Before writing real python code, we must make sure the code will run properly. One way of doing that is following naming rules when creating variables. I will list the rules below.
1. Must only contain letters, numbers, and underscores, other characters are unsupported.
2. Cannot begin with a number.
3. Cannot use python keywords.
Examples of Proper Naming
1. name
2. _age
3. User3
Examples of Bad Naming
1. 2user
2. user-name
3. for