title: ValueError: could not convert string to float: '" "'
body: <p>I have some values is csv file and In csv file some values are numeric and some are string number. 
  Example of csv file:</p>
  
  <pre><code>1,"1151226468812.22",100,1,467,999.00,999.95,15,1,999.00,999.95,998.50,999.95,15,999.01,1396,34,06092016091501.444,1394627.25
  2,"1151226468812.11",100,1,467,999.00,1000.00,1605,3,999.00,1000.00,998.50,1000.00,5,999.03,1426,37,06092016091502.111,1424626.50
  </code></pre>
  
  <p>So I wnated to convert string to float. So here is my code:</p>
  
  <pre><code>datareader = csv.reader(datafile, delimiter=",", quoting= csv.QUOTE_NONE)
  
      names =  []
      names.append("local_timestamp")
      names.append("nse_timestamp")
  for row in datareader:
          data = dict()
          data.update(local_timestamp = row[0])
          data.update(nse_timestamp = float(row[1]))
  </code></pre>
  
  <p>But it return value error. </p>
  
  <pre><code>ValueError: could not convert string to float: '"1151226468812.22"'
  </code></pre>