Python Tutorial: How to Identify Prime Numbers With a Simple Function

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A tutorial published on DEV Community walks beginners through writing a Python program to detect prime numbers. A prime number is defined as one divisible only by 1 and itself, with examples including 2, 3, 5, and 7. The guide demonstrates a function that loops through potential divisors and uses the modulo operator to test divisibility. The sample code checks all integers from 10 to 20, correctly identifying 11, 13, 17, and 19 as primes. The exercise is presented as a practical way for new programmers to practise functions, loops, conditionals, and return statements.

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