WEEK 1 python

Question 1

3 + 3 = 6
what are the
values
operator
evaluation

Answer 1

3 = values
+ = operator
6 = evaluation

Question 2

what is ‘’//’’

Answer 2

integrer division(floor division): 22/8 = 2.75 but we only take 2

Question 3

integers
floating numbers
strings

Answer 3

integers (INT): whole numbers (-2, 0, 2)

floating numbers (FLOATS): numbers with decimals (-1.25, 0.5, 1.0)

Strings (STR): text values inside quotes: (‘Hello’, ‘11 cats’)

Question 4

How does + (addition) work for numbers and strings

Answer 4

Numbers: adds them (2 + 3 = 5)
Strings: joins them together ‘John’ + ‘Bob’ –> JohnBob

Question 5

How do you add a string and a number

Answer 5

(‘Alice’ + str(43)) –> Alice43

you have to convert the number to a string manually.

Question 6

how does multiplication work for numbers and strings

Answer 6

Numbers: 4 * 5 = 20

Strings and numbers: ‘Alice’ * 6 –> AliceAliceAliceAliceAliceAliece (repeats the string X times)

you cannot multiply two string together

Question 7

what does a variable do

Answer 7

stores a value in memory for later use, you create this by using ‘=’

spam = 40
from now on the variable ‘spam’ now holds 40

Question 8

what is overwriting

Answer 8

if yo assign a new variable to a variable, the old value is lost.

Question 9

valid variable names can only use

Answer 9

letters, numbers and underscores (_)

Question 10

valid variable names are…

Answer 10

cannot start with a number, contain spaces/special characters (like (-, $, @), case sensitive, camelcase can be used (every new word starts with capital letter)

Question 11

what is done with the #

Answer 11

nothing, python ignores it, these are just comments for yourself

Question 12

What is the Interactive Shell?

Answer 12

A tool that lets you run Python ONE LINE AT A TIME and see results immediately (REPL).

Question 13

What is the File Editor?

Answer 13

A tool for writing FULL Python programs, where code is saved in a .py file and run all at once.

Question 14

What is the difference between the Interactive Shell and File Editor?

Answer 14

The Interactive Shell runs code instantly (»> prompt), while the File Editor saves and runs entire scripts.

Question 15

Why doesn’t the File Editor run code when you press Enter?

Answer 15

Because it is used for writing full programs, not for executing commands line-by-line.

Question 16

What happens when a Python program runs from a file?

Answer 16

Python executes the entire script and terminates when there are no more lines of code.

Question 17

commenting out

Answer 17

when writing a program, you may want to temporarily disable a line of code without deleting it. Instead of removing the line, you can “comment it out” using #.

Question 18

Functions do something when called.

Answer 18

In Python, when you write print(“Hello, world!”), you are calling the print() function.

Question 19

What is input() used for?

Answer 19

input() allows the user to type information, making the program interactive.

Question 20

What happens if you hardcode a value? (myName = “Alice”)

Answer 20

The program always uses “Alice”—it never changes, no matter who runs it.

Question 21

Why use input() instead?

Answer 21

It lets any user enter their own name, making the program dynamic and interactive.

Question 22

What is len() used for?

Answer 22

It counts the number of characters in a string, including spaces.

Question 23

What is the output for len(“Alice”)?

Answer 23

5 (since “Alice” has 5 characters: A, l, i, c, e)

Question 24

Can you convert a number to a string?

Answer 24

Yes! Use str(number) to turn a number into a string.

Question 25

Can you convert a string to a number?

Answer 25

Yes! Use int(string) for whole numbers and float(string) for decimals, so only possible with numbers that are treated as words.

Question 26

What does int() do?

Answer 26

Converts a decimal number or a string into an integer (whole number).

Question 27

Example of int()?

Answer 27

int(1.99) → 1 (Rounds down!)

Question 28

What does float() do?

Answer 28

Converts an integer or a string into a decimal (floating-point number).

Question 29

Example of float()? --> float(10)

Answer 29

→ 10.0

Question 30

Why does input() return a string?

Answer 30

input() always returns text, even if you enter a number

Question 31

''42'' is it a number of a string

Answer 31

with '' it is a string

Question 32

is this correct 42 == ''42''

Answer 32

false

Question 33

how can you change 42 == ''42'' to the correct version

Answer 33

42 == int( ''42'')

Question 34

is this the same according to python: 42 == 42.0

Answer 34

yes

Question 35

what does python do with extra zeros

Answer 35

they ignore them, so 042.000 == 42.0