7. Lists

Introduction to Python

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1. Introduction

2. Numbers in Python

3. Text in Python

4. Making Comparisons

5. Making Choices

6. Exercise: Paper, Scissors, Stone game

7. Lists

8. Loops

9. Simple Web Crawler

7. Lists

So far we have used variables to store a single value. Sometimes it is useful to store multiple values into a single variable using a list.
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name_list = ["mary", "john", "paul"]
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len(name_list)
3
>> 3
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You can add an item into a list using the append function
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name_list.append("eric")
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name_list
3
>>  ['mary', 'john', 'paul','eric']
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len(name_list)
5
>> 4
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Items in a list can be retrieved as follows:
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name_list[0]    
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>> 'mary'
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​
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name_list[3]    
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>> 'eric'
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​
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name_list[0:2]    #this retreives the first three elements (0, 1, 2) from the list
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>> ['mary', 'john', 'paul']
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Python considers the first item in a list to be item 0 (zero), second item to be item 1, and so on.
You can also perform different functions on a list, such as sorting, and finding maximum, minimum and length (number of items):
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name_list = ["mary", "john", "paul","eric"]
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name_list.sort()
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name_list
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>> ['eric','john','mary','paul']
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​
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num_list = [334,23,1,54]
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max(num_list)
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>> 334
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min(num_list)
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>> 1
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len(num_list)
12
>> 4
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6. Exercise: Paper, Scissors, Stone game

8. Loops

Last modified 3yr ago

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