We then briefly explained what the two built-in python methods, range() and enumerate(), do in for loops. We went over the basic syntax that makes up a for loop and how it works. I hope you enjoyed this basic introduction to the for loop in Python. Starting with the technical definition of for loops: Like all the other functions we have seen so far in the video tutorials, for loop. With Python, you can use while loops to run the same task multiple times and for loops to loop once over list data. The line enumerate(groceries) lets us iterate through the sequence and keep track of the index of the value and the value itself.grocery is the value of the item at the current iteration.
On each iteration of a for loop, a temporary value is assigned to a variable.
Python for loop code#
You don't write the same block of code more than once. A Python for loop can traverse over a list of items and perform a series of actions on each one. Writing for loops helps reduce repetitiveness in your code, following the DRY (Don't Repeat Yourself) principle. What is a for loop in Python?Ī for loop can iterate over every item in a list or go through every single character in a string and won't stop until it has gone through every character. You repeat certain code instructions for a set of values you determine, and you perform actions on each value for a pre-determined number of times. Specifically, a for loop lets you execute a block of similar code operations, over and over again, until a condition is met. Loops let you control the logic and flow structures of your programs.
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