python - String building: Hiding string length? -

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I am amending the Python code and I came to this statement and I do not know what it means and neither does it I can get anything on it uncertain about it that it is out of context .. 

  conn.queue.put ('% x \ r \ n% s \ r \ N '% (lane (piece), part) if fallen second part)   
 The code is inserting a piece in a threaded queue which sends it later. My question is what's happening here '% x \ r \ n% s \ r \ n' It appears that by adding the length of the string it is hidden with a cart return? Apart from this, I came to know that if there is no statement as to what will be the "chosen second part". "Text" itemprop = "text"> 
 This is not a statement in which there is no body, it is a conditional expression  A if condition is the other B  to  a   condition  is true, otherwise it evaluates for  B  in this case:  
  '% X \ r \ n% s \ r \ n '% (lane, piece) if the piece of the second piece is   
 either:  
  '% X \ r \ n% s \ r \ n'% (lane, piece)   
 or just  chuck , it depends on What  Chankd  is correct or not, consequently  conn.queue.put .

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