我找到一个示例，您可以使用@trace或@trace('msg1','msg2')：不错！
def trace(*args):
def _trace(func):
def wrapper(*args, **kwargs):
print enter_string
func(*args, **kwargs)
print exit_string
return wrapper
if len(args) == 1 and callable(args[0]):
# No arguments, this is the decorator
# Set default values for the arguments
enter_string = 'entering'
exit_string = 'exiting'
return _trace(args[0])
else:
# This is just returning the decorator
enter_string, exit_string = args
return _trace
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