You can think of a while loop like an if condition but the indented block of code executes more than once. However, control structures change the order of how the statements are executed and/or decide if a certain statement(s) will be run. From Wikibooks, open books for an open world ... the computer starts with the first line and then goes down from there. This loop is interpreted as follows: Initialize i to 1.; Continue looping as long as i <= 10.; Increment i by 1 after each loop iteration. A for loop is a repetition control structure that allows you to efficiently write a loop … Since range data type generates a sequence of numbers, let us take the range in the place of sequence in the above syntax and discuss a few examples to understand the python for loop … Step 2: Then ask the user to input the length of the countdown in seconds. You use count and value in this example, but they could be named i and v or any other valid Python names. Non-Programmer's Tutorial for Python 2.6/Count to 10. Hence, a loop. Here the sequence may be a string or list or tuple or set or dictionary or range. It might sound like, we might not really need a “else” inside “for” if it only gets executed at the end of for loop iteration. Any variable read using the input function is a string. When you use enumerate(), the function gives you back two loop variables:. Create a Python program to print numbers from 1 to 10 using a for loop. ; Three-expression for loops are popular because the expressions specified for the three parts can be nearly anything, so this has quite a bit more flexibility than the simpler numeric range form shown above. Codecademy is the easiest way to learn how to code. A good example of this can be seen in the for loop.While similar loops exist in virtually all programming languages, the Python for loop is easier to come to grips with since it reads almost like English.. The count of the current iteration; The value of the item at the current iteration; Just like with a normal for loop, the loop variables can be named whatever you want them to be named. Here's the source for a program that uses the while control structure: A while loop executes an indented block of code, or instructions, repeatedly while a condition is true. Any variable read using input function is a string. This value is sent as a parameter ‘t’ to the user- defined function countdown(). Python’s easy readability makes it one of the best programming languages to learn for beginners. Step 3: This value is sent as a parameter ‘t’ to the user-defined function countdown(). Let the Countdown begin with python. We will then ask the user to input the length of countdown in seconds. While loops . But, the next example will clarify bit more on what is the advantage of “else” inside for-loop. 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