title: Python plotting error bars with different values above and below the point
body: <p>Warning: I'm very new to using python.</p>
  
  <p>I'm trying to graph data using error bars but my data has different values for the error above and below the bar, i.e. 2+.75,2-.32. </p>
  
  <pre><code>import numpy as np
  import matplotlib.pyplot as plt
  
  # example data
  x = (1,2,3,4)
  y = (1,2,3,4)
  
  # example variable error bar values
  yerr = 0.2
  
  plt.figure()
  plt.errorbar(x, y, yerr,"r^")
  plt.show()
  </code></pre>
  
  <p>But I want the error bar above the point to be a specific value like .17 and below the point to be a specific point like .3
  Does anyone know how to do this?</p>
  
  <p>Thanks!</p>