Demo Lecture Part 1

Question 1

break keyword

Answer 1

gives us the ability to exit out of loops whenever we want

Question 2

how do you create an infinite loop?

Answer 2

while(True):

Question 3

what is a boolean value?

Answer 3

True or False

Question 4

what is an int data type?

Answer 4

integer: positive or negative whole number and zero

Question 5

what is a float data type?

Answer 5

a decimal

Question 6

what is a string data type?

Answer 6

a sequence of characters “abc123”

Question 7

what is a list data type?

Answer 7

an ordered sequence of values of other data types [1, 2, 3]

Question 8

what is a dictionary data type?

Answer 8

an unordered collection of key: value pairs eg {“firstname”: “Colt”, “lastname”: “Steele”}

Question 9

string formatting expression using .format and variables

Answer 9

1 define variables
2 print string
3 print string, close with quotes, then .format in round brackets listing variables in order

first_name = “Prerna”
country = “India”
print(“My name is {}. I stay in {}.”.format(first_name,country))

Question 10

string formatting with f strings

Answer 10

1 define variables
2 f’string’
3 variables go in curly brackets

Question 11

can you reassign the same variable to different values?

Answer 11

yes. python will use the last one you wrote

Question 12

what are the python naming restrictions? are variables case-sensitive?

Answer 12

must start with an underscore or letter. rest of the string can be letters, underscores, or numbers. cannot begin a variable with a number. variables ARE case-sensitive

Question 13

how do you write a multi-line comment?

Answer 13

three double quotationcan s

Question 14

how can we capture user input? what data type does it expect?

Answer 14

input(“text for input request).

built-in function that will store user input into a variable. expects a string, so any other type of input must be typecast to the correct data type

Question 15

difference between spacing:
print(“Prerna”+”Gupta”)
print(“Prerna”,”Gupta”)

Answer 15

+ > no space
, > space by default

Question 16

how can you get help with a keyword?

Answer 16

print(help(“keyword”))

Question 17

False

Answer 17

opposite of true, truth value 0

Question 18

None

Answer 18

None is an instance of the NoneType object type. While new NoneType objects cannot be generated, None can be assigned to any variable.

Question 19

True

Answer 19

opposite of false, truth value 1

Question 20

and

Answer 20

A logical operator.both things on either side of and must be true for the entire statement to be true

Question 21

as

Answer 21

creates an alias

Question 22

assert

Answer 22

for debugging

Question 23

async

Answer 23

async” defines a coroutine

Question 24

await

Answer 24

await” suspends or yields execution to another coroutine from within a coroutine.

Question 25

class keyword

Answer 25

To define a class

Question 26

continue

Answer 26

loop control statement.

the code inside the loop following the continue statement will be skipped for the current iteration and the next iteration of the loop will begin.

Question 27

def

Answer 27

for defining a function

Question 28

del

Answer 28

To delete an object

Question 29

elif

Answer 29

or else, if. (condition)

Question 30

else

Answer 30

if all of the above conditions are not true, do this

Question 31

except

Answer 31

Used with exceptions, what to do when an exception occurs

Question 32

finally

Answer 32

Used with exceptions, a block of code that will be executed no matter if there is an exception or not

Question 33

for

Answer 33

“applying to the following”

Question 34

from

Answer 34

To import specific parts of a module

Question 35

global

Answer 35

To declare a global variable

Question 36

if

Answer 36

in the case that (followed by a condition)

Question 37

import

Answer 37

To import a module

Question 38

in

Answer 38

To check if a value is present in a list, tuple, etc.

Question 39

is

Answer 39

To test if two variables are equal

Question 40

lambda

Answer 40

To create an anonymous function(one that does not have a name), takes any number of arguments but limited to only ONE expression

Question 41

nonlocal

Answer 41

To declare a non-local variable

Question 42

not keyword

Answer 42

A logical operator.The return value will be True if the statement(s) are not True , otherwise it will return False .

Question 43

or keyword

Answer 43

A logical operator.one or both of the epressions must be true for the statement to be true.

Question 44

pass keyword

Answer 44

When the user does not know what code to write, So user simply places a pass at that line. Sometimes, the pass is used when the user doesn’t want any code to execute. So users can simply place a pass where empty code is not allowed, like in loops, function definitions, class definitions, or in if statements.

Question 45

raise keyword

Answer 45

To raise an exception

Question 46

return keyword - what does it do?

Answer 46

To exit a function and return a value

Question 47

try keyword

Answer 47

To make a try…except statement

Question 48

while keyword

Answer 48

To create a while loop

Question 49

with keyword

Answer 49

used in exception handling to make the code more readable. It simplifies the management of common resources like file streams.

Question 50

yield keyword

Answer 50

To end a function, returns a generator

Question 51

how do you get the data type of a variable or other piece of data?

Answer 51

type(data)

Question 52

+ operator

Answer 52

adds two operands

Question 53

(-) operator

Answer 53

subtracts two operands

Question 54

(*) operator

Answer 54

multiplies two operands

Question 55

/ operator

Answer 55

division. divides first operand by the second. returns a float

Question 56

// operator

Answer 56

floor division:

divides first operand by the second, returns greatest integer less than or equal to dividend (number being divided)

eg 10/3=3 because 3*3=9, which is the closest whole number to 10. essentially gives the greatest whole number of times the divisor can go into the dividend, gives no remainder.

Question 57

% operator

Answer 57

modulus:

returns REMAINDER when first operand is divided by the second

Question 58

** operator

Answer 58

to the power of. first # raised to the power of second #

Question 59

idx

Answer 59

abbreviation for index

Question 60

can you define a functionw ithin a function? what’s it called?

Answer 60

yes
nested function

Question 61

how do you produce numbers corresponding to list elements?

Answer 61

enumerate function:

enumerate(iterable, start=int)

Question 62

what is a range? and what is the syntax?

Answer 62

a slice of a number line

(x=starting number, y=number AFTER ending number, z=increments)

Question 63

what is a factorial?

Answer 63

the product of all positive integers less than or equal to a given positive integer and denoted by that integer and an exclamation point. Thus, factorial seven is written 7!, meaning 1 × 2 × 3 × 4 × 5 × 6 × 7.