Beginner Python Cheat Sheet - Functions (Python Crash Course)

Question 1

How do you make an argument in an argument optional?

Answer 1

Use None.

E.g.
def describe_pet(animal, name=None):
 """Display information about a pet."""
 print("\nI have a " + animal + ".")
 if name:
 print("Its name is " + name + ".")

Question 2

Can you pass a list to a function without having to “unpack” the list?

Answer 2

Yes

Question 3

What’s an easy way to pass a list as a copy to a function?

Answer 3

Use brackets with a colon after the list to select all items
E.g.
print_models(original[:], printed)

Question 4

How do you create a module for use in your code?

Answer 4

Create the function and store it in a script. Store that script in the same directory and then call it like a normal module. Use the same name as the name of the .py script file