title: python pandas csv exporting
body: <p>I've problem exporting a dataframe to CSV file. </p>
  
  <p>Data types are String and Float64 values like this:</p>
  
  <pre><code>In [19]: segmenti_t0
  Out[19]:
  SEGM1  SEGM2
  AD     P.S.         8.3
         SCREMATO     0.6
  CRE    STD          1.2
  FUN    INTERO       0.0
         P.S.         2.0
         SCREMATO     0.0
  NORM   INTERO      13.1
         P.S.        69.5
         SCREMATO     5.2
  Name: Quota volume_t0
  </code></pre>
  
  <p>I try to export this dataframe with this command:</p>
  
  <pre><code>IN [20]: segmenti_t0.to_csv('C:Users\MarioRossi\prova.csv', sep=";")
  </code></pre>
  
  <p>When I try to open it with Excel or I try to import it in excel from the csv file with formatting parameters I obtain really strange formatting for float values like 69.5000 or 5.2.0000000 or date times formatting too like this:</p>
  
  <pre><code>NORM    INTERO  13.01
  NORM    P.S.    69.05.00
  NORM    SCREMATO    5.02
  </code></pre>
  
  <p>Consider that I m using European format ("," as decimal as I use to import the original raw data from csv files).</p>
  
  <p>Please help me: I developed a software (with GUI and so on) and I cant deliver it for that reason!</p>
  
  <p>Thanks</p>