Data Types and Variables

Question 1

(text) string

Answer 1

“double quotes” and ‘single quotes’

Question 2

implicit type casting

Answer 2

instead of string f= “fff”

you can do f = “fff” amd the result is the same

Question 3

Comments

Answer 3

like this

Question 4

Addition operator + for

a= “lol”

b=”no”

Answer 4

a + b

Question 5

string concatonation of strings “andy” and “rom”

(combine)

Answer 5

print(“andy” + “rom”)

Question 6

\n newline for “hello world” (print 3 lines)

Answer 6

print(“Hello World\nHello World\nHello World”)

Question 7

Can operators have different variable types?

(Ex: a=5 , b=”lol” -> print(a + b)

Answer 7

No, the variable types must match

Question 8

Alternating string quotes

Ex:String concatonation is done with the “+” sign.

How is this written?

Answer 8

(‘String Concatenation is done with the “+” sign.’)

Question 9

input() function

input(“What is your name”)

Answer 9

Lets the user enter in a string

Question 10

comments

single line

multiline

Answer 10

hey whats up

Question 11

len function

Ex:

len(“fax”)

• string bn = “jams”

len(bn)

Answer 11

• # prints (the length of the string)

3

-#prints(length of the string)

4

Question 12

Variable

Answer 12

labels for storing information(values)

Question 13

Operator precedence

Answer 13

PEMDAS

Question 14

Declaring a variable

Ex: Named result with a value of 3

Answer 14

result = 3

Question 15

Expression

-Are these expressions?

3 * 3 , result + 4

Answer 15

anything that Python can evaluate to a value

-Yes!

Question 16

Data type

-Is string and bool a data type?

Answer 16

classes and variables that are usually predefined

-Yes!

Question 17

What does type() function do?

-Ex:

lmao = 5

type(lmao)

Output: ?

Answer 17

Shows the class or variable type of the variable

-

Question 18

Variable/data type rules

• What can they include?
• What MUST they start with?

Answer 18

• Lowercase and uppercase letters,numbers and underscores: _
• letter or the underscore character and be case-sensitive

Question 19

Camel Case

• What is it for real cool person?
• Python naming convention for real cool person ?

Answer 19

Common variable naming convention

• realCoolperson
• Underscore real_cool_person

Question 20

Escaping(for strings)

-Give an example in this(single quote):

It’s an escaped quote

-Give an example in this(double quotes):

I’m a so-called “scipt kiddie”

Answer 20

-Add a \ BEFORE the ‘ or “ to prevent confusion

‘It's an escaped quote!’

-“I’m a so-called "script kiddie"”

Question 21

Multiline strings

-Ex:

This is line 1,

… this is line 2,

… this is line 3.

Answer 21

• Triple quotes

”"”This is line 1,

… this is line 2,

… this is line 3.”””

Question 22

Multiline strings with quotes inside

-Ex: He said: “Hello, I’ve got a question” from the audience

Answer 22

-He said: “Hello, I’ve got a question” from the audience

Question 23

‘a’ + ‘b’ OUTPUT?

‘a’ - ‘b’ OUTPUT?

Answer 23

• a+b
• Minus with string doesn’t work

Question 24

mystring = “Hello World”

mystring.lower()

OUTPUT?

Answer 24

hello world

Question 25

‘Hello world’.split(‘ ‘)

[‘Hello’, ‘world’]

-What does this do?

Answer 25

Splits string into an array with 2 values

Question 26

Split whitespace

• ‘Hello \t\n there,\t\t\t stranger.’.split() OUTPUT?
• What happened?

Answer 26

[‘Hello’, ‘there,’, ‘stranger.’]

-Each word got split into a list

Question 27

Replace parts of a string

replace(old, new, # of times)

‘Hello world’.replace(‘H’, ‘h’)

OUTPUT and expain

Answer 27

H was replaced with h

hello world

Question 28

Reversing a string

mystring = ‘Hello world’

mystring[::-1]

Answer 28

‘dlrow olleH’

Question 29

Python string format with f-strings

Ex :

my_age = 40

f ‘ ‘ (What goes in the single quotes?)

OUTPUT: My age is 32

Answer 29

f’My age is {my_age - 8}’

• f string allows you to scan for expressions in curly braces {ag }

Question 30

functions

Answer 30

something you can call, such as an argument

Question 31

print() funciton

-You can mix

Answer 31

print text to our screen.

-argument types

Question 32

bool(binary)

Question 33

method

Answer 33

Ex: title()

An action python can perform on a piece of data

Question 34

first_name = “ada”

last_name = “lovelace”

fullname =

f string that prints ‘ada lovelace’

Answer 34

fullname =f “{first_name} {last_name} “

print(fullname)

Question 35

n newline and tab for hello world (3 lines)

Answer 35

print(“New plan:\n\t1.Look at dolphins\n2.Smile\n3.Die”)

Question 36

Stripping Whitespace

(right)

rstrip()

-Ex: Use this for lol =”python “ to take away the whitespace

(left)

Answer 36

lol = “python”

lol = lol.rstrip()

lol = lol.strip()

Question 37

Exponents

How would 5^2 and 6^3 be written>?

Answer 37

5 **2

6**3

Question 38

floats(decimals)

0.2 * 2.0

Answer 38

.4

Question 39

Intergers and Floats

Defaults to float when mixed with an interger

4/2

8 + 3.0

Answer 39

2. 0 decimal
3. 0

Question 40

Underscores in numbers

universenumber= 14_000

Answer 40

14000

Question 41

Multiple assignment

-Assign x,y and z variable to 0 in the same line

Answer 41

x,y,z= 0,0,0

Question 42

Constants

(varaible that stays the same throughout the program)

Answer 42

MAX_CON = 100