Python course / Foundations

Values and variables

Write your first working programs: show a value, store one under a name, and move between text and numbers. Most early bugs are a number that is secretly text, and this is where you learn to tell them apart.

printing
strings
numbers
variables
types
f-strings
slicing
input()

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text, numbers and the line between them

price = "3.50"
count = 4

total = float(price) * count
label = "tea"

print(f"{count} x {label}: {total:.2f}")
print(label.upper(), label[0], label[1:])

4 x tea: 14.00
TEA t ea

What you will learn

Make the program say something.
Use Python as a calculator.
Store a value under a name and reuse it.
Turn text into numbers and back.
Build readable text from values.
Take a section out of a string.

The lessons in this module

Printing output
Text values
Numbers and arithmetic
Variables
Changing a variable
Types
Converting between types
f-strings
String methods
Reaching into a string
Slicing
Reading input
Comments and layout
Module review: unit converter

Ready when you are

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Next: Conditions and branching. All modules are on the course page.