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- Python Part 1 - Getting started with Python
- Python Part 2 - Installing and customising Visual Studio Code
- Python Part 3 - Ranges, loops and formatting
- Python Part 4 - Virtual Environments
- Python Part 5 - Modules
- Python Part 6 - Debugging
- Python Part 7a - Sequences: iterating using for loops
- Python Part 7b - Sequences: slicing
- Python Part 7c - Sequences: other techniques
- Python Part 8 - List Comprehensions
- Python Part 9 - Files and Folders
- Python Part 10 - Sets
- Python Part 11 - Dictionaries
- Python Part 12a - Functions
- Python Part 12b - Advanced Functions
- Python Part 13 - Error-trapping
- Python Part 14a - Working with numbers
- Python Part 14b - Working with Booleans
- Python Part 14c - Working with dates/times
- Python Part 14d - Working with strings
- Python Part 15 - Scraping websites
- Python Part 16a - Linking to SQL Server
- Python Part 16b - Linking to CSV files
- Python Part 16c - Linking to JSON files
- Python Part 17a- Excel using openpyxl
- Python Part 17b - VBA using pywin32
- Python Part 18 - NumPy
- Python Part 19 - Pandas
- Python Part 20 - Working with Power BI Desktop
- Python Part 21a - Programming using classes
- Python Part 21b - Case study on classes (hangman)
Python videos | Python Part 3 - Ranges, loops and formatting
Posted by Andy Brown on 05 September 2021
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.
This video has the following accompanying files:
|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:
You can also download the answers to each exercise from the links above.
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Does changing the range for prime test to
for possible_prime in range(2,int(test_number/2)):
will make code more effiecient.
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.