WEEK 2, python deel 1

Question 1

python has two boolean VALUES

Answer 1

true and false

Question 2

what is special about boolean values compared to other quotes

Answer 2

they do not need quotes

Question 3

what does != mean

Answer 3

not equal to

Question 4

explain the comparisons with boolean values

Answer 4

a = 10
b = 20

print (a == b) #false
print (a != b) #true
print (a < b) #true
etc

Question 5

whats the difference between == and =

Answer 5

== is used for comparison and = is used for assignment

Question 6

explain x = 5

Answer 6

you assign 5 to x

Question 7

will an integer and string ever be equal

Answer 7

no
print (42 == ‘42’)

Question 8

Python has three Boolean OPERATORS

Answer 8

and, or, not

Question 9

Explain the ‘and’ operator

Answer 9

returns true only if BOTH values are true

Question 10

explain the ‘or’ operator

Answer 10

returns true if at least one of the value is true

Question 11

explain the ‘not’ operator

Answer 11

flips the boolean (true and false) value, not true: false, not false: true

Question 12

what are the python boolean expressions in order:

Answer 12

+,-,*,/ then ==,!=,<,>,<=,>= then ‘not’ then ‘and’ then ‘or’

Question 13

flow control statements

Answer 13

they have a condition and a clause, a block of code only runs if the condition is true

Question 14

block

Answer 14

group of lines that belong together and are intended at the same level.

Question 15

python has three main flow control types

Answer 15

1. Conditional Statements (if, elif, else)
2. Loops (for, while)
3. Break and Continue Statements

Question 16

if, elif and else

Answer 16

if: checks the first condition
elif: checks the next condition only if the first condition is false
else: runs only if none of the if or elif conditions are true

Question 17

loops in flow control

Answer 17

help in executing a block of code multiple times

Question 18

FOR i in range(3):
print(“Hello”, i)

Answer 18

Hello 0
Hello 1
Hello 2

Question 19

WHILE:
count = 0
while count < 3:
print(“Count is”, count)
count += 1

Answer 19

Count is 0
Count is 1
Count is 2

Question 20

program execution

Answer 20

the process of running the instructions in the code one by one

Question 21

What happens if none of the if or elif conditions are True, and there is no else?

Answer 21

Nothing prints because both conditions were False

Question 22

Can you have more than one elif statement?

Answer 22

Yes! You can have multiple elif statements.

Question 23

Can you put an if inside another if?

Answer 23

Yes, this is called nested if statements.

Question 24

What is the difference between if-elif-else and multiple if statements?

Answer 24

if-elif-else → Only one block runs (once a condition is True, it stops checking).

Multiple if → Each if is checked separately, even if one is already True.

Question 25

Can you have multiple elif statements?

Answer 25

Yes! You can have multiple elif statements, but only one condition will execute.

Question 26

What is a while loop used for?

Answer 26

A while loop repeats a block of code as long as a condition is True.

Question 27

What happens inside a while loop?

Answer 27

1. The condition is checked before each iteration. 2. If True, the code inside runs. 3. The condition is checked again. 4. If False, the loop exits. x = 3 while x > 0: print(x) x = x - 1

Question 28

What happens if a while loop condition is always True?

Answer 28

The loop never stops (Infinite Loop).

Question 29

What does BREAK do inside a loop?

Answer 29

break stops the loop immediately. Execution jumps to the first line after the loop.

Question 30

What does CONTINUE do inside a loop?

Answer 30

continue skips the rest of the current iteration and jumps back to the loop condition.

Question 31

What's the difference between BREAK and CONTINUE

Answer 31

break: Exits the loop immediately continue: Skips to the next iteration

Question 32

Using = instead of == in conditions

Answer 32

always == because comparison

Question 33

Which values are considered True or False in conditions?

Answer 33

falsy values: 0, 0.0, none, false, [], {} truth values: non-zero numbers, non-empty lists/dictionairies

Question 34

What does while not name: do in this code? name = '' while not name: print('Enter your name:') name = input() print('Welcome,', name)

Answer 34

The loop keeps asking for input until the user enters a name (not empty). If name is an empty string ('' → Falsy), the loop continues.

Question 35

What does range(2, 10, 2) generate?

Answer 35

Start: 2 Stop BEFORE: 10 Step by: 2 Sequence: [2, 4, 6, 8]

Question 36

range(2)

Answer 36

Generates [0, 1] (because it starts from 0 and stops before 2)

Question 37

What is a module in Python?

Answer 37

module is a Python file containing a collection of functions and variables that can be reused in programs

Question 38

example of important a module

Answer 38

import math # Imports the math module print(math.sqrt(16)) # Uses a function from math module output: 4.0

Question 39

What is the difference between built-in functions and functions from modules?

Answer 39

Built-in functions (available by default) → print(), input(), len() Modules (need to be imported) → math.sqrt(), random.randint(), sys.exit()

Question 40

What does random.randint(1, 10) do?

Answer 40

Returns a random integer between 1 and 10 (inclusive). Every time you run it, you get a different number.

Question 41

What does sys.exit() do?

Answer 41

Immediately stops the program. but sys is part of the module so you must import sys first