Functions

Topics in this chapter

• Function Definition and Basic Calling
• Parameters and Argument Passing Types
• Return Values and Variable Scope
• User-Defined Functions and Problem Solving
• Recursion and Recursive Functions

Cheat sheet

Practice questions

1. Question 1Q-92F0B2

   What is the output of the following Python code? def add(a, b=2): return a + b print(add(3))

   1. A.3
   2. B.5
   3. C.6
   4. D.Error because b is not provided
   See the answer and solution
2. Question 2Q-25AE4A

   What is the output of the following Python code? x = 10 def change(): global x x = x + 5 return x print(change(), x)

   1. A.15 10
   2. B.10 15
   3. C.15 15
   4. D.Error because x is used inside the function
   See the answer and solution
3. Question 3Q-DFEDCC

   Explain the difference between formal parameters and actual parameters in Python functions. Give a suitable example using a function call.

   See the answer and solution
4. Question 4Q-EC98DD

   What is the output of the following Python code? def product(a, b): return a * b print(product(b=3, a=4))

   1. A.7
   2. B.12
   3. C.43
   4. D.TypeError
   See the answer and solution
5. Question 5Q-319499

   What is the output of the following Python code? def mystery(n): if n <= 1: return 1 return n * mystery(n - 2)

   print(mystery(5))

   1. A.5
   2. B.8
   3. C.15
   4. D.25
   See the answer and solution