adding chapter 7 source code

Chapter7/multithreading/thread_casestudy-extra.py

@@ -0,0 +1,22 @@
+# this is a code without using any threads
+from time import time
+
+from getfilelistpy import getfilelist
+import gdown
+
+resource = {
+    "api_key": "AIzaSyDYKmm85keqnk4bF1DpYa2bxddKrGns4z0",
+    "id": "0B8TxHW2Ci6dbckVweTRtTlV3RUU",
+    "fields": "files(name,id,webContentLink)",
+}
+
+res = getfilelist.GetFileList(resource)
+files_list = res['fileList'][0]
+
+t1 = time()
+for item in files_list['files']:
+    gdown.download( item['webContentLink'],
+                    './files/{}'.format(item['name']),
+                    quiet=False)
+
+print('Time taken to download: %s seconds', time() - t1)