Change calculator example to use new dict syntax for a typeless struct

examples/calculator_client.py

@@ -53,13 +53,19 @@ def main(host):
 
     print('Evaluating a literal... ', end="")
 
-    # Set up the request. Note the form is 'evaluate' + '_request', where
-    # 'evaluate' is the name of the method we want to call
+    # Make the request. Note we are using the shorter function form (instead
+    # of evaluate_request), and we are passing a dictionary that represents a
+    # struct and its member to evaluate
+    eval_promise = calculator.evaluate({"literal": 123})
+
+    # This is equivalent to:
+    '''
     request = calculator.evaluate_request()
     request.expression.literal = 123
 
     # Send it, which returns a promise for the result (without blocking).
     eval_promise = request.send()
+    '''
 
     # Using the promise, create a pipelined request to call read() on the
     # returned object. Note that here we are using the shortened method call
@@ -88,7 +94,8 @@ def main(host):
     # Get the "subtract" function from the server.
     subtract = calculator.getOperator(op='subtract').func
 
-    # Build the request to evaluate 123 + 45 - 67.
+    # Build the request to evaluate 123 + 45 - 67. Note the form is 'evaluate'
+    # + '_request', where 'evaluate' is the name of the method we want to call
     request = calculator.evaluate_request()
     subtract_call = request.expression.init('call')
     subtract_call.function = subtract
@@ -110,6 +117,22 @@ def main(host):
 
     print("PASS")
 
+    '''
+    Note: a one liner version of building the previous request (I highly
+    recommend not doing it this way, but I just wanted to demonstrate it is
+    possible to set all of the fields with a dictionary):
+
+    eval_promise = calculator.evaluate({"call": 
+                                           {"function": subtract,
+                                            "params": [{"call":
+                                                {"function": add,
+                                                 "params": 
+                                                    [{"literal": 123},
+                                                     {"literal": 45}]
+                                                 }}, 
+                                                {"literal": 67.0}]}})
+    '''
+
     '''Make a request to evaluate 4 * 6, then use the result in two more
     requests that add 3 and 5.