Class 11 Computer Science — Chapter 9: LISTS

What you'll learn

• ▸List Fundamentals and Creation
• ▸Accessing List Elements via Indexing
• ▸List Mutability
• ▸List Operations: Concatenation and Repetition
• ▸List Membership Testing
• ▸List Slicing
• ▸Traversing a List
• ▸Modifying Lists with Methods
• ▸List Querying and Creation Functions

Chapter Summary

--- PAGE 1 --- CHAPTER 9 LISTS 9.1 INTRODUCTION TO LIST The data type list is an ordered sequence which is mutable and made up of one or more elements. Unlike a string which consists of only characters, a list can have elements of different data types, such as integer, float, string, tuple or even another list. A list is very useful to group together elements of mixed data types. Elements of a list are enclosed in square brackets and are separated by comma. Like string indices, list indices also start from 0. Example 9.1 #list1 is the list of six even numbers >>> list1 = [2,4,6,8,10,12] >>> print(list1) [2, 4, 6, 8, 10, 12] #list2 is the list of vowels >>> list2 = ['a','e','i','o','u'] >>> print(list2) ['a', 'e', 'i', 'o', 'u'] #list3 is the list of mixed data types >>> list3 = [100,23.5,'Hello'] >>> print(list3) [100, 23.5, 'Hello'] #list4 is the list of lists called nested #list >>> list4 =[['Physics',101],['Chemistry',202], ['Maths',303]] >>> print(list4) [['Phys…

Practice Questions from this Chapter

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1. Give a real-world list example. Get Solution →
2. Show other list operations. Get Solution →
3. Create a simple list program. Get Solution →
4. According to the text, which of the following best describes a Python list? Get Solution →
5. How are the elements of a list enclosed in Python syntax? Get Solution →
6. What is the index of the first element in a Python list? Get Solution →
7. Which operator is used for list concatenation to join two lists? Get Solution →
8. Which operator is used to replicate the elements of a list multiple times? Get Solution →

Did you know?

• 💡 Your DNA is a long list of chemical instructions that builds your entire body.
• 💡 Ancient libraries organized millions of scrolls and books into precise lists by subject.
• 💡 Every webpage you visit is built from lists of code and content elements.
• 💡 Computer memory stores all information as ordered lists of ones and zeros.
• 💡 Some ant colonies create complex 'to-do lists' using chemical trails to organize tasks.

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