python - Special use of args / kwargs -

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मुझे कुछ ऐसा करने की आवश्यकता है: 

  def func1 (a, * args, B = "BBB", ** kwargs): मुद्रित "a =% sb =% s args =% s kwargs =% s"% (a, b, args, kwargs)   
 तो ऐसा कॉल करना:  
  func1 ("एएएए", एच = "एचएचएच", जे = "जे जे जे")   
 उत्पादन का उत्पादन: < / P> 
  a = aaaa b = बीबीबी आर्ग्स = () kwargs = {'h': 'hhh', 'j': 'jjj'}   
 लेकिन  * आर्ग्स  के बाद एक डिफ़ॉल्ट नाम का तर्क देना संभव नहीं है ( SyntaxError: अमान्य सिंटैक्स )  
     
  •  यह क्यों अनुमति नहीं है?  
  •  क्या इसे लागू करने के लिए कोई पठनीय तरीका है? एकमात्र तरीका मुझे पता है  b = kwargs.pop ("b", "BBB") , लेकिन यह बहुत पठनीय नहीं है। मैं फ़ंक्शन कॉल परिभाषा में इसे पसंद करता हूं, जहां यह संबंधित है: यह एक पैरामीटर है जो  हमेशा  के पास एक मान होता है, या तो कोई डिफ़ॉल्ट मान या उपयोगकर्ता द्वारा दिये गए मान।  < / Ul> 
     संपादित करें  
     मैं  b  के सामने  args :  
      def func1 डाल सकता / सकती हूं ए, बी = "बीबीबी", * एल्ग्स, ** क्वार्ज): मुद्रित करें "a =% sb =% s args =% s kwargs =% s"% (a, b, args, kwargs)   
     लेकिन इसका मतलब यह होगा कि यह कॉल:  
      func1 ("एएएए", "सीसीसी", एच = "एचएचएच", जे = "जे जे जे")  < / प्री> 
      "सीसीसी"  से  बी  को निर्दिष्ट करता है, जो मुझे नहीं चाहिए। मैं चाहता हूं कि  b  को एक नामित आरजी होना चाहिए, कोई प्रचलित तर्क नहीं।   
     
     
     यह पायथन 3 () में बिल्कुल मान्य है;  कीवर्ड-केवल तर्कों  को शुरू किया।  
     पायथन 2.x में आपको  kwargs.pop , या उपयुक्त डेकोरेटर का उपयोग करना जारी रखना होगा:  
       
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