route_guide_client.py minor changes (#36865)

<details><summary>old output</summary>

```
-------------- GetFeature --------------
Feature called Berkshire Valley Management Area Trail, Jefferson, NJ, USA at latitude: 409146138
longitude: -746188906

Found no feature at 
-------------- ListFeatures --------------
Looking for features between 40, -75 and 42, -73
Feature called Patriots Path, Mendham, NJ 07945, USA at latitude: 407838351
longitude: -746143763

Feature called 101 New Jersey 10, Whippany, NJ 07981, USA at latitude: 408122808
longitude: -743999179

Feature called U.S. 6, Shohola, PA 18458, USA at latitude: 413628156
longitude: -749015468

Feature called 5 Conners Road, Kingston, NY 12401, USA at latitude: 419999544
longitude: -740371136

Feature called Mid Hudson Psychiatric Center, New Hampton, NY 10958, USA at latitude: 414008389
longitude: -743951297

Feature called 287 Flugertown Road, Livingston Manor, NY 12758, USA at latitude: 419611318
longitude: -746524769

Feature called 4001 Tremley Point Road, Linden, NJ 07036, USA at latitude: 406109563
longitude: -742186778

Feature called 352 South Mountain Road, Wallkill, NY 12589, USA at latitude: 416802456
longitude: -742370183

Feature called Bailey Turn Road, Harriman, NY 10926, USA at latitude: 412950425
longitude: -741077389

Feature called 193-199 Wawayanda Road, Hewitt, NJ 07421, USA at latitude: 412144655
longitude: -743949739

Feature called 406-496 Ward Avenue, Pine Bush, NY 12566, USA at latitude: 415736605
longitude: -742847522

Feature called 162 Merrill Road, Highland Mills, NY 10930, USA at latitude: 413843930
longitude: -740501726

Feature called Clinton Road, West Milford, NJ 07480, USA at latitude: 410873075
longitude: -744459023

Feature called 16 Old Brook Lane, Warwick, NY 10990, USA at latitude: 412346009
longitude: -744026814

Feature called 3 Drake Lane, Pennington, NJ 08534, USA at latitude: 402948455
longitude: -747903913

Feature called 6324 8th Avenue, Brooklyn, NY 11220, USA at latitude: 406337092
longitude: -740122226

Feature called 1 Merck Access Road, Whitehouse Station, NJ 08889, USA at latitude: 406421967
longitude: -747727624

Feature called 78-98 Schalck Road, Narrowsburg, NY 12764, USA at latitude: 416318082
longitude: -749677716

Feature called 282 Lakeview Drive Road, Highland Lake, NY 12743, USA at latitude: 415301720
longitude: -748416257

Feature called 330 Evelyn Avenue, Hamilton Township, NJ 08619, USA at latitude: 402647019
longitude: -747071791

Feature called New York State Reference Route 987E, Southfields, NY 10975, USA at latitude: 412567807
longitude: -741058078

Feature called 103-271 Tempaloni Road, Ellenville, NY 12428, USA at latitude: 416855156
longitude: -744420597

Feature called 1300 Airport Road, North Brunswick Township, NJ 08902, USA at latitude: 404663628
longitude: -744820157

Feature called  at latitude: 407113723
longitude: -749746483

Feature called  at latitude: 402133926
longitude: -743613249

Feature called  at latitude: 400273442
longitude: -741220915

Feature called  at latitude: 411236786
longitude: -744070769

Feature called 211-225 Plains Road, Augusta, NJ 07822, USA at latitude: 411633782
longitude: -746784970

Feature called  at latitude: 415830701
longitude: -742952812

Feature called 165 Pedersen Ridge Road, Milford, PA 18337, USA at latitude: 413447164
longitude: -748712898

Feature called 100-122 Locktown Road, Frenchtown, NJ 08825, USA at latitude: 405047245
longitude: -749800722

Feature called  at latitude: 418858923
longitude: -746156790

Feature called 650-652 Willi Hill Road, Swan Lake, NY 12783, USA at latitude: 417951888
longitude: -748484944

Feature called 26 East 3rd Street, New Providence, NJ 07974, USA at latitude: 407033786
longitude: -743977337

Feature called  at latitude: 417548014
longitude: -740075041

Feature called  at latitude: 410395868
longitude: -744972325

Feature called  at latitude: 404615353
longitude: -745129803

Feature called 611 Lawrence Avenue, Westfield, NJ 07090, USA at latitude: 406589790
longitude: -743560121

Feature called 18 Lannis Avenue, New Windsor, NY 12553, USA at latitude: 414653148
longitude: -740477477

Feature called 82-104 Amherst Avenue, Colonia, NJ 07067, USA at latitude: 405957808
longitude: -743255336

Feature called 170 Seven Lakes Drive, Sloatsburg, NY 10974, USA at latitude: 411733589
longitude: -741648093

Feature called 1270 Lakes Road, Monroe, NY 10950, USA at latitude: 412676291
longitude: -742606606

Feature called 509-535 Alphano Road, Great Meadows, NJ 07838, USA at latitude: 409224445
longitude: -748286738

Feature called 652 Garden Street, Elizabeth, NJ 07202, USA at latitude: 406523420
longitude: -742135517

Feature called 349 Sea Spray Court, Neptune City, NJ 07753, USA at latitude: 401827388
longitude: -740294537

Feature called 13-17 Stanley Street, West Milford, NJ 07480, USA at latitude: 410564152
longitude: -743685054

Feature called 47 Industrial Avenue, Teterboro, NJ 07608, USA at latitude: 408472324
longitude: -740726046

Feature called 5 White Oak Lane, Stony Point, NY 10980, USA at latitude: 412452168
longitude: -740214052

Feature called Berkshire Valley Management Area Trail, Jefferson, NJ, USA at latitude: 409146138
longitude: -746188906

Feature called 1007 Jersey Avenue, New Brunswick, NJ 08901, USA at latitude: 404701380
longitude: -744781745

Feature called 6 East Emerald Isle Drive, Lake Hopatcong, NJ 07849, USA at latitude: 409642566
longitude: -746017679

Feature called 1358-1474 New Jersey 57, Port Murray, NJ 07865, USA at latitude: 408031728
longitude: -748645385

Feature called 367 Prospect Road, Chester, NY 10918, USA at latitude: 413700272
longitude: -742135189

Feature called 10 Simon Lake Drive, Atlantic Highlands, NJ 07716, USA at latitude: 404310607
longitude: -740282632

Feature called 11 Ward Street, Mount Arlington, NJ 07856, USA at latitude: 409319800
longitude: -746201391

Feature called 300-398 Jefferson Avenue, Elizabeth, NJ 07201, USA at latitude: 406685311
longitude: -742108603

Feature called 43 Dreher Road, Roscoe, NY 12776, USA at latitude: 419018117
longitude: -749142781

Feature called Swan Street, Pine Island, NY 10969, USA at latitude: 412856162
longitude: -745148837

Feature called 66 Pleasantview Avenue, Monticello, NY 12701, USA at latitude: 416560744
longitude: -746721964

Feature called  at latitude: 405314270
longitude: -749836354

Feature called  at latitude: 414219548
longitude: -743327440

Feature called 565 Winding Hills Road, Montgomery, NY 12549, USA at latitude: 415534177
longitude: -742900616

Feature called 231 Rocky Run Road, Glen Gardner, NJ 08826, USA at latitude: 406898530
longitude: -749127080

Feature called 100 Mount Pleasant Avenue, Newark, NJ 07104, USA at latitude: 407586880
longitude: -741670168

Feature called 517-521 Huntington Drive, Manchester Township, NJ 08759, USA at latitude: 400106455
longitude: -742870190

Feature called  at latitude: 400066188
longitude: -746793294

Feature called 40 Mountain Road, Napanoch, NY 12458, USA at latitude: 418803880
longitude: -744102673

Feature called  at latitude: 414204288
longitude: -747895140

Feature called  at latitude: 414777405
longitude: -740615601

Feature called 48 North Road, Forestburgh, NY 12777, USA at latitude: 415464475
longitude: -747175374

Feature called  at latitude: 404062378
longitude: -746376177

Feature called  at latitude: 405688272
longitude: -749285130

Feature called  at latitude: 400342070
longitude: -748788996

Feature called  at latitude: 401809022
longitude: -744157964

Feature called 9 Thompson Avenue, Leonardo, NJ 07737, USA at latitude: 404226644
longitude: -740517141

Feature called  at latitude: 410322033
longitude: -747871659

Feature called  at latitude: 407100674
longitude: -747742727

Feature called 213 Bush Road, Stone Ridge, NY 12484, USA at latitude: 418811433
longitude: -741718005

Feature called  at latitude: 415034302
longitude: -743850945

Feature called  at latitude: 411349992
longitude: -743694161

Feature called 1-17 Bergen Court, New Brunswick, NJ 08901, USA at latitude: 404839914
longitude: -744759616

Feature called 35 Oakland Valley Road, Cuddebackville, NY 12729, USA at latitude: 414638017
longitude: -745957854

Feature called  at latitude: 412127800
longitude: -740173578

Feature called  at latitude: 401263460
longitude: -747964303

Feature called  at latitude: 412843391
longitude: -749086026

Feature called  at latitude: 418512773
longitude: -743067823

Feature called 42-102 Main Street, Belford, NJ 07718, USA at latitude: 404318328
longitude: -740835638

Feature called  at latitude: 419020746
longitude: -741172328

Feature called  at latitude: 404080723
longitude: -746119569

Feature called  at latitude: 401012643
longitude: -744035134

Feature called  at latitude: 404306372
longitude: -741079661

Feature called  at latitude: 403966326
longitude: -748519297

Feature called  at latitude: 405002031
longitude: -748407866

Feature called  at latitude: 409532885
longitude: -742200683

Feature called  at latitude: 416851321
longitude: -742674555

Feature called 3387 Richmond Terrace, Staten Island, NY 10303, USA at latitude: 406411633
longitude: -741722051

Feature called 261 Van Sickle Road, Goshen, NY 10924, USA at latitude: 413069058
longitude: -744597778

Feature called  at latitude: 418465462
longitude: -746859398

Feature called  at latitude: 411733222
longitude: -744228360

Feature called 3 Hasta Way, Newton, NJ 07860, USA at latitude: 410248224
longitude: -747127767

-------------- RecordRoute --------------
Visiting point latitude: 414638017
longitude: -745957854

Visiting point latitude: 419018117
longitude: -749142781

Visiting point latitude: 410248224
longitude: -747127767

Visiting point latitude: 410248224
longitude: -747127767

Visiting point latitude: 405688272
longitude: -749285130

Visiting point latitude: 409532885
longitude: -742200683

Visiting point latitude: 419611318
longitude: -746524769

Visiting point latitude: 419611318
longitude: -746524769

Visiting point latitude: 404080723
longitude: -746119569

Visiting point latitude: 419611318
longitude: -746524769

Finished trip with 10 points 
Passed 10 features 
Travelled 744802 meters 
It took 0 seconds 
-------------- RouteChat --------------
Sending First message at 
Sending Second message at longitude: 1

Sending Third message at latitude: 1

Sending Fourth message at 
Sending Fifth message at latitude: 1

Received message First message at 
Received message Third message at latitude: 1
```

</details>

<details><summary>new output</summary>

```
-------------- GetFeature --------------
Feature called 'Berkshire Valley Management Area Trail, Jefferson, NJ, USA' at latitude: 409146138, longitude: -746188906
Found no feature at latitude: 0, longitude: 0
-------------- ListFeatures --------------
Looking for features between 40, -75 and 42, -73
Feature called 'Patriots Path, Mendham, NJ 07945, USA' at latitude: 407838351, longitude: -746143763
Feature called '101 New Jersey 10, Whippany, NJ 07981, USA' at latitude: 408122808, longitude: -743999179
Feature called 'U.S. 6, Shohola, PA 18458, USA' at latitude: 413628156, longitude: -749015468
Feature called '5 Conners Road, Kingston, NY 12401, USA' at latitude: 419999544, longitude: -740371136
Feature called 'Mid Hudson Psychiatric Center, New Hampton, NY 10958, USA' at latitude: 414008389, longitude: -743951297
Feature called '287 Flugertown Road, Livingston Manor, NY 12758, USA' at latitude: 419611318, longitude: -746524769
Feature called '4001 Tremley Point Road, Linden, NJ 07036, USA' at latitude: 406109563, longitude: -742186778
Feature called '352 South Mountain Road, Wallkill, NY 12589, USA' at latitude: 416802456, longitude: -742370183
Feature called 'Bailey Turn Road, Harriman, NY 10926, USA' at latitude: 412950425, longitude: -741077389
Feature called '193-199 Wawayanda Road, Hewitt, NJ 07421, USA' at latitude: 412144655, longitude: -743949739
Feature called '406-496 Ward Avenue, Pine Bush, NY 12566, USA' at latitude: 415736605, longitude: -742847522
Feature called '162 Merrill Road, Highland Mills, NY 10930, USA' at latitude: 413843930, longitude: -740501726
Feature called 'Clinton Road, West Milford, NJ 07480, USA' at latitude: 410873075, longitude: -744459023
Feature called '16 Old Brook Lane, Warwick, NY 10990, USA' at latitude: 412346009, longitude: -744026814
Feature called '3 Drake Lane, Pennington, NJ 08534, USA' at latitude: 402948455, longitude: -747903913
Feature called '6324 8th Avenue, Brooklyn, NY 11220, USA' at latitude: 406337092, longitude: -740122226
Feature called '1 Merck Access Road, Whitehouse Station, NJ 08889, USA' at latitude: 406421967, longitude: -747727624
Feature called '78-98 Schalck Road, Narrowsburg, NY 12764, USA' at latitude: 416318082, longitude: -749677716
Feature called '282 Lakeview Drive Road, Highland Lake, NY 12743, USA' at latitude: 415301720, longitude: -748416257
Feature called '330 Evelyn Avenue, Hamilton Township, NJ 08619, USA' at latitude: 402647019, longitude: -747071791
Feature called 'New York State Reference Route 987E, Southfields, NY 10975, USA' at latitude: 412567807, longitude: -741058078
Feature called '103-271 Tempaloni Road, Ellenville, NY 12428, USA' at latitude: 416855156, longitude: -744420597
Feature called '1300 Airport Road, North Brunswick Township, NJ 08902, USA' at latitude: 404663628, longitude: -744820157
Feature called '' at latitude: 407113723, longitude: -749746483
Feature called '' at latitude: 402133926, longitude: -743613249
Feature called '' at latitude: 400273442, longitude: -741220915
Feature called '' at latitude: 411236786, longitude: -744070769
Feature called '211-225 Plains Road, Augusta, NJ 07822, USA' at latitude: 411633782, longitude: -746784970
Feature called '' at latitude: 415830701, longitude: -742952812
Feature called '165 Pedersen Ridge Road, Milford, PA 18337, USA' at latitude: 413447164, longitude: -748712898
Feature called '100-122 Locktown Road, Frenchtown, NJ 08825, USA' at latitude: 405047245, longitude: -749800722
Feature called '' at latitude: 418858923, longitude: -746156790
Feature called '650-652 Willi Hill Road, Swan Lake, NY 12783, USA' at latitude: 417951888, longitude: -748484944
Feature called '26 East 3rd Street, New Providence, NJ 07974, USA' at latitude: 407033786, longitude: -743977337
Feature called '' at latitude: 417548014, longitude: -740075041
Feature called '' at latitude: 410395868, longitude: -744972325
Feature called '' at latitude: 404615353, longitude: -745129803
Feature called '611 Lawrence Avenue, Westfield, NJ 07090, USA' at latitude: 406589790, longitude: -743560121
Feature called '18 Lannis Avenue, New Windsor, NY 12553, USA' at latitude: 414653148, longitude: -740477477
Feature called '82-104 Amherst Avenue, Colonia, NJ 07067, USA' at latitude: 405957808, longitude: -743255336
Feature called '170 Seven Lakes Drive, Sloatsburg, NY 10974, USA' at latitude: 411733589, longitude: -741648093
Feature called '1270 Lakes Road, Monroe, NY 10950, USA' at latitude: 412676291, longitude: -742606606
Feature called '509-535 Alphano Road, Great Meadows, NJ 07838, USA' at latitude: 409224445, longitude: -748286738
Feature called '652 Garden Street, Elizabeth, NJ 07202, USA' at latitude: 406523420, longitude: -742135517
Feature called '349 Sea Spray Court, Neptune City, NJ 07753, USA' at latitude: 401827388, longitude: -740294537
Feature called '13-17 Stanley Street, West Milford, NJ 07480, USA' at latitude: 410564152, longitude: -743685054
Feature called '47 Industrial Avenue, Teterboro, NJ 07608, USA' at latitude: 408472324, longitude: -740726046
Feature called '5 White Oak Lane, Stony Point, NY 10980, USA' at latitude: 412452168, longitude: -740214052
Feature called 'Berkshire Valley Management Area Trail, Jefferson, NJ, USA' at latitude: 409146138, longitude: -746188906
Feature called '1007 Jersey Avenue, New Brunswick, NJ 08901, USA' at latitude: 404701380, longitude: -744781745
Feature called '6 East Emerald Isle Drive, Lake Hopatcong, NJ 07849, USA' at latitude: 409642566, longitude: -746017679
Feature called '1358-1474 New Jersey 57, Port Murray, NJ 07865, USA' at latitude: 408031728, longitude: -748645385
Feature called '367 Prospect Road, Chester, NY 10918, USA' at latitude: 413700272, longitude: -742135189
Feature called '10 Simon Lake Drive, Atlantic Highlands, NJ 07716, USA' at latitude: 404310607, longitude: -740282632
Feature called '11 Ward Street, Mount Arlington, NJ 07856, USA' at latitude: 409319800, longitude: -746201391
Feature called '300-398 Jefferson Avenue, Elizabeth, NJ 07201, USA' at latitude: 406685311, longitude: -742108603
Feature called '43 Dreher Road, Roscoe, NY 12776, USA' at latitude: 419018117, longitude: -749142781
Feature called 'Swan Street, Pine Island, NY 10969, USA' at latitude: 412856162, longitude: -745148837
Feature called '66 Pleasantview Avenue, Monticello, NY 12701, USA' at latitude: 416560744, longitude: -746721964
Feature called '' at latitude: 405314270, longitude: -749836354
Feature called '' at latitude: 414219548, longitude: -743327440
Feature called '565 Winding Hills Road, Montgomery, NY 12549, USA' at latitude: 415534177, longitude: -742900616
Feature called '231 Rocky Run Road, Glen Gardner, NJ 08826, USA' at latitude: 406898530, longitude: -749127080
Feature called '100 Mount Pleasant Avenue, Newark, NJ 07104, USA' at latitude: 407586880, longitude: -741670168
Feature called '517-521 Huntington Drive, Manchester Township, NJ 08759, USA' at latitude: 400106455, longitude: -742870190
Feature called '' at latitude: 400066188, longitude: -746793294
Feature called '40 Mountain Road, Napanoch, NY 12458, USA' at latitude: 418803880, longitude: -744102673
Feature called '' at latitude: 414204288, longitude: -747895140
Feature called '' at latitude: 414777405, longitude: -740615601
Feature called '48 North Road, Forestburgh, NY 12777, USA' at latitude: 415464475, longitude: -747175374
Feature called '' at latitude: 404062378, longitude: -746376177
Feature called '' at latitude: 405688272, longitude: -749285130
Feature called '' at latitude: 400342070, longitude: -748788996
Feature called '' at latitude: 401809022, longitude: -744157964
Feature called '9 Thompson Avenue, Leonardo, NJ 07737, USA' at latitude: 404226644, longitude: -740517141
Feature called '' at latitude: 410322033, longitude: -747871659
Feature called '' at latitude: 407100674, longitude: -747742727
Feature called '213 Bush Road, Stone Ridge, NY 12484, USA' at latitude: 418811433, longitude: -741718005
Feature called '' at latitude: 415034302, longitude: -743850945
Feature called '' at latitude: 411349992, longitude: -743694161
Feature called '1-17 Bergen Court, New Brunswick, NJ 08901, USA' at latitude: 404839914, longitude: -744759616
Feature called '35 Oakland Valley Road, Cuddebackville, NY 12729, USA' at latitude: 414638017, longitude: -745957854
Feature called '' at latitude: 412127800, longitude: -740173578
Feature called '' at latitude: 401263460, longitude: -747964303
Feature called '' at latitude: 412843391, longitude: -749086026
Feature called '' at latitude: 418512773, longitude: -743067823
Feature called '42-102 Main Street, Belford, NJ 07718, USA' at latitude: 404318328, longitude: -740835638
Feature called '' at latitude: 419020746, longitude: -741172328
Feature called '' at latitude: 404080723, longitude: -746119569
Feature called '' at latitude: 401012643, longitude: -744035134
Feature called '' at latitude: 404306372, longitude: -741079661
Feature called '' at latitude: 403966326, longitude: -748519297
Feature called '' at latitude: 405002031, longitude: -748407866
Feature called '' at latitude: 409532885, longitude: -742200683
Feature called '' at latitude: 416851321, longitude: -742674555
Feature called '3387 Richmond Terrace, Staten Island, NY 10303, USA' at latitude: 406411633, longitude: -741722051
Feature called '261 Van Sickle Road, Goshen, NY 10924, USA' at latitude: 413069058, longitude: -744597778
Feature called '' at latitude: 418465462, longitude: -746859398
Feature called '' at latitude: 411733222, longitude: -744228360
Feature called '3 Hasta Way, Newton, NJ 07860, USA' at latitude: 410248224, longitude: -747127767
-------------- RecordRoute --------------
Visiting point latitude: 411733222, longitude: -744228360
Visiting point latitude: 419018117, longitude: -749142781
Visiting point latitude: 414638017, longitude: -745957854
Visiting point latitude: 407586880, longitude: -741670168
Visiting point latitude: 412676291, longitude: -742606606
Visiting point latitude: 416851321, longitude: -742674555
Visiting point latitude: 406685311, longitude: -742108603
Visiting point latitude: 418803880, longitude: -744102673
Visiting point latitude: 415301720, longitude: -748416257
Visiting point latitude: 415301720, longitude: -748416257
Finished trip with 10 points 
Passed 10 features 
Travelled 637794 meters 
It took 0 seconds 
-------------- RouteChat --------------
Sending First message at latitude: 0, longitude: 0
Sending Second message at latitude: 0, longitude: 1
Sending Third message at latitude: 1, longitude: 0
Sending Fourth message at latitude: 0, longitude: 0
Sending Fifth message at latitude: 1, longitude: 0
Received message First message at latitude: 0, longitude: 0
Received message Third message at latitude: 1, longitude: 0

```

</details>

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examples/python/route_guide/route_guide_client.py

@@ -31,6 +31,12 @@ def make_route_note(message, latitude, longitude):
     )
 
 
+def format_point(point):
+    # not delegating in point.__str__ because it is an empty string when its
+    # values are zero. In addition, it puts a newline between the fields.
+    return "latitude: %d, longitude: %d" % (point.latitude, point.longitude)
+
+
 def guide_get_one_feature(stub, point):
     feature = stub.GetFeature(point)
     if not feature.location:
@@ -38,9 +44,12 @@ def guide_get_one_feature(stub, point):
         return
 
     if feature.name:
-        print("Feature called %s at %s" % (feature.name, feature.location))
+        print(
+            "Feature called %r at %s"
+            % (feature.name, format_point(feature.location))
+        )
     else:
-        print("Found no feature at %s" % feature.location)
+        print("Found no feature at %s" % format_point(feature.location))
 
 
 def guide_get_feature(stub):
@@ -60,13 +69,16 @@ def guide_list_features(stub):
     features = stub.ListFeatures(rectangle)
 
     for feature in features:
-        print("Feature called %s at %s" % (feature.name, feature.location))
+        print(
+            "Feature called %r at %s"
+            % (feature.name, format_point(feature.location))
+        )
 
 
 def generate_route(feature_list):
     for _ in range(0, 10):
-        random_feature = feature_list[random.randint(0, len(feature_list) - 1)]
-        print("Visiting point %s" % random_feature.location)
+        random_feature = random.choice(feature_list)
+        print("Visiting point %s" % format_point(random_feature.location))
         yield random_feature.location
 
 
@@ -90,7 +102,7 @@ def generate_messages():
         make_route_note("Fifth message", 1, 0),
     ]
     for msg in messages:
-        print("Sending %s at %s" % (msg.message, msg.location))
+        print("Sending %s at %s" % (msg.message, format_point(msg.location)))
         yield msg
 
 
@@ -98,7 +110,8 @@ def guide_route_chat(stub):
     responses = stub.RouteChat(generate_messages())
     for response in responses:
         print(
-            "Received message %s at %s" % (response.message, response.location)
+            "Received message %s at %s"
+            % (response.message, format_point(response.location))
         )