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Showing content from https://www.w3schools.com/python/gloss_python_variable_names.asp below:

Python 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)

Example

#Legal variable names:

myvar = "John"

my_var = "John"

_my_var = "John"

myVar = "John"

MYVAR = "John"

myvar2 = "John"

#Illegal variable names:

2myvar = "John"

my-var = "John"

my var = "John"

Remember that variable names are case-sensitive

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