title: kwargs for linestyle and linecolour within the axvline and axhline with matplotlib
body: <p>Essentially, I am trying to plot a vertical line at the axis position x=1 that has the -.k styling, however, it seems that I cannot use this kwarg within the axvline argument: </p>
  
  <pre><code>pyplot.axvline(x=1,ymin=0,ymax=0.35, '-.k')
  </code></pre>
  
  <p>Returns the error:</p>
  
  <pre><code>File "&lt;ipython-input-70-04f296edd639&gt;", line 7
      pyplot.axvline(x=1,ymin=0,ymax=0.35, '-.k')
  SyntaxError: non-keyword arg after keyword arg
  </code></pre>
  
  <p>Hence, could someone advise me on what the correct kwarg is for this situation...</p>