Chapter 1 Variables, expressions, and statements

Question 1

assignment

Answer 1

A statement that assigns a value to a variable.

An assignment statement creates new variables and gives them values:
»> message = ‘And now for something completely different’
»> n = 17
»> pi = 3.1415926535897931
This example makes three assignments

The assignment statement produces no output.

Question 2

concatenate

Answer 2

To join two operands end to end.

Question 3

comment

Answer 3

Information in a program that is meant for other programmers (or anyone reading the source code) and has no effect on the execution of the program.

Question 4

comment

Answer 4

Information in a program that is meant for other programmers (or anyone reading the source code) and has no effect on the execution of the program.

Question 5

evaluate

Answer 5

To simplify an expression by performing the operations (in order of precedence) in order to yield a single value.

Question 6

expression

Answer 6

A combination of variables, operators, and values that represents a single result value.

Question 7

floating point

Answer 7

A type that represents numbers with fractional parts.
/ for floating point division

Question 8

integer

Answer 8

A type that represents whole numbers.

// for integer division

Question 9

keyword

Answer 9

A reserved word that is used by the compiler to parse a program; you cannot use keywords like if, def, and while as variable names.

Python reserves 35 keywords:

False await else import pass
None break except in raise
True class finally is return
and continue for lambda try
as def from nonlocal while
assert del global not with
async elif if or yield

Question 10

mnemonic
PEMDAS

Answer 10

A memory aid. We often give variables mnemonic names to help us remember what is stored in the variable.

PEMDAS for operators order of precedence in Python

Question 11

modulus operator

Answer 11

An operator, denoted with a percent sign (%), that works on integers and yields the remainder when one number is divided by another.

Question 12

operand

Answer 12

One of the values on which an operator operates.

Question 13

operator

Answer 13

A special symbol that represents a simple computation like addition, multiplication, or string concatenation.

Question 14

rules of precedence

Answer 14

The set of rules governing the order in which expressions involving multiple operators and operands are evaluated.

P
E
M, D
A, S

Question 15

statement

Answer 15

A section of code that represents a command or action. So far, the statements we have seen are assignments and print expression statement.

Question 16

string

Answer 16

A type that represents sequences of characters.

Question 17

type

Answer 17

A category of values. The types we have seen so far are integers (type int), floating-point numbers (type float), and strings (type str).

Question 18

value

Answer 18

One of the basic units of data, like a number or string, that a program manipulates.

Question 19

variable

Answer 19

A name that refers to a value.