Naming Python variables is an important aspect of writing readable and maintainable code.

Use Descriptive Names

Choose names that clearly indicate the purpose or content of the variable. This makes your code easier to understand for others and for your future self.

# Bad
x = 5
y = 10

# Good
number_of_students = 5
total_score = 10

Use Lowercase Letters

Python convention is to use lowercase letters for variable names. This is consistent with the PEP 8 style guide.

# Bad
NumberStudents = 5
# Good
number_students = 5

Separate Words with Underscores

If your variable name consists of multiple words, separate them with underscores. This improves readability and makes it clear that the name is composed of multiple words.

# Bad
studentName = "John Doe"
# Good
student_name = "John Doe"

Avoid Using Reserved Keywords

Do not use Python’s reserved keywords as variable names. This can lead to unexpected behavior and errors.

# Bad
class = "Python"
# Good
class_name = "Python"

Be Consistent

Consistency is key in naming conventions. Stick to the same style throughout your codebase.

# Inconsistent
number_students = 5
NumberOfTeachers = 10  # Bad, should be number_teachers

Avoid Single-Letter Variable Names

While it might be tempting to use single-letter variable names for quick coding, they can make your code harder to understand. Use meaningful names even if they are longer.

# Bad
a = 5
b = 10

# Good
initial_value = 5
final_value = 10

Use Plural Nouns for Collections

When naming variables that represent collections (like lists or dictionaries), use plural nouns.

# Good
students = ["John", "Jane"]
scores = [85, 90]

Avoid Using the Same Name for Different Variables

Do not reuse variable names within the same scope. This can lead to confusion and potential bugs.

# Bad
x = 5
x = 10  # Reusing the same variable name

# Good
x = 5
y = 10  # Using different variable names

By following these guidelines, you can write more readable and maintainable Python code.