Beginner · ages 9+ · functions · return · formatting

Temperature converter in Python.

Turn Celsius into Fahrenheit and print a conversion table.

The program

Press Run to see what it prints. Change anything you like, then run it again.

def to_fahrenheit(c):
    return c * 9 / 5 + 32

for c in range(0, 101, 20):
    print(f"{c} C = {to_fahrenheit(c):.1f} F")

0 C = 32.0 F
20 C = 68.0 F
40 C = 104.0 F
60 C = 140.0 F
80 C = 176.0 F
100 C = 212.0 F

A function is a named recipe. def defines it and return sends back the answer.
range(0, 101, 20) counts in steps of 20.
:.1f inside an f-string means 'show one decimal place'.

Stuck on an error? Read how to debug Python.

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FAQ

What does the temperature converter program do?

Turn Celsius into Fahrenheit and print a conversion table. It prints: 0 C = 32.0 F / 20 C = 68.0 F / 40 C = 104.0 F …

Which Python ideas does it use?

functions, return, formatting. Beginner level, suitable from about age 9.

How do I run it?

Press Run on this page. To run it on your own computer, install Python 3 and save the code in a file ending in .py. It prints the same thing.

What should I try next?

Write a function that turns Fahrenheit back into Celsius. Print every 10 degrees. Find the temperature where both scales give the same number.

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