Loops: for
for i in range(5):
print("Lap", i)Prints Lap 0 to Lap 4. range(5) gives 0, 1, 2, 3, 4: it starts at 0 and stops before 5.
e.g.Example
Scratch: 'repeat 5'.
for, range and random
PracticalPresent ▶
What this lesson covers
Topic 13 Programming basics
KS3 Computing · A program stores information in variables, works on it with operators, and controls the order with sequence, selection and iteration. Examples are in Python, with Scratch alongside for Year 7.
ProgrammingCambridge Lower Secondary Computing 0860
You will learn to
- Use for and range() to repeat code a set number of times.
- Explain why range(5) gives 0, 1, 2, 3 and 4, and stops before 5.
- Use import random and random.randint() to make a dice program.
- Create a times table program in four lines or fewer.
Success criteria
- I can predict the numbers that range(5) and range(1, 11) give.
- I can make a dice that gives a random whole number from 1 to 6.
- I can print a times table with a for loop.
- I can say when to use for and when to use while.
Key words
Say each word, then read what it means. Every one is in the glossary too.
- Variable
- A named place in memory that holds a value.
- Assignment
- Storing a value in a variable. = in Python, ← in pseudocode.
- Casting
- Changing a value from one data type to another, like int("13").
- Concatenation
- Joining strings together: "7" + "7" = "77".
- Selection
- Choosing a path with if / else.
- Iteration
- Repeating steps: a loop.
- Boolean
- A value that is only True or False.
- Infinite loop
- A loop whose condition never becomes false.
The explanation
Read it here, or open the study page below to go one step at a time with things to try.
Study it
Open the study page and go one step at a time.
Check yourself
One question at a time. The reason shows after each answer.
Saved on this device.