title: Python CSV.Writer changing saving path
body: <p>I would like to have my tkinter program prompt the user to select the path the want to save the file which will be produced by the program.</p>
  
  <p>My code looks like this. At this stage the program only saves to one file (the one I defined to test the program)
  What code would I use to have <code>'test_write.csv'</code> changed to any file the user chooses?</p>
  
  <pre><code>           ##Writing to .cvs file       
             with open('test_write.csv', 'w') as fp:
                 a = csv.writer(fp)
                 # write row of header names
                 a.writerow(n)
  </code></pre>
  
  <p>Thank you</p>