title: Pandas Plotly assign colors by label
body: <p>I'm plotting 7 different DataFrames and I'm trying to assign them color according to my labels but when I do it I get the error</p>
  <blockquote>
  <p>ValueError: All arguments should have the same length. The length of
  argument <code>color</code> is 7, whereas the length of  previously-processed
  arguments ['x', 'wide_variable_0', 'wide_variable_1',
  'wide_variable_2', 'wide_variable_3', 'wide_variable_4',
  'wide_variable_5', 'wide_variable_6'] is 73</p>
  </blockquote>
  <p>I'm lost because why would he try to label according to the x axis? That's the only one with 73 values. Also I don't know where do those wide_variables come from.</p>
  <p>This is the code I'm using, it works fine unless I try to assign colors:</p>
  <pre><code>fig = px.line(df, 
          y = [ejey.sin_vac_uci, ejey2.una_dosis_uci, ejey3.dos_dosis_uci, ejey4.dos_dosis_comp_uci, ejey5.dosis_unica_uci, ejey6.dosis_unica_comp_uci,
           ejey7.dosis_ref_comp_uci],
          x = df.semana_epidemiologica, 
           title='Incidencia en UCI',
           color=df.columns[8:], 
           )
      fig.show()
  </code></pre>
  <p>When I print(df.columns[8:]) I see exactly what I want: An array of 7 different labels but for some reason python is expecting 73..</p>