title: Pandas: astype error string to float (could not convert string to float: '7,50')
body: <p>I am trying to convert a dataframe field from string to float in Pandas.</p>
  
  <p>This is the field:</p>
  
  <pre><code>In:
  
  print(merged['platnosc_total'].head(100))
  
  Out:
  
  0     0,00
  1     4,50
  2     0,00
  3     0,00
  4     0,00
  5     4,50
  6     6,10
  7     7,99
  8     4,00
  9     7,69
  10    7,50
  </code></pre>
  
  <p>Note the 7,50, in the last row, which seems to cause the error:</p>
  
  <pre><code>In: 
  
  merged['platnosc_total'].astype(float)
  
  Out:
  
  ValueError: could not convert string to float: '7,50'
  </code></pre>
  
  <p>Does this mean that the rest got converted, and only the row with 7,50 is the cause?</p>
  
  <p>How can I actually cast this field/column to float?</p>