Find the largest of three numbers in Python

Python's built-in max() does this in one call. Writing the comparisons yourself is good practice, so this page shows both.

The program

a, b, c = 10, 25, 18

print("Largest:", max(a, b, c))

Largest: 25

The same thing with if and elif

a, b, c = 10, 25, 18

if a >= b and a >= c:
    largest = a
elif b >= a and b >= c:
    largest = b
else:
    largest = c

print("Largest:", largest)

Largest: 25

How it works

• max() accepts any number of values and returns the biggest. min() returns the smallest.
• In the second version, and means both comparisons must be true. If a is at least as big as both others, it is the largest.
• >= (not >) makes the program work when two numbers are equal: with 25, 25, 18 it still finds 25.