🎯 Best Practices — Write Professional Loops

Follow these conventions to write code that others can understand and maintain.

🎯 Practice 1: Use Meaningful Variable Names

# ❌ BAD - unclear what x and y are
for x in data:
    y = x * 2
    print(y)

# ✅ GOOD - clear variable names
for item in data:
    doubled = item * 2
    print(doubled)

💡 Practice 2: Keep Loops Simple

# ❌ BAD - too much logic in one loop
for student in students:
    grade = student['grade']
    if grade > 80:
        grade = grade + 5
    student['final_grade'] = grade
    if grade >= 90:
        student['category'] = 'A'
    else:
        student['category'] = 'B'

# ✅ GOOD - separate concerns
for student in students:
    student['final_grade'] = calculate_final_grade(student)
    student['category'] = assign_category(student)

🔍 Practice 3: Choose the Right Loop

# ❌ BAD - using while when for is clearer
i = 0
while i < len(items):
    print(items[i])
    i = i + 1

# ✅ GOOD - for loop is more Pythonic
for item in items:
    print(item)

🎨 Practice 4: Avoid Deep Nesting

# ❌ BAD - hard to follow
for i in range(10):
    for j in range(10):
        for k in range(10):
            if condition1:
                if condition2:
                    print("Found it!")

# ✅ GOOD - extract to function
for i in range(10):
    for j in range(10):
        if process_item(i, j):
            print("Found it!")

def process_item(i, j):
    for k in range(10):
        if condition1 and condition2:
            return True
    return False

📊 Practice 5: Comment Complex Logic

# Calculate running average
total = 0
count = 0
for score in scores:
    total = total + score  # Add score
    count = count + 1  # Count items
average = total / count  # Divide

# Or better yet, use clearer variable names:
sum_of_scores = 0
for score in scores:
    sum_of_scores = sum_of_scores + score
average = sum_of_scores / len(scores)

🚀 Practice 6: Use Built-in Functions

# ❌ NOT NEEDED - Python has better ways
total = 0
for number in numbers:
    total = total + number
average = total / len(numbers)

# ✅ USE BUILT-INS - cleaner and faster
average = sum(numbers) / len(numbers)

🔑 Key Takeaways

🔗 What's Next?

You've mastered beginner loops! Switch to Advanced Path for deeper knowledge.

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