From 13fbc0941db96e5a602c90fe767417bfb71d9462 Mon Sep 17 00:00:00 2001
From: Jan Lerking <jan.lerking@gmail.com>
Date: Sun, 22 Sep 2024 19:36:41 +0200
Subject: [PATCH] if __name__ lesson. /JL

---
 lesson_1/hello_world.py           |  8 ++++++++
 lesson_1/launching_python_file.py | 25 +++++++++++++++++++++++++
 2 files changed, 33 insertions(+)
 create mode 100644 lesson_1/hello_world.py
 create mode 100644 lesson_1/launching_python_file.py

diff --git a/lesson_1/hello_world.py b/lesson_1/hello_world.py
new file mode 100644
index 0000000..f2f45c1
--- /dev/null
+++ b/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()
\ No newline at end of file
diff --git a/lesson_1/launching_python_file.py b/lesson_1/launching_python_file.py
new file mode 100644
index 0000000..457d664
--- /dev/null
+++ b/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. 
\ No newline at end of file