title: matplotlib: ImportError: cannot import name 'pyplot'
body: <p>I have matplotlib lib installed using pip but when I run this code it gives me this error:</p>
  
  <pre><code>shar@shar-Lenovo-G50-30 ~ $ python3 opencv.py
  Traceback (most recent call last):
    File "opencv.py", line 3, in &lt;module&gt;
      from matplotlib import pyplot as plt
  ImportError: cannot import name 'pyplot'
  </code></pre>
  
  <p>My code is:</p>
  
  <pre><code>import numpy as np
  import cv2
  from matplotlib import pyplot as plt
  
  img1 = cv2.imread('/home/shar/home.jpg',0)  # queryImage
  img2 = cv2.imread('/home/shar/home2.jpg',0) # trainImage
  
  # Initiate SIFT detector
  orb = cv2.ORB()
  
  # find the keypoints and descriptors with SIFT
  kp1, des1 = orb.detectAndCompute(img1,None)
  kp2, des2 = orb.detectAndCompute(img2,None)
  # create BFMatcher object
  bf = cv2.BFMatcher(cv2.NORM_HAMMING, crossCheck=True)
  
  # Match descriptors.
  matches = bf.match(des1,des2)
  
  # Sort them in the order of their distance.
  matches = sorted(matches, key = lambda x:x.distance)
  
  # Draw first 10 matches.
  img3 = cv2.drawMatches(img1,kp1,img2,kp2,matches[:10], flags=2)
  
  plt.imshow(img3),plt.show()
  </code></pre>
  
  <p>I also tried to install matplotlib from source and that still give me the error.</p>