title: Matplotlib: multiple lines plot
body: <p>My dataframe looks like this:</p>
  
  <pre><code>Bin           A      B      C   Proba-a%   Proba-b%   Proba-c%    gamma%
  CPB%                                                                    
  0.100     20841  23195  24546  34.503457  27.103303  22.859837     0.100
  0.200      2541   4187   5176  26.517913  13.944499   6.593338     0.200
  0.300      2750   1823   1122  17.875550   8.215217   3.067253     0.300
  0.400       999    829    448  14.736015   5.609856   1.659334     0.400
  0.500       604    495    217  12.837838   4.054181   0.977373     0.500
  0.600       436    348    116  11.467630   2.960495   0.612822     0.600
  0.700       367    247     76  10.314268   2.184230   0.373979     0.700
  0.800       305    186     35   9.355751   1.599673   0.263985     0.800
  0.900       280    115     24   8.475801   1.238254   0.188561     0.900
  1.000       200    102     18   7.847266   0.917691   0.131992     1.000
  </code></pre>
  
  <p>what I would like to do is to have on the x axis 'gamma%' and a chart with three lines A, B and C. I saw somewhere that you had to call multiple time plt, I tried that: </p>
  
  <pre><code>plt.plot(x='gamma%', y='A', data=df_b)
  plt.plot(x='gamma%', y='B',data=df_b)
  plt.plot(x='gamma%', y='C',data=df_b)
  </code></pre>
  
  <p>But I had the following error:</p>
  
  <pre><code>ValueError: Using arbitrary long args with data is not supported due to ambiguity of arguments.
  Use multiple plotting calls instead.
  </code></pre>
  
  <p>Any idea? Thanks!</p>