AutomateTheBoringStuffWithPython/practice_questions/ch02/README.md

CHAPTER 2 - FLOW CONTROL

Q: 1. What are the two values of the Boolean data type? How do you write them?

A: True, False

Q: 2. What are the three Boolean operators?

A: and, or, not

Q: 3. Write out the truth tables of each Boolean operator (that is, every possible combination of Boolean values for the operator and what they evaluate to).

combination	value
True and True	True
True and False	False
False and True	False
False and False	False
True or True	True
True or False	True
False or True	True
False or False	False
not True	False
not False	True

Q: 4. What do the following expressions evaluate to?

(5 > 4) and (3 == 5) # False
not (5 > 4) # False
(5 > 4) or (3 == 5) # True
not ((5 > 4) or (3 == 5)) # not (True or False) => False
(True and True) and (True == False) # True and False => False
(not False) or (not True) # True or False => True

Q: 5. What are the six comparison operators?

Operator	Meaning
==	Equal to
!=	Not equal to
<	Less than
>	Greater than
<=	Less than or equal to
>=	Greater than or equal to

Q: 6. What is the difference between the equal to operator and the assignment operator?

A: == asks whether two values are the same as each other; = puts the value on the right into the variable on the left.

Q: 7. Explain what a condition is and where you would use one.

A: Condition is the boolean expressions. You can use it in if...elif...else, while, for statements.

Q: 8. Identify the three blocks in this code:

spam = 0 #1
if spam == 10: #1
    print('eggs') #2
    if spam > 5: #2
        print('bacon') #3
    else: #2
        print('ham') #3
    print('spam') #2
print('spam') #1

Q: 9. Write code that prints Hello if 1 is stored in spam, prints Howdy if 2 is stored in spam, and prints Greetings! if anything else is stored in spam.

A: condition.py

Q: 10. What can you press if your program is stuck in an infinite loop?

A: Ctrl-C

Q: 11. What is the difference between break and continue?

A: break can exit loop clause immediately, continue just jumps back to the start of the loop and reevaluates the loop's condition.

Q: 12. What is the difference between range(10), range(0, 10), and range(0, 10, 1) in a for loop?

A: same.

Q: 13. Write a short program that prints the numbers 1 to 10 using a for loop. Then write an equivalent program that prints the numbers 1 to 10 using a while loop.

A: loop.py

Q: 14. If you had a function named bacon() inside a module named spam, how would you call it after importing spam?

A: spam.bacon()

Extra credit: Look up the round() and abs() functions on the Internet, and find out what they do. Experiment with them in the interactive shell.

A: extra.py