#39;Checks on step format and convert into a list of steps.</span>

<span class="sd">    If the steps were defined with &quot;to&quot; and &quot;by&quot; they are converted into</span>
<span class="sd">    a list of steps. If the steps were set in a string, it is</span>
<span class="sd">    converted into a list.</span>

<span class="sd">    Parameters</span>
<span class="sd">    ----------</span>
<span class="sd">    step : list of str or str</span>
<span class="sd">        Specifies the forecast time step