Chapter 3.1 - Exercise

Getting help

Python has a builtin help system which describes and explains things: In an interactive python session you can use help() on almost anything to display a help page:

help(len)
Help on built-in function len in module builtins:

len(obj, /)
    Return the number of items in a container.

Note: The help page is opened using the less command. Refer to chapter 1.2 if you are unsure about how to navigate it (hint: Try the cursor keys and "q").

Planets

Copy this into an interactive python session:

planets = ["Mercury", "Vinus", "Mars", "Earth", "Saturn"]

Fix the planet name

"Vinus" has a typo in it and should be called "Venus". Fix this by replacing the element.

Sort the planets

Your objective is to sort the list of planets alphabetically and print it to the terminal.

Hint: The list of planets might have a function for that. Use the builtin help, to figure out how to do that.

Reverse the planets

Print the list of planets in reverse order.

Remove planets

Remove the one planet from the list, where humans, as of 2023, already have set foot on.

Length of a string

How long is the string "The quick brown fox jumps over the lazy dog"?

Next chapter

Coming right up: chapter 3.2 which explains loops and contains.