Computer Science

a file with pre-made code you can use in your own programs

a collection of built-in modules that come with Python

Randomisation

While loops

Using trace tables

For loops

Nested loops

Validating data input in a program

Designing robust programs

Programming project: iteration I

Programming project: iteration II

In this unit pupils discover how iteration is used to replicate parts of a program. They will analyse the difference between count and condition controlled iteration and how trace tables can be used to trace through loops. They will explore data validation techniques and robust program design.

Programming: iteration

Yes, Python doesn’t have built-in functions.

No, Python’s standard library includes the random module.

No, but you have to create your own module.

Do you need to write all the code for random number generation yourself?

a file with pre-made code you can use in your programs

How do you generate a random whole number between 1 and 10?

selects a random item from a list or string

controls how many times the inner loop repeats

What does the outer loop in a nested loop do?

it runs completely for each outer loop iteration

How does the inner loop behave in a nested loop?

they allow repetitive tasks within repetitive tasks

What is the main advantage of using nested loops?

How do you ensure a nested loop works correctly?

How many times will this print a line?
```for day in range(3):
    for hour in range(2):
        print("Time slot")```

Starter Quiz

What is a nested loop?