#For loop python code

The above code would run the outer loop, and during that loop, the inner loop would run till it finishes, then the outer one would run again.

With nested loops, the inner loop runs to completion for each time the outer loop runs let's go over how this works. Powerful Nested Loopsįinally, let's discuss the recursive awesomeness of nested loops, which add a new level of dynamic complexity. An example of this would be if the other statement would execute after completing the maximum number of iterations.Īfter the above loop runs six times, the else block would be executed and print the text, 'All Done!' to the screen. In addition, the for loop offers the else statement, which will run in the condition that the for loop can’t. The keyword print prints the value of x each time the loop runs - x being equal to the current item in the collection. The first line of code creates a variable named carCompanies and assigns it a value of an array after that, it'll start the for loop and iterate through the carCompanies array. Let's go over what the code above actually does and how it works one step at a time. So, let's check out the syntax for a Python for loop.ĬarCompanies = The Python language uses a human-readable syntax, making it easy to follow and use. So without further ado, let's jump right into this.Ĭreating a for loop sounds like a daunting task, but Python's syntax makes this easier. There is a lot to cover, but I'll keep it as short and sweet as possible. Today, we will dive into Python for loops, syntax, keywords, and more. Python is a powerful programming language, and loops are just one of its features. The truth is that it's not really like that. Lets take an example of nested for loop.Ouroboros is the snake eating its tail that's what I think of when I think of Python loops - but only because I'm overly visual. When a for loop is present inside another for loop then it is called a nested for loop. Note: The else block only executes when the loop is finished. Print('The loop has completed execution') Lets take an example: for val in range(5): The ‘else’ block executes only when the loop has completed all the iterations.

Unlike Java, In Python we can have an optional ‘else’ block associated with the loop. # displaying sum of first 5 natural numbers # iterating over natural numbers using range() # Program to print the sum of first 5 natural numbers Here we are using range() function to calculate and display the sum of first 5 natural numbers. Lets use the range() function in for loop: Python for loop example using range() function However by specifying step_size we can generate numbers having the difference of step_size. Range(start, stop, step_size): The default step_size is 1 which is why when we didn’t specify the step_size, the numbers generated are having difference of 1. Range(start, stop): generates a set of whole numbers starting from start to stop-1. Range(n): generates a set of whole numbers starting from 0 to (n-1).

However we can also use a range() function in for loop to iterate over numbers defined by range(). In the above example, we have iterated over a list using for loop. # variable to store the square of each num temporary # Program to print squares of all numbers present in a list In the body of for loop we are calculating the square of each number present in list and displaying the same. The following example shows the use of for loop to iterate over a list of numbers. Lets take few examples of for loop to understand the usage. On every iteration it takes the next value from until the end of sequence is reached. Here is a variable that is used for iterating over a. # body_of_loop that has set of statements In this guide, we will learn for loop and the other two loops are covered in the separate tutorials. In Python we have three types of loops for, while and do-while. A loop is a used for iterating over a set of statements repeatedly.