No. 851Ages 11 to 14
Your First Program
How print() puts words on the screen, taken apart piece by piece, with a first program, its output and predict-the-result practice.
No. 852Ages 11 to 14
Variables
Named boxes that store values, the difference between assign and equals, the naming rules, and four trace-the-value questions.
No. 853Ages 11 to 14
Input and Output
Reading what the user types with input() and why it always comes back as text, plus converting with int() to do maths.
No. 854Ages 11 to 14
Data Types
The four types you meet first, int, float, str and bool, with a casting table and why 42 and "42" are not the same thing.
No. 855Ages 11 to 14
If Statements
Selection with if, elif and else, the comparison operators, and how indentation decides what belongs to each branch.
No. 856Ages 11 to 14
For Loops
Repeating a set number of times with for and range(), a worked total, and how to read range() including its step.
No. 857Ages 11 to 14
While Loops
Repeating while a condition holds, when to choose while over for, and the infinite loop that a missing update creates.
No. 858Ages 11 to 14
Lists
Storing many values in order, why indexes start at zero, and the everyday operations len, append and negative indexing.
No. 859Ages 11 to 14
Functions
Defining reusable blocks with def, passing values in through parameters, and handing a result back with return.
Type or write inNo. 860Ages 11 to 14
Debugging and Trace Tables
Run code by hand in a trace table to see exactly what it does, with a worked example, a write-in table and a full answer key.