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Author: hasitharathnayake

Using_Python_to_Access_Web_Data/callingJsonApi.py

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+# prompt for a location, contact a web service and retrieve JSON for the web
+# service and parse that data, and retrieve the first place_id from the JSON.
+# A place ID is a textual identifier that uniquely identifies a place as within
+# Google Map
+import urllib.request,urllib.parse,urllib.error
+import ssl
+import json
+API_URL='http://py4e-data.dr-chuck.net/json?'
+
+# Ignore SSL certificate errors
+ctx = ssl.create_default_context()
+ctx.check_hostname = False
+ctx.verify_mode = ssl.CERT_NONE
+while True:
+    location=input('Enter a Location: ')
+    if len(location)<1:
+        location='South Federal University'
+        print('retrieving default Location: South Federal University')
+    url=API_URL+urllib.parse.urlencode({'address':location,'key':42})
+    reqHandApi=urllib.request.urlopen(url)
+    data=reqHandApi.read().decode()
+    # print(data)
+
+    try:
+        js = json.loads(data)
+    except:
+        js = None
+
+    if not js or 'status' not in js or js['status'] != 'OK':
+        print("ERROR, can't retrieve location")
+        # print(data)
+        continue
+    place_id=js['results'][0]['place_id']
+    print(place_id)
+
+    break