Class 11 Computer Science — Chapter 9: LISTS

What you'll learn

• ▸Fundamentals of Python Lists
• ▸Accessing List Elements by Index
• ▸List Mutability
• ▸List Operations
• ▸List Slicing
• ▸Traversing a List
• ▸List Methods and Built-in Functions
• ▸Nested Lists

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 an 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) [['P…

Practice Questions from this Chapter

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1. Show me real-world list examples. Get Solution →
2. Change a list element for me. Get Solution →
3. Compare lists to strings simply. Get Solution →
4. How are the elements of a Python list enclosed? Get Solution →
5. According to the chapter, what is the primary characteristic of a list regarding its modifiability? Get Solution →
6. Can a Python list contain elements of different data types? Get Solution →
7. What is the index of the very first element in any Python list? Get Solution →
8. Which operator is used for list concatenation? Get Solution →

Did you know?

• 💡 Ancient Sumerians used clay tablets to list goods and transactions thousands of years ago.
• 💡 The internet uses hidden lists called 'routers' to direct information around the world.
• 💡 Our DNA is like a super-long list of instructions for building a human body.
• 💡 The first known shopping list was found on a 3,000-year-old Egyptian papyrus.
• 💡 Libraries use special 'Dewey Decimal' lists to organize every book by number.

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