title: Syntax error when trying to parse arguments Python shell
body: <p>I have some code that I am trying to run in a Python shell (IDLE) but there seems to be a problem with the way I am parsing arguments in the Python shell.</p>
  
  <p>Here is the code:</p>
  
  <pre><code># import the necessary packages
  from skimage.segmentation import slic
  from skimage.segmentation import mark_boundaries
  from skimage.util import img_as_float
  from skimage import io
  import matplotlib.pyplot as plt
  import argparse
  
  # construct the argument parser and parse the arguments
  ap = argparse.ArgumentParser()
  ap.add_argument("-i", "--image", required = True, help = "Path to the image")
  args = vars(ap.parse_args())
  
  # load the image and convert it to a floating point data type
  image = img_as_float(io.imread(args["image"]))
  
  # loop over the number of segments
  for numSegments in (100, 200, 300):
      # apply SLIC and extract (approximately) the supplied number
      # of segments
      segments = slic(image, n_segments = numSegments, sigma = 5)
  
      # show the output of SLIC
      fig = plt.figure("Superpixels -- %d segments" % (numSegments))
      ax = fig.add_subplot(1, 1, 1)
      ax.imshow(mark_boundaries(image, segments))
      plt.axis("off")
  
  # show the plots
  plt.show()
  </code></pre>
  
  <p>When I try to run the program with the line <code>Slic.py --image 0021.jpg</code> I get <code>SyntaxError: invalid syntax</code>. Not sure what I am doing wrong, probably really obvious to some but any help is greatly appreciated.</p>
  
  <p>The code was found at the link below under the SLIC example at the bottom of the page, he even shows how to run the code but it doesn't work for me:</p>
  
  <p>www.pyimagesearch.com/2014/07/28/a-slic-superpixel-tutorial-using-python</p>