title: Cannot Concatenate 'str' and 'tuple' objects
body: <p>I am trying to make a shoe size to shoe code converter and use the conversion as a parameter for form data in python 2.7 requests</p>
  
  <pre><code>Size = raw_input('Size Number: ')
  if Size=='4':
      sizenumber = '530',
  elif Size=='4.5':
      sizenumber = '540',
  elif Size=='5':
      sizenumber = '550',
  elif Size=='5.5':
      sizenumber = '560',
  elif Size=='6':
      sizenumber = '570',
  elif Size=='6.5':
      sizenumber = '580',
  elif Size=='7':
      sizenumber = '590',
  elif Size=='7.5':
      sizenumber = '600',
  elif Size=='8':
      sizenumber = '610',
  elif Size=='8.5':
      sizenumber = '620',
  elif Size=='9':
      sizenumber = '630',
  elif Size=='9.5':
      sizenumber = '640',
  elif Size=='10':
      sizenumber = '650',
  elif Size=='10.5':
      sizenumber = '660',
  elif Size=='11':
      sizenumber = '670',
  elif Size=='11.5':
      sizenumber = '680',
  elif Size=='12':
      sizenumber = '690',
  elif Size=='12.5':
      sizenumber = '700',
  elif Size=='13':
      sizenumber = '710',
  elif Size=='13.5':
      sizenumber = '720',
  elif Size=='14':
      sizenumber = '730',
  elif Size=='14.5':
      sizenumber = '740',
  elif Size=='15':
      sizenumber = '750',
  elif Size=='15.5':
      sizenumber = '760',
  elif Size=='16':
      sizenumber = '770',
  </code></pre>
  
  <p>and then where i am using 'sizenumber'</p>
  
  <p>'pid': onlypid + '_' + sizenumber</p>
  
  <p>the 'pid' on the site consists of the product id which i have set as onlypid then _ sizenumber, (productid_sizenumber)</p>
  
  <p>the error i keep getting is 
  TypeError: cannot concatenate 'str' and 'tuple' objects, any tips or solutions are greatly appreciated. Thanks :)</p>