Finishing day 03
What is programming
Programming is write a bunch of files, control the direction of change of variables
Parameters, properties -> Variables
IPO
variable
What is variable
Variable describing the state of things in the world change
Variable is the concept of the interpreter provided only when running python
Compositional variables
+ + Variable name = variable value
Variable names fate specification
Variable names numbers, letters, underscores and can not start with a number, not name keyword
Two options for defining variables
Underline the word segmentation, llamas body separate words
constant
python constant and there is no convention in uppercase constants
Python memory management
Variable is defined in memory address space to open up a store
Reference count
Reference count number is variable reference value
Garbage collection
In the python would run [-5,256] first opened up for use, references to these will not be recovered 0
Other references to 0 by the system will reclaim the memory space
Three ways formatted output
f placeholders, format format, placeholders%
What is the data type
Data type is the classification of all the world state
Digital, character, dictionary, list, boolean
Digital Type
All things state numerical value
Defined way
A = 77
Instructions
+ - * / // % **
String
Description of the state of things in the world
definition
name = 'ssssss'
Instructions
Addition multiplication * +