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Python videos | Python Part 3 - Ranges, loops and formatting

Posted by Andy Brown on 05 September 2021

Python Part 3 - Ranges, loops and formatting

This video explains how to create loops which execute while a particular condition is true (and how to break out of these loops), how to print messages more neatly and how to use ranges to loop over sequences of numbers.

See our full range of Python training resources, or test your knowledge of Python with one of our Python skills assessment tests.

This video has the following accompanying files:

File name	Type	Description
List even squares.py	Python code	Using a while loop to list out the first N even squares
Fizz buzz.py	Python code	Listing out the first N numbers divisible by 3
Greet pets.py	Python code	Using variables when printing to greet cats by name
List math terms.py	Python code	Listing out cubes and reciprocals nicely formatted
Range syntax.py	Python code	Syntax of range with one to three arguments
Range example.py	Python code	Using range to list out the first N cubes
Prime numbers.py	Python code	Nested ranges listing out prime numbers

Click to download a zipped copy of the above files.

After watching this video, you may like to test your understanding by doing one or more of the following exercises:

Exercise	Level
Use the range and format functions to loop down from 10 to 1 displaying a countdown message	Easy
Use the range and format functions to list the square roots of the first 100 integers	Standard
Use the range function in an outer loop to find all the primes up to 100 using an inner loop	Hard
Print out ever-more-accurate estimates of the value of pi using the Leibniz series	Hard

You can also download the answers to each exercise from the links above.

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From:	Surendra7
When:	19 Dec 21 at 16:00

Reply to Surendra7

Does changing the range for prime test to

for possible_prime in range(2,int(test_number/2)):

will make code more effiecient.

From:	Andy B
When:	20 Dec 21 at 09:27

Reply to Andy B

The algorithm given is to teach Python, and doesn't claim to be efficient. A simple improvement would be to test from 2 up to the square root of the possible prime, rather than half of it, on the grounds that two factors of a prime can't both be greater than its square root, otherwise when you multiplied them together you'd get a number greater than the prime. There are many better tests for primeness than this, though.

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