title: Error with back slash in python open statement
body: <p>Is there any way without typing <code>r</code> or 'double slash' to resolve this problem.because this two tricks change the type of file:</p>
  
  <pre><code>f = open('C:\Users\alireza\Desktop\exersices.python\p5.files\1.txt')
  </code></pre>
  
  <p>Error:</p>
  
  <pre><code>File "&lt;ipython-input-1-243f8d6a931c&gt;", line 1
      f = open('C:\Users\alireza\Desktop\exersices.python\p5.files\1.txt')
              ^
  SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in position 2-3: truncated \UXXXXXXXX escape
  </code></pre>