December 2018
Beginner to intermediate
796 pages
19h 54m
English
Content preview from Learn Web Development with Python
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A prime generator
According to Wikipedia:
A prime number (or a prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. A natural number greater than 1 that is not a prime number is called a composite number.
Based on this definition, if we consider the first 10 natural numbers, we can see that 2, 3, 5, and 7 are primes, while 1, 4, 6, 8, 9, and 10 are not. In order to have a computer tell you whether a number, N, is prime, you can divide that number by all natural numbers in the range [2, N). If any of those divisions yields zero as a remainder, then the number is not a prime. Enough chatter, let's get down to business. I'll write two versions of this, the second of which will exploit the for...else ...
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