Python: Adding To and Changing Lists

  1. Introduction to Python
  2. Python: Choosing a Text Editor or IDE
  3. Python: Hello World
  4. Python: Variables, Strings and Numbers
  5. Python: Variable Naming
  6. Python: Math, Familiar
  7. Python: Math, Less Familiar
  8. Python: Mathematical Order of Operations
  9. Python: Introducing PEP 8
  10. Python: Text Concatenation
  11. Python: if Statements and Comparison Operators
  12. Python: else and elif statements
  13. Python: Testing Multiple Conditions
  14. Python: Testing Sets of Conditions
  15. Python: Nested if Statements
  16. Python: Lists
  17. Python: Adding To and Changing Lists
  18. Python: Lists: Take a Slice, Delete Elements, Popping Elements
  19. Python: Tuples
  20. Python: for Loops
  21. Python: Nested for Loops
  22. Python: Capturing and Formatting User Input
  23. Python: Dictionaries
  24. Python: Functions
  25. Python: While Loops
  26. Python: Data Files
  27. Python: Using Pexpect
  28. Python : Using Pexpect :
  29. Python : Using Pexpect:
  30. Python: DCL Conversion to Python

Go to Chapter 16 of A Smarter Way.

Return to our lists page:

Change an item in a list:

friends = ['bill', 'jeff', 'jim']

friends[0] = 'fred'

Add an item to a list:

# Note that we use parens, not brackets!
# That's because this is a function.

Find the index of an element:


Is an item in a list?

print('joel' in friends)
print('fanny' in friends)

If an item isn’t in the list, in the example above, of course nothing prints.

The Critical Difference Between sorted( ) and sort( )

…and once again, scroll up because the page TOC is faulty.

sort( ) actually reorders the values in the list. The list, in other words, is changed.

sorted( ) does NOT change the list, it just returns a sorted version of the list to you.




  1. Continue editing
  2. Change the value of one item in your list.
  3. Find the index of one item by name.
  4. Perform a test to see if an item is in your list.