Flash cards
Review the key moves
What is the main idea behind Python - Variable Names?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
Which statement best captures the main point of this lesson?
Complete the missing token from the example code.
___ = "John"Put the learning moves in the order that makes the concept easiest to apply.
Variable Names
A variable can have a short name (like x and y) or a more descriptive name (age, carname, total_volume).
Rules for Python variables
- A variable name must start with a letter or the underscore character
- A variable name cannot start with a number
- A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )
- Variable names are case-sensitive (age, Age and AGE are three different variables)
- A variable name cannot be any of the Python keywords .
Example
myvar = "John"
my_var = "John"
_my_var = "John"
myVar = "John"
MYVAR = "John"
myvar2 = "John"Example
2myvar = "John"
my-var = "John"
my var = "John"Remember that variable names are case-sensitive
Multi Words Variable Names
Variable names with more than one word can be difficult to read.
There are several techniques you can use to make them more readable:
Camel Case
Each word, except the first, starts with a capital letter:
Pascal Case
Each word starts with a capital letter:
Snake Case
Each word is separated by an underscore character: