add py/DynamoDB-UpdateItem.py.

Update_Item DynamoDB

py/DynamoDB-UpdateItem.py

@@ -0,0 +1,21 @@
+import boto3
+
+    
+def increase_rating(keya,dynamodb=None):
+    if not dynamodb:
+        dynamodb = boto3.resource('dynamodb')
+
+    table = dynamodb.Table('hehe')
+    
+    response = table.update_item(
+        Key={'name': keya},
+        UpdateExpression="set alias=:val",
+        ExpressionAttributeValues={
+            ':val': 'hehe'},
+        ReturnValues="UPDATED_NEW")
+    return response
+   
+ 
+if __name__ == '__main__':
+    update_response = increase_rating("cxy")
+    print("Update movie succeeded:")