python - os.rename() move the directory but does not removed the old one. it worked like copy -

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I am running on 'C: \' and copying 'Y: in:' is it important ?

My code: 

  def Rename (src, dst): Try: if os.path.exists (dst): os.unlink (dst) os Renames (src, dst) Returns 0 except OSError, print: Print ("" '% s' to rename '% s':% (src, dst, os.strerror (err.errno)) < If you have a different file system, you would have to go to  shutil.move (src, dst), or    
 
 should use  
 to:  
 
 If the destination is on the existing file system, then os.rename () is used. Otherwise, src is copied (using shutil.copy2 ()) and then DST.

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