Restyle and run python script in unbuffered mode

Author: shaoltan-amazon

.github/workflows/examples-linux-tv-casting-app.yaml

@@ -77,7 +77,7 @@ jobs:
                   Commissioner Generated Passcode
               run: |
                   ./scripts/run_in_build_env.sh \
-                    "python3 ./scripts/tests/run_tv_casting_test.py --commissioner-generated-passcode=True"
+                    "python3 -u ./scripts/tests/run_tv_casting_test.py --commissioner-generated-passcode=True"
               timeout-minutes: 2 # Comment this out to debug if GitHub Action times out.
 
             - name: Uploading Size Reports

scripts/tests/linux/log_line_processing.py

@@ -127,7 +127,7 @@ def next_output_line(self, timeout_sec=None):
             remaining_time = end_time - time.time()
             if remaining_time <= 0:
                 return None
-                
+
             if not self.output_lines.empty():
                 return self.output_lines.get_nowait()
             else: