Jedzej/lesson 00 the setup

students/uss_tomasz/lesson_00_the_setup/hello_world.py

@@ -0,0 +1,31 @@
+#!/usr/bin/env python3
+
+"""This is an example module to teach you about git and PyCharm use.
+
+Python supports many ways to write programs. You can start with a very simple
+imperative code, like this script.
+"""
+
+print("Hello world!")
+
+#!/usr/bin/env python3
+
+"""The `hello_world.py` approach is good for simple scripts, where the code is
+unlikely to be reused.
+
+As soon as you want to import and use your code from other modules, you want
+to make sure it runs only when asked to. To do that we check magic variable
+__name__, set by the interpreter. If the script has been called directly,
+the variable holds '__main__' string.
+"""
+
+
+def main():
+    print('Hello world!')
+
+
+if __name__ == '__main__':
+    # `python hello_world.py` will run main(), `import hello_world` will not
+    main()
+
+# `import hello_world` will still allow me to run `hello_world.main()`