Python Introduction Examples
Short, runnable programs that show what is python? in action. Read the explanation, press Run, then change the code and try your own ideas. New to the topic? Start with the What Is Python? lesson.
1Hello, world
The traditional first program: one line, one function call.
print("Hello, world!")
print("Python is running in your browser.")Expected outputHello, world!
Python is running in your browser.
2Python as a calculator
Arithmetic works directly inside print(), which is handy for checking a quick sum.
price = 19.99
quantity = 3
print(price * quantity)
print(round(price * quantity, 2))
print(100 - 15)
print(2 ** 8)Expected output59.97
59.97
85
256
3Repeating work with a loop
A loop does the same job for every item, so ten items cost the same effort as three.
tasks = ["wash dishes", "buy milk", "call Asha"]
for number, task in enumerate(tasks, start=1):
print(number, "-", task)Expected output1 - wash dishes
2 - buy milk
3 - call Asha
4Converting units
A small script that saves you from doing repeated conversions by hand.
kilometres = 42.195
miles = kilometres * 0.621371
print("Marathon:", kilometres, "km")
print("That is about", round(miles, 1), "miles")Expected outputMarathon: 42.195 km
That is about 26.2 miles
5Text can be calculated too
Strings can be joined with + and repeated with *, so Python is not only about numbers.
title = "Python"
print("I am learning " + title)
print("ha" * 3)
print(len(title))Expected outputI am learning Python
hahaha
6
6A decision in three lines
Programs can choose what to do. This preview of if shows how readable Python stays.
temperature = 31
if temperature > 30:
print("It is hot, drink water.")
else:
print("Nice weather.")Expected outputIt is hot, drink water.
Practise next
What Is Python? exercises → Back to the lesson
Python Syntax examplesPython Variables examplesPython Input and Output examples