if __name__ lesson. /JL

lesson_1/hello_world.py

@@ -0,0 +1,8 @@
+import os
+
+def main() -> None:
+    print("Hello world!")
+    print("From: ", os.getcwd())
+    
+if __name__ == "__main__":
+    main()

lesson_1/launching_python_file.py

@@ -0,0 +1,25 @@
+"""
+How to launch a python script, the right way
+"""
+
+# This is a very short introduction into the correct way of launching a python script.
+# There's only 1 correct way of doing this, shown below.
+
+import os
+
+def main() -> None:
+    print("Hello world!")
+    
+if __name__ == "__main__":
+    main()
+    
+# In short a python script can be devided in 3 parts.
+# Imports, definitions, directly executable.
+# Only your main file should contain these 3 parts/sections. Any imported file should only contain the first 2
+# parts. This prevents you from running a file that's only supposed to be imported, directly from terminal.
+# Your main file must follow this setup. Failing to do so, will give you issues further down the path.
+
+# The overall purpose of this setup is that the file you execute with python, is called "__main__" and
+# any other files is called by their import name.
+
+# Any code definitions are not executed until you actually call the function/method.