Python Examples Python Compiler ... Q&A Python Bootcamp Python Certificate Python Training ... A for loop is used for iterating over a sequence (that is either a list, a tuple, a dictionary, a set, or a string)....

for x in range(0, 3): print("We're on time %d" % (x)) While loop from 1 to infinity, therefore running forever.

A Python for loop can be used to iterate over a list of items and perform a set of actions on each item.

June 1, 2025 - In conclusion, mastering the for loop in Python 3 is essential for efficient and effective programming. We've explored how to iterate over sequences using range(), navigate through lists and dictionaries, and implement nested loops for more complex data processing.

A for-loop assigns the looping variable to the first element of the sequence. It executes everything in the code block. Then it assigns the looping variable to the next element of the sequence and executes the code block again. It continues until there are no more elements in the sequence to assign.

November 8, 2018 - A for loop tells Python to execute some statements once for each value in a list, a character string, or some other collection.

February 23, 2026 - Jane 25 Python Dev Canada >>> text = "abcde" >>> for character in text: ... print(character) ... a b c d e >>> for index in range(5): ... print(index) ... 0 1 2 3 4 · In these examples, you iterate over a tuple, string, and numeric range. Again, the loop traverses the sequence in the order of definition.

November 21, 2025 - In Python, the for loop is a versatile tool. It directly iterates over items of any sequence (such as a list or string), in the order that they appear, without requiring the indexing used in some other languages.

January 31, 2024 - Adds the ability to specify the step for incrementation. Example: range(1, 20, 2) yields 1, 3, 5, ..., 19. ... This loop iterates over each character in the string "Hello". The for loop assigns each character ('H', 'e', 'l', 'l', 'o') in turn ...

In the following example, the for loop traverses a tuple containing integers and returns the total of all numbers. numbers = (34,54,67,21,78,97,45,44,80,19) total = 0 for num in numbers: total += num print ("Total =", total) On running this code, it will produce the following output − ... Python's list object is also an indexed sequence, and hence you can iterate over its items using a for loop.

June 2, 2025 - A Python for statement runs a sequence of code over and over again, in order, executing the same code block each time. This function allows us to re-run a command X number of times until we reach the desired result.

Now let’s talk about loops in Python. First we’ll look at two slightly more familiar looping methods and then we’ll look at the idiomatic way to loop in Python. If we wanted to mimic the behavior of our traditional C-style for loop in Python, we could use a while loop:

The loop always includes start_value and excludes end_value during iteration: ... By default, the function print() prints all its arguments separating them by a space and the puts a newline symbol after it. This behavior can be changed using keyword arguments sep (separator) and end. ... print(1, 2, 3) print(4, 5, 6) print(1, 2, 3, sep=', ', end='. ') print(4, 5, 6, sep=', ', end='. ') print() print(1, 2, 3, sep='', end=' -- ') print(4, 5, 6, sep=' * ', end='.')

In this example, the loop iterates over the list of numbers with a starting value of 1. Each iteration assigns the current value from the sequence of numbers to number. The function call in the code block prints each number in the list. range() is a built-in function that creates a list of numbers starting at 0 and stopping before a specified integer. This makes the range function ideal for creating Python for loops with index variables.

March 10, 2025 - Python for loops are powerful, and you can nest more complex instructions inside of them. To demonstrate this, let's repeat the above two steps for our 'price' column, this time within a single for Loop. total_price = 0 # create a variable to store the total range number for row in ev_data[1:]: # loop through each row in ev_data starting with row 2 (index 1) price = row[2] # each car's price is found in column 3 (index 2) price = int(price) # convert each price number from a string to an integer row[2] = price # assign price, which is now an integer, back to index 2 in each row total_price += price # add each car's price to total_price number_of_cars = len(ev_data[1:]) # calculate the length of our list, minus the header row print(total_price / number_of_cars) # print the average price

Learn more about while loops in our Python While Loops Chapter. List Comprehension offers the shortest syntax for looping through lists:

For loops can iterate over a sequence of numbers using the "range" and "xrange" functions. The difference between range and xrange is that the range function returns a new list with numbers of that specified range, whereas xrange returns an ...

# iterate from i = 0 to 3 for _ in range(0, 4): print('Hi') ... Here, the loop runs four times. In each iteration, we have displayed Hi. Since we are not using the items of the sequence (0, 1, 2, 3) in the loop body, it is better to use _ as the loop variable. ... Before we wrap up, let’s put your knowledge of Python for loop to the test!