Week 07 | Notion

<aside> ℹ️ The focus of this tutorial is scripting in Python!

</aside>

📚 Introduction to the Python environment

So far, in shell, we have been using the hashbang #!/bin/dash, how should we modify this to use it with Python?
What version of Python should be used in this course? What are the differences between different versions?
Where can I find the Python3 documentation?
What is a REPL? How do you start the python REPL?
In Python, you can imitate a main function by using the if __name__ == '__main__': construct. How does this work? Why is this useful?

Write a simple version of the head command in Python, that accepts an optional command line argument in the form -n, where n is a number, and displays the first n lines from its standard input. If the -n option is not used, then the program simply displays the first ten lines from its standard input.
Modify the head program from the previous question so that, as well as handling an optional -n argument to specify how many lines, it also handles multiple files on the command line and displays the first n lines from each file, separating them by a line of the form ==> FileName <===.