Ch.3 programming Variable and assignments

Variable

named item that holds a value

assignment statement

assigns a variable with a value

Reserved words

words that are part of the language and cannot be used as a programmer-defined name

object

represents a value and is automatically created by the interpreter when executing a line of code,For example, executing x = 4 creates a new object to represent the value 4

Garbage collection

deleting unused objects, automatic process that frees up space

Mutability

indicates whether the objects value is allowed to be changed

Immutable

means values cannot be changed, for ex. integer and strings cannot be changed

type()

returns the type of an object

id()

gives the value of an object’s identity

floating-point number

a real number that refers to the decimal point appearing anywhere(floating) in the number. ex. 0.0001 or 98.6

float

data type for floating point numbers(decimal point)

7.2e-4

0.00072

540,000,000

5.4e8

overflow

when a value is too large to be stored in the memory allocated by the interpreter

print(f"{my_float:.2f}")

syntax for outputting the float my_float with two digits after the decimal point