python - What does it mean to have two parameters in a getattr()? -

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अजगर आधिकारिक डॉक्टर से, मैंने getattr () की सामान्य अभिव्यक्ति देखी;

getattr (ऑब्जेक्ट , नाम [, डिफ़ॉल्ट])

मैंने इसे बहुत अच्छी तरह समझ लिया उदाहरण के लिए, मैं कर सकता हूँ: 

 > gt; & gt; def a (): ... pass ... & gt; & gt; & gt; C = 2> gt; & gt; & gt; Getattr (a, 'b', c) 2   
 लेकिन अब मैं देख रहा हूँ कोड में, लेखक एक पैटर्न का उपयोग करता है:  
  getattr (ए, बीएक्स) (द्वारा)   
 और मुझे 'ए' ऑब्जेक्ट में 'बी' भी नहीं मिला!  
 यह मुझे बहुत उलझन में है, क्या करता है इस कोड का मतलब है?  
 
 परिशिष्ट 1:  
 getattr () आयात के बहुत सारे बयानों के बीच है। और मूल अभिव्यक्ति की तरह है:  
  से टर्नडाडो। विकल्प आयात परिभाषित करें, विकल्प आयात सेटिंग्स सेटिंग Getattr (सेटिंग्स, options.env) (options.server_name)    
 
 
  बी  एक वस्तु है, शाब्दिक नहीं इस कोड के लेखक कह रहे हैं कि "मुझे  a  की विशेषता प्राप्त करें जिसका नाम जो कुछ भी  bx  है, और इसे  जो कुछ भी  पास करता है  है "।

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