Learn How to Use 'for' in Python: Absolute Beginners Tutorial

The for loop is one of the first things you need to understand in Python. It gives you the ability to repeat an action for every item in a collection, and it forms the foundation of nearly every real Python program you will write.

When you are new to Python, loops can seem abstract. This tutorial builds your understanding from the ground up — starting with what a loop actually is, moving through the most common patterns you will use every day, and finishing with interactive challenges to test what you have learned.

What Is a for Loop?

A for loop tells Python: "go through this collection of items, and for each one, do this." The loop body — the indented code beneath the for statement — runs once per item. When the collection runs out of items, the loop ends and Python continues with the rest of your program.

The basic structure looks like this:

for item in collection:
    # this block runs once per item
    print(item)

Three things matter here. First, the word for starts the statement. Second, you choose a name for the loop variable — item in the example above — which Python will automatically update on each pass to hold the current value from the collection. Third, the colon at the end of the for line signals that an indented block follows.

The word you choose for the loop variable does not matter to Python — it only matters to you and anyone else reading your code. Pick a name that describes what each item represents. If you are looping over a list of usernames, call it username. If you are looping over a list of prices, call it price.

colors = ["red", "green", "blue"]

for color in colors:
    print(color)

# Output:
# red
# green
# blue

Python reads this as: "for each color in the colors list, print that color." The list has three items, so the print statement runs exactly three times. The variable color holds "red" on the first pass, "green" on the second, and "blue" on the third.

Iterating Over Lists and Strings

Python's for loop works on any object that is iterable — meaning any object Python knows how to step through one item at a time. Lists and strings are both iterable, and they are the two types you will use most often as a beginner.

Looping over a list

A list holds multiple values in a single variable. The for loop visits each value in the order it was added to the list.

scores = [88, 72, 95, 60]

for score in scores:
    print("Score:", score)

# Output:
# Score: 88
# Score: 72
# Score: 95
# Score: 60

Looping over a string

A string is a sequence of characters, and Python treats each character as an individual item when you loop over it.

word = "Python"

for letter in word:
    print(letter)

# Output:
# P
# y
# t
# h
# o
# n

Using break and continue

Two keywords let you control what happens inside the loop. break exits the loop immediately. continue skips the rest of the current iteration and moves straight to the next item.

numbers = [1, 2, 3, 4, 5]

# break — stop the loop when we hit 4
for n in numbers:
    if n == 4:
        break
    print(n)
# Output: 1  2  3

# continue — skip even numbers
for n in numbers:
    if n % 2 == 0:
        continue
    print(n)
# Output: 1  3  5

Using range() With a for Loop

range() is a built-in Python function that generates a sequence of numbers. It is the most common way to run a loop a specific number of times when you do not have a list to iterate over.

# range(stop) — generates 0, 1, 2, ... stop-1
for i in range(5):
    print(i)
# Output: 0  1  2  3  4

# range(start, stop) — starts at start, stops before stop
for i in range(1, 6):
    print(i)
# Output: 1  2  3  4  5

# range(start, stop, step) — counts by step
for i in range(0, 10, 2):
    print(i)
# Output: 0  2  4  6  8

You can also use range() to loop backwards by using a negative step value:

for i in range(5, 0, -1):
    print(i)
# Output: 5  4  3  2  1

Nested for loops

You can place a for loop inside another for loop. The inner loop runs its full cycle for every single iteration of the outer loop. This pattern is common when working with grids or tables.

for row in range(1, 4):
    for col in range(1, 4):
        print(f"row {row}, col {col}")

# Output:
# row 1, col 1
# row 1, col 2
# row 1, col 3
# row 2, col 1
# ... and so on

"Explicit is better than implicit." — The Zen of Python, PEP 20

Python Learning Summary Points

1. The for loop iterates over any iterable in Python — lists, strings, tuples, ranges, and more. The loop body runs once per item, and Python moves on when all items have been processed.
2. range() is the standard way to run a loop a specific number of times. Remember that the stop value is excluded: range(5) produces 0, 1, 2, 3, 4 — not 1 through 5.
3. Indentation defines the loop body in Python. Every line you want to execute on each iteration must be indented by the same number of spaces. This is not optional — it is how Python reads the structure of your code.
4. break exits the loop immediately. continue skips the rest of the current iteration. Both keywords give you fine-grained control over loop behavior without requiring you to restructure your code.
5. Nested for loops let you iterate over multi-dimensional data. The inner loop completes its full run for every single iteration of the outer loop — keep this in mind to avoid writing loops that do far more work than you intended.

The for loop is one of the most-used constructs in Python. Once it feels natural, you will reach for it constantly — to process files, transform data, validate input, and build logic of every kind. Practice by writing small loops on your own and reading the output carefully until the pattern is second nature.