Python Create List From 1 to N with Step Size : Chris

Python Create List From 1 to N with Step Size
by: Chris
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🎯 Problem Formulation: How to create a list from 1 to n with a specified step in Python?

Let’s start with one of the easiest ways: 👇

Method 1. Using range() in List Comprehension

Using [i for i in range(1, n+1, step)] is the most straightforward method using built-in Python functions: list comprehension and range().

list_with_step = [i for i in range(1, n + 1, step)]

Method 2. Using numpy.arange()

For those using the NumPy library, particularly effective for large data sets due to its optimized performance.

import numpy as np
list_with_step = np.arange(1, n + 1, step).tolist()

Method 3. Using List Slicing

Generate a full list first and then use slicing to select every stepth element.

list_with_step = list(range(1, n + 1))[::step]

Method 4. Using itertools.islice with itertools.count

Utilizes lazy evaluation, ideal for very large ranges.

from itertools import islice, count
list_with_step = list(islice(count(1, step), (n - 1) // step + 1))

Method 5. Using a for loop with Index Management

Explicitly controls the index, providing clarity at the cost of more verbose code.

list_with_step = []
for i in range(1, n + 1):
    if (i - 1) % step == 0:

Method 6. Using filter with range

Applies a filter function to a range, extracting elements based on a condition.

list_with_step = list(filter(lambda x: (x - 1) % step == 0, range(1, n + 1)))

Method 7. Using a while loop

This method manually controls the addition of elements to the list.

list_with_step = []
i = 1
while i <= n:
    i += step

Method 8. Using itertools.takewhile with itertools.count

Combines two itertools functions to generate a controlled sequence that stops when a condition is met.

from itertools import takewhile, count
list_with_step = list(takewhile(lambda x: x <= n, count(1, step)))

Method 9. Using map and range

Incorporates a transformation directly within the map function for adjusting step intervals.

list_with_step = list(map(lambda x: 1 + (x * step), range((n + step - 1) // step)))

Method 10. Advanced Conditional List Comprehension

Incorporates condition checks directly within a list comprehension for greater control.

list_with_step = [i for i in range(1, n + 1) if (i - 1) % step == 0]

Also check out my related article:

👉 Python Create List From 1 to N

April 22, 2024 at 05:24PM
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