title: ValueError: could not convert string to float: −0,5063291139
body: <p>This is part of large csv file ( I show you only first column):</p>
  
  <pre><code>0
  0
  0
  −0,5063291139
  0,5063291139
  0
  0
  0,6666666667
  </code></pre>
  
  <p>I am getting only data from first column. When I am trying to covert these to float:</p>
  
  <pre><code>with open("GOLD.csv") as f:
      reader = csv.reader(f ,delimiter=",")
      for row in reader:
          print float(row[0])
  </code></pre>
  
  <p>I get:</p>
  
  <pre><code>ValueError: could not convert string to float: −0,5063291139
  </code></pre>
  
  <p>Where is the problem?</p>