Unit 2

Question 1

is just a file of Python code, which can include
statements, function definitions, and class definitions

Answer 1

module - a script or a short Python program, can be contained in one module

Question 2

contains the starting point of program
execution

Answer 2

main module

Question 3

contain function and class definitions

Answer 3

supporting modules

Question 4

the types of words or symbols used to construct sentences
▪ some basic symbols are keywords, such as if, while, and
def

Answer 4

Lexical Elements

Question 5

Python keywords and names are _________

Answer 5

case-sensitive - while is a keyword, While is a programmer-defined name

Question 6

− named locations in computer memory
− languages define rules for naming variables
− should have meaningful names

Answer 6

Variables

Question 7

In Python, a variable is created when you assign a value to
it. It has no command for declaring a variable.

Answer 7

yeah

Question 8

A variable can have a short name (like x and y) or a more
descriptive name (age, carname, total_volume).

Answer 8

yeah

Question 9

Rules for Python variables:

Answer 9

• a variable name must start with a letter or the underscore
  character
• a variable name cannot start with a number
• a variable name can only contain alpha-numeric characters
  and underscores (A-z, 0-9, and _)
• variable names are case-sensitive (age, Age and AGE are
  three different variables)

Question 10

nouns or adjectives: denote Boolean values

Answer 10

variable names

Question 11

• verbs: denote actions
• nouns or adjectives: denote values returned

Answer 11

function and method names

Question 12

the types of sentences (expressions, statements, definitions,
and other constructs) composed from the lexical elements

Answer 12

Syntactic Elements

Question 13

indentation and line breaks are ___________ in Python code

Answer 13

significant

Question 14

Python uses _____________________ to mark the syntax of many types of sentences

Answer 14

white space (spaces, tabs, or line breaks)

Question 15

Literals

Answer 15

❑Numbers
* integers or floating-point numbers are written as they are in
other programming languages
❑The Boolean values True and False are keywords
❑Some data structures, such as tuples, lists, and dictionaries,
also have literals

Question 16

Data Typing

Answer 16

− any variable can have a value of any type
− variables are not declared to have a type, they are simply
assigned a value
− all values or objects have types

Question 17

True/False: any variable can’t have a value of any type

Answer 17

False

Question 18

all values or objects have no types

Answer 18

False

Question 18

True/False: variables are not declared to have a type, they are simply assigned a value

Answer 18

True

Question 19

Text Type - str
Numeric -Types int, float, complex
Sequence -Types list, tuple, range
Mapping Type - dict
Set Types - set, frozenset
Boolean Type - bool
Binary Types - bytes, bytearray,
memoryview
None Type - NoneType

Question 20

a positive or negative whole number without decimals, of
unlimited length

Answer 20

int or integer

Question 21

• a positive or negative number containing one or
  more decimals
• can also be scientific
  numbers with an “e” to
  indicate the power of 10

Answer 21

float or floating point
number

Question 22

written with a “j” as the imaginary part

Answer 22

Complex numbers

Question 23

The String Data Type

Answer 23

String Length
Slicing Strings
Modify Strings
String Concatenation
Format Strings

Question 24

to format selected parts of a string

Answer 24

format

Question 25

to insert characters that are illegal in a string, use an _________

Answer 25

Escape Character

Question 26

________ or type conversion, convert from one data type to anothe

Answer 26

Casting

Question 27

type conversion is done automatically, without any user
involvement

Answer 27

Implicit Type Conversion

Question 28

using predefined functions that act
as a constructor of another data
type

Answer 28

Explicit Type Conversion

Question 29

− used to explain the code
− used to make the code more readable
− start with a #

Answer 29

Comments

Question 30

Python does not have a syntax for this
− to add a multiline comment, use # for each line or use a
multiline string

Answer 30

Multiline Comment