Fix automating build workflow for Python

.github/workflows/python.yml

@@ -32,7 +32,6 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           pip install black
-          if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
       - name: Lint with black
         run: |
           black codes/python

codes/python/build.py

@@ -1,10 +1,13 @@
 import glob
 import py_compile as pyc
 
+if __name__ == "__main__":
+    # find source code files
     src_paths = sorted(glob.glob("codes/python/**/*.py"))
     num_src = len(src_paths)
     num_src_error = 0
 
+    # compile python code
     for src_path in src_paths:
         try:
             pyc.compile(src_path, doraise=True)
@@ -12,6 +15,6 @@ for src_path in src_paths:
             num_src_error += 1
             print(e)
 
-print(f"===== Build Summary =====")
+    print(f"===== Build Complete =====")
     print(f"Total: {num_src}")
-print(f"Error: {num_src - num_src_error}")
+    print(f"Error: {num_src_error}")