Mastering Python sum() Function

The sum() function in Python is one of the most frequently used built-in functions. While it’s often used to sum numbers in a list, it can also count booleans or aggregate values from a comprehension.

Python sum function example

Mastering Python sum() Function 💡

✅ Basic List Summation

The most common use is to total a list of numbers.

nums = [1, 2, 3, 4, 5]
total = sum(nums)
print(total)  # 15

✅ Count True Values in a Boolean List

Because True equals 1 and False equals 0, sum can count how many True values exist.

values = [True, False, True]
count_true = sum(values)
print(count_true)  # 2

✅ Use with List Comprehension

Sum works perfectly with generator expressions for custom aggregations.

word_lengths = sum(len(word) for word in ["hello", "world"])
print(word_lengths)  # 10

From counting flags to totaling word lengths, sum() is a small but powerful tool that makes your Python code cleaner and faster.

"Simplicity in code creates space for clarity. Use Python's built-ins to write less and express more." — CodeVerse

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