Variables
Table of contents
Description
Variables are named areas of memory that we can use to store data. The Python interpreter categorizes all variables as Objects. All objects have three things: a name, a type, and a value.
- Python Docs: Assignment statements
Assignment Statements
Assignment statements bind a value with a name. Variable names must be to the left of the assignment operator; values must be to the right:
flavor = 'chocolate chip''chocolate chip' = flavor
Naming Rules
- Python PEP8: Variable Names
- No spaces.
- First character must be either an alphabetic character or an underscore.
- Can only contain alphabetic characters, numeric characters, or underscores.
- Cannot be a reserved word:
| None | continue | global | pass |
| True | def | if | raise |
| and | del | import | return |
| as | elif | in | try |
| assert | else | is | while |
| async | except | lambda | with |
| await | finally | nonlocal | yield |
| break | for | not | or |
| False | class | from |
Reassignment
When a value is bound to a variable, it is not permanent. Python code is executed sequentially, and keeps no record of prior variable values: