PL Prefinals

• integers

• floating points

the numbers handled by modern computers are of the following types:

integers

numbers devoid of the fractional part

floating points

are numbers that contain or can contain the fractional part

they differ significantly in how they are stored in computer memory and the range of acceptable values

how do integers and floating points differ?

type

the characteristic of the numeric value that determines its kind, range, and application is called the ___

true

(T/F) integer is a string od digits that make up a number and must not be interjected with any characters that are not digits

the use of underscores in numeric literals

when it comes to integers, what kind of provision does python allow?

octal and hexadecimal numbers

these are the 2 additional conventions in python that are unknown to the world of mathematics

if an integer number is preceded by an 0o prefix (zero-o)

how will we know that the number will be treated as an octal value?

digits taken from the [0...7] range only

in octal values, the number must contain digits in what range?

it is an octal number with a decimal value equal to 83

is 0o123 an octal or hexadecimal number? and what is the decimal value?

yes

does the print() function perform the conversion automatically?

if it is preceded by the prefix 0x (zero-x)

how will we know if the number will be treated as a hexadecimal value?

it is a hexadecimal number with a decimal value equal to 291

is 0x123 an octal or hexadecimal number? and what is the decimal value?

they are designed to represent and store numbers with a non-empty decimal fraction

what are floats designed to represent and store?

no, python does not accept the comma as it has a reserved meaning

does python allow the use of commas in floats?

yes, as 0.4 can be written as .4, etc. and have its type or value unchanged

is removing the zero if it is the only digit in front of or after the decimal point possible?

exponents

essentially, the point makes a number a float. but also, the letter E/e, which represents ___ incorporated into a number string such as 3E8

• the exponent (the value after E) has to be an integer

• the base (the value in front of the E) may be an integer

what are the guidelines when it comes to using E in floats?

6.62607E-34

the value of a physical constant called planck’s constant is 6.62607 × 10^-34. to code this, it will be formatted as what?

no, it doesn’t mean that python will present it in the same way as it may sometimes choose a different notation

will the chosen form of coding float values be presented as is by python?

it chooses the more economical form of the number’s presentation

the float literal 0.0000000000000000000001 will result in 1e-22 when run using the print() function in python. what is the reasoning behind this?

strings

these are used when processing texts and not numbers. it is incomplete without quotes (““)

escape character

in instances where words inside a string need to be quoted, the first possible solution is based on the concept of the ___, which is played by the backslash

a quote preceded by a backslash changes its meaning — it is not a delimiter but just a quote

what happens to the quote when we use a backslash?

using an apostrophe instead of a quote

the second solution when words inside a string need to be quoted

• if a string opens with a quote, it must also be closed with a quote

• if a string starts with an apostrophe, it must also end with an apostrophe

in using quotes and apostrophes, either of these characters may delimit strings, but it should be consistent with these 2 guidelines:

boolean value

each time python is asked if one number is greater than another, it always results in the creation of some specific data, which is a ___

george boole

in boolean values, the name comes from ___

the laws of thought

george boole is the author of the fundamental work ____, which contains the definition of boolean algebra

a part of algebra that makes use of only two distinct values: True and False, denoted as 1 and 0

what is the definition of Boolean algebra?

because True and False have strict denotations

why is python considered a binary reptile

true

(T/F) in boolean values, the results cannot be changed, and the symbols must be taken as they are, including case-sensitivity

• an expression produces a value

• an assignment statement stores that value in a variable

two reasons why expressions and assignment statements are fundamental to programming

expression

a combination of values, variables, operators, and function calls that result in a computed value

operands

the values and variables

operators

collective term for symbols like +, -, *, /

arithmetic expressions

these involve mathematical operations such as addition, subtraction, multiplication, division, and exponentiation.

are used in scenarios requiring numerical computations