Changed the initial URL to a valid link in the Azure Computer Vision demo. The previous URL does not appear to be avaialble

This fixes an error that was caused by the breaking API change from the python SDK commit:  Azure/azure-sdk-for-python@99668db

Author: kyichii

samples/vision/computer_vision_extract_text.py

@@ -1,7 +1,6 @@
 from azure.cognitiveservices.vision.computervision import ComputerVisionClient
 from msrest.authentication import CognitiveServicesCredentials
-from azure.cognitiveservices.vision.computervision.models import TextRecognitionMode
-from azure.cognitiveservices.vision.computervision.models import TextOperationStatusCodes
+from azure.cognitiveservices.vision.computervision.models import ReadOperationResult, OperationStatusCodes
 import time
 
 '''
@@ -27,30 +26,39 @@
 # Create client
 client = ComputerVisionClient(endpoint, credentials)
 
-url = "https://azurecomcdn.azureedge.net/cvt-1979217d3d0d31c5c87cbd991bccfee2d184b55eeb4081200012bdaf6a65601a/images/shared/cognitive-services-demos/read-text/read-1-thumbnail.png"
-mode = TextRecognitionMode.handwritten
+# change this URL to reflect the image that you would like to test.
+url = "https://azurecomcdn.azureedge.net/cvt-181c82bceabc9fab9ec6f3dca486738800e04b45a0b3c1268609c94f4d67173a/images/shared/cognitive-services-demos/analyze-image/analyze-6-thumbnail.jpg"
+# image_path = "images/computer_vision_ocr.png"
+lang = 'en'
 raw = True
 custom_headers = None
-numberOfCharsInOperationId = 36
 
-# Async SDK call
-rawHttpResponse = client.batch_read_file(url, mode, custom_headers,  raw)
+# Read an image from a url
+rawHttpResponse = client.read(url, language=lang, custom_headers=custom_headers, raw=raw)
+
+# Uncomment the following code and comment out line 37 to read from image stream
+# with open(image_path, "rb") as image_stream:
+#     rawHttpResponse = client.read_in_stream(
+#         image=image_stream, language=lang,
+#         # Raw will return the raw response which can be used to find the operation_id
+#         raw=True
+#     )
 
 # Get ID from returned headers
 operationLocation = rawHttpResponse.headers["Operation-Location"]
-idLocation = len(operationLocation) - numberOfCharsInOperationId
-operationId = operationLocation[idLocation:]
+operationId = operationLocation.split('/')[-1]
 
 # SDK call
 while True:
-    result = client.get_read_operation_result(operationId)
-    if result.status not in ['NotStarted', 'Running']:
+    result = client.get_read_result(operationId)
+    if result.status not in [OperationStatusCodes.not_started, OperationStatusCodes.running]:
         break
     time.sleep(1)
 
 # Get data: displays text captured and its bounding box (position in the image)
-if result.status == TextOperationStatusCodes.succeeded:
-    for textResult in result.recognition_results:
-        for line in textResult.lines:
+
+if result.status == OperationStatusCodes.succeeded:
+    for read_result in result.analyze_result.read_results:
+        for line in read_result.lines:
             print(line.text)
             print(line.bounding_box)