Python Practice & Career
Python PEP 8 Best Practices
PEP 8 is Python’s official style guide. Following it makes your code readable, professional and easier for teams (and interviewers) to trust. Here are the rules that matter most.
What Is PEP 8?
PEP 8 is the official set of style recommendations for writing Python code. It doesn’t change what your code does — it makes it consistent and readable, which is exactly what employers expect from clean, maintainable code.
Naming Conventions
| Thing | Style | Example |
|---|---|---|
| Variable / function | snake_case | first_name, calculate_total() |
| Constant | UPPER_CASE | MAX_SPEED = 120 |
| Class | PascalCase | class StudentRecord: |
| Module / file | lowercase | utils.py, data_loader.py |
Key Formatting Rules
- Indent with 4 spaces — never tabs.
- Keep lines under ~79–99 characters.
- Put two blank lines between top-level functions and classes.
- Use spaces around operators: x = a + b, not x=a+b.
- One import per line, grouped: standard library, third-party, then local.
Python
def calculate_total(price, quantity):
"""Return the total cost for a given price and quantity."""
return price * quantity
TAX_RATE = 0.18
total = calculate_total(100, 3)
print(f"Total with tax: {total * (1 + TAX_RATE)}")💡
Let tools do the work: run "pip install black" and format any file with "black yourfile.py". Use "flake8" to catch style issues automatically.