Week 2

Question 1

What is the name of the internal representation of literals used by an executed python program?

Answer 1

Objects OR Values

Question 2

What are operators and operands?

Answer 2

Operators are functions that complete acts of computations.

Operands are the objects that are worked on by operators

Question 3

What is a function call?

Answer 3

This is when we invoke a function in the form X(x)

X = name of function
x = inputs

Question 4

What is the name of the output of a function?

Answer 4

Output OR Return Value

Question 5

What do pearentheses do?

Answer 5

They invoke functions.

Question 6

Are functions objects?

Answer 6

YES

Invoked by ()

Question 7

Are functions objects?

Answer 7

YES

Invoked by ()

Question 8

Can you concatenate a string and integer?

Answer 8

Yes, only if you first convert the integer into a string.

Otherwise, no.

Question 8

Can you concatenate a string and integer?

Answer 8

Yes, only if you first convert the integer into a string.

Otherwise, no.

Question 9

What are the main data types?

Answer 9

Int = integers
Floats = decimals
Str = strings

Question 10

What is a variable?

Answer 10

A variable just refers to an object/value

Question 11

What are assignment statements?

Answer 11

These are statements using ‘=’ to attach one object to another thus creating new variables.

Question 12

Can variables contain spaces?

Answer 12

NO

use underscores if needed

Question 13

Are variables case sensitive?

Answer 13

YES

Question 14

Can variables start with a number?

Answer 14

NO

Question 15

Can variables contain characters other than letters and numbers?

Answer 15

NO (for the most part)

Question 16

Why is “class” an illegal name for a variable in python?

Answer 16

This is a python keyword

Question 17

What is a statement?

Answer 17

It is an instruction that the python interpreter can execute

Question 18

What is an expression?

Answer 18

This is a combination of literals, variable names, operators and calls to functions

Question 19

What is the term which refers to when python interpreters checks prior to execution?

Answer 19

Evaluation

Question 20

What determines the order of evaluation of an expression?

Answer 20

The rules of precedence.

Question 21

What are the rules of precedence?

Answer 21

1. (Parentheses) have highest precedence
2. Exponentiation
3. Multiplication and Division, then Addition and subtraction
4. Operators with same precedence read from left to right

Question 22

Is it possible to reassign a variable?

Answer 22

YES

Question 23

What is the term for when a variable first evaluated?

Answer 23

Initialisation