In Python coding interviews, efficiency and code simplicity are crucial. The problem here requires calculating the sum of integers from 1 to 100 using just one line of code. This means we need to leverage Python’s built-in functions to achieve the goal in the most concise manner.
1. The Traditional Approach: Using a Loop.
Before optimizing, let’s consider the most common way of summing numbers:
total = 0
for i in range(1, 101):
total += i
print(total)
This approach is valid, but it consists of multiple lines and a loop, making it less efficient.
2. Using `range()` to Generate a Sequence.
Python provides the `range()` function, which generates a sequence of numbers. To create a sequence from 1 to 100, we use:
numbers = range(1, 101)
Here, `numbers` contains all integers from 1 to 100.
3. Using `sum()` for Efficient Summation.
Python has a built-in function `sum()` that quickly sums up elements in an iterable:
total = sum(range(1, 101)) print(total)
This method eliminates the need for a loop and provides a much cleaner solution.
4. The One-Line Solution.
By combining the two functions, we arrive at the ultimate one-liner:
print(sum(range(1, 101)))
This single line of code does the following:
- Generates a sequence of numbers from 1 to 100 using `range(1, 101)`.
- Computes their sum using `sum()`.
- Prints the result with `print()`.
5. Why is This the Best Approach?
- Concise: Achieves the task in just one line.
- Efficient: `sum()` is implemented in C, making it significantly faster than manual loops.
- Readable: The code is self-explanatory and easy to understand.
6. Conclusion.
The best way to compute the sum of integers from 1 to 100 in Python is to use `sum(range(1, 101))`. This method is efficient, elegant, and aligns with Python’s philosophy of simplicity and readability. Next time you encounter such a problem, remember this one-liner for an optimized solution.
7. Demo Video.
You can watch the following demo video by select the subtitle to your preferred subtitle language.