在Python中將* args傳遞給string.format？

Question

是否可以將* args傳遞給string.format？我有以下功能：

@classmethod 
def info(cls, component, msg, *args): 
    """Log an info message""" 
    cls.__log(cls.Level.INFO, component, msg, args) 

@classmethod 
def __log(cls, level, component, msg, *args): 
    """Log a message at the requested level""" 
    logging.getLogger("local").log(level, " - ".join([component, msg.format(args)])) 

當我試圖單元測試與LogCapture我得到如下：

def test_logWithArgs(self): 
    Logger.level(Logger.Level.INFO) 
    with LogCapture(level=Logger.Level.INFO) as lc: 
     Logger.info("MyComponent", "{0}", "TestArg") 
     lc.check(("local", "INFO", "MyComponent - TestArg")) 


AssertionError: Sequence not as expected: 

same: 
() 

first: 
(('local', 'INFO', 'MyComponent - TestArg'),) 

second: 
(('local', 'INFO', "MyComponent - (('TestArg',),)"),) 

Answer 1

我想你想要做的是

msg.format(*args) 

Answer 2

是它是。

>>> a=(1,2,3,4) 
>>> "{0}{1}{2}{3}".format(*a) 
'1234'