo(graph.put_event, arg1, arg2, kwarg1="hello", kwarg2="world")

順便說一下，鑒於上述任務，我會按照以下方式編寫：

class CustomException(Exception): pass

# Note: untested code...
def foo(func, *args, **kwargs):
    retries = 5
    while retries > 0:
        try:
            return func(*args, **kwargs)
        except:
            retries -= 1
            # maybe sleep a short while
    raise CustomException

# to be used as such
try:
    rv = foo(graph.put_event, arg1, arg2, kwarg1="hello", kwarg2="world")
except CustomException:
    # handle failure

Answer 2

def do_event(evt, *args, **kwargs):
   ...
      retVal = evt(*args, **kwargs)
   ...