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Posted by Andy Brown on 13 October 2021
Iterating sequences has a good claim to be the most important topic in Python. This tutorial shows the four types of sequences (tuples, lists, ranges and strings), explains how to loop over them and gives 4 practical examples of their use.
This video has the following accompanying files:
|Lists and tuples.py||Python code||Creating lists and tuples|
|Ranges and strings.py||Python code||Ranges and strings as sequences|
|Looping over sequences.py||Python code||Looping over different types of sequence|
|Example 1 - listing files.py||Python code||Case study 1 - listing files in folder|
|Example 2 - listing words.py||Python code||Case study 2 - listing words in quotation|
|Example 3 - listing module names.py||Python code||Case study 3 - listing built-in module names|
|Example 4 - listing hyperlinks.py||Python code||Case study 4 - listing web page hyperlinks|
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:
|Use a list to store items in a shopping list, print them out and change one||Easy|
|Loop over the items in a range which are divisible by one number but not another||Standard|
|Create a list of all of the words in a speech, and loop over it printing certain ones||Standard|
You can also download the answers to each exercise from the links above.
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