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1. PART 10
FUNCTIONS IN PYTHON
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2. DEFINING AND CALLING A FUNCTION IN
PYTHON

3. WHY TO USE FUNCTIONS ?
• Reusability – finding greater of two numbers
• Avoiding repetitive code
• Users do not need to know how function is working

4. USER DEFINED VS BUILT-IN FUNCTIONS
• print(), len(), sort() – built-in

5. PASSING INFORMATION TO A FUNCTION
Multiple calls

6. FUNCTION PARAMETERS AND ARGUMENTS
• Parameters -> Function definition inputs
• Arguments -> Function call inputs
• Used interchangeably

7. PASSING ARGUMENTS TO FUNCTIONS
• A function can have multiple parameters
• A function call may need multiple arguments
• Positional arguments
• Keyword arguments

8. POSITIONAL ARGUMENTS
• Interchange the arguments
• Increase/Decrease the number of arguments

9. KEYWORD ARGUMENTS
• Interchange
• Wrong keyword

10. DEFAULT VALUES
• One can define default values for each function parameter
• If an argument for a parameter is not passed, default value is used

12. DIFFERENT WAYS OF CALLING A FUNCTION

13. RETURN VALUES
• A function doesn’t always have to display the output
• It can also return value back to the function call
• return statement is used

15. Return a dictionary
Return a list

16. USING A FUNCTION
WITH WHILE LOOP

18. PASSING A LIST TO A FUNCTION

19. MODIFYING A LIST IN A FUNCTION

20. PREVENTING A FUNCTION
FROM MODIFYING A LIST

21. MODIFYING A DICTIONARY
IN A FUNCTION

22. WRITING PROGRAMS
USING PYTHON