Update python-thumb.md

Author: v-jaswel

articles/cognitive-services/Computer-vision/QuickStarts/python-thumb.md

@@ -32,46 +32,49 @@ To create and run the sample, copy the following code into the code editor.
 import os
 import sys
 import requests
-# If you are using a Jupyter notebook, uncomment the following line.
+# If you are using a Jupyter notebook, uncomment the following lines.
 # %matplotlib inline
-import matplotlib.pyplot as plt
+# import matplotlib.pyplot as plt
 from PIL import Image
 from io import BytesIO
 
 # Add your Computer Vision subscription key and endpoint to your environment variables.
-if 'COMPUTER_VISION_SUBSCRIPTION_KEY' in os.environ:
-    subscription_key = os.environ['COMPUTER_VISION_SUBSCRIPTION_KEY']
-else:
-    print("\nSet the COMPUTER_VISION_SUBSCRIPTION_KEY environment variable.\n**Restart your shell or IDE for changes to take effect.**")
-    sys.exit()
-
-if 'COMPUTER_VISION_ENDPOINT' in os.environ:
-    endpoint = os.environ['COMPUTER_VISION_ENDPOINT']
+subscription_key = os.environ['COMPUTER_VISION_SUBSCRIPTION_KEY']
+endpoint = os.environ['COMPUTER_VISION_ENDPOINT']
 
 thumbnail_url = endpoint + "vision/v2.1/generateThumbnail"
 
 # Set image_url to the URL of an image that you want to analyze.
 image_url = "https://upload.wikimedia.org/wikipedia/commons/9/94/Bloodhound_Puppy.jpg"
 
+# Construct URL
 headers = {'Ocp-Apim-Subscription-Key': subscription_key}
 params = {'width': '50', 'height': '50', 'smartCropping': 'true'}
 data = {'url': image_url}
-response = requests.post(thumbnail_url, headers=headers,
-                         params=params, json=data)
+# Call API
+response = requests.post(thumbnail_url, headers=headers, params=params, json=data)
 response.raise_for_status()
 
+# Open the image from bytes
 thumbnail = Image.open(BytesIO(response.content))
 
-# Display the thumbnail.
-plt.imshow(thumbnail)
-plt.axis("off")
-
 # Verify the thumbnail size.
 print("Thumbnail is {0}-by-{1}".format(*thumbnail.size))
+
+# Save thumbnail to file
+thumbnail.save('thumbnail.png')
+
+# Display image
+thumbnail.show()
+
+# Optional. Display the thumbnail from Jupyter.
+# plt.imshow(thumbnail)
+# plt.axis("off")
 ```
 
 Next, do the following:
-1. Optionally, replace the value of `image_url` with the URL of a different image for which you want to generate a thumbnail.
+
+1. (Optional) Replace the value of `image_url` with the URL of your own image.
 1. Save the code as a file with an `.py` extension. For example, `get-thumbnail.py`.
 1. Open a command prompt window.
 1. At the prompt, use the `python` command to run the sample. For example, `python get-thumbnail.py`.