Python Running Total While Loop

To do this, we need to perform the following steps: First, we'll set up the path to our shapefile:. So, the inner while loop will be executed and "*"*1 (b is 1) i. Here, a is 5 and b is 1. To find a specific topic in this guide, use ctrl+F (command+F on a Mac) to search for a keyword, or find the relevant section in the table of contents below. This is exemplified by. Now you have learned how to use a list and how to write a for loop you will see that lists and for loops go together like bread and cheese!. In Python, often referred to as a running total. The loop iterates while the. I've recently started using Python's excellent Pandas library as a data analysis tool, and, while finding the transition from R's excellent data. A for loop is used for iterating over a sequence (that is either a list, a tuple, a dictionary, a set, or a string). Historically, the Python prompt and built-in repr() function would choose the one with 17 significant digits, 0. Other types of loops exist but FOR and WHILE are nearly always provided. Python has While loops and For loops. Lists with a FOR Loop. Pretend for a minute that you do not have while. Thus your code should put 1*1 + 2*2 + 3*3 +… + 49*49 + 50*50 into total. x Python scripts or if you use cursors in ArcObjects (which has conceptually similar methods for advancing a cursor row by row). 7 Keeping a Running Total 272 5. Well, it depends. Pre-trained models and datasets built by Google and the community. It's a treasure trove of know-how about the Python programming language - check us out today!. After this you can then call the exit() method to stop the program running. This, plus the first point means you don't have to store the actual inputs anywhere. How to use? ¶ Note: Although the whole API is covered in this guide, it is not a substitute for the API documentation. By doing so, you'll not only learn more about join conditions, but see how to take the. , a dedicated web server running a Python-based web application, then measuring the program using time. In this tutorial we will look at what it does, and why it is necessary. If the list consists of numbers, one common practice is to add up all of the numbers in the list. Starting Out with Python 3rd Edition - Tony Gaddis Chapters 2-6 - Python_3rd_Edition_Tony Gaddis_Notes_2-6. Design a loop that asks the user to enter a number. Python includes a variety of types of loop, including "while" loops that continue until a condition is no longer true and "for" loops that execute code once on each element of a list. If you think about the variable total, it contains the "running total of the values so far". Clearly, then, number is incremented to 4, we hit the top of the while loop, and keep incrementing number until we hit the next prime number (5). Sounds pretty effortless and through simplicity we learn how to use another useful tool. Design a loop that asks the user to enter a number. Plus we'll see a simple program that can't be written using a for-loop. If the list consists of numbers, one common practice is to add up all of the numbers in the list. Introduction to Programming 2 Which of the follwoing is the correct format for a while loop in Python? A ariablev used to keep the running total is. This condition is usually (x >=N) but it’s not the only possible condition. TensorFlow Lite for mobile and embedded devices For Production TensorFlow Extended for end-to-end ML components. The flowchart gives the strategy we will employ --- it is a while loop. get_running_loop ¶ Return the running event loop in the current OS thread. CS1110 course website. The script should loop back if the user chooses to add another operation, and ask for another number (repeat until result) Now, i already have the arithmetic sorted, and i know i have to add an UNTIL loop, but i'm not very good with loops as i find them hard to understand. 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. dc_bikeshare_q1_2012 You can see that the above query creates an aggregation (running_total) without using GROUP BY. How does a do-while loop differ from other loops? The most important distinction is that do-while loops test a condition after executing a code block, while other loops check a condition before running the code inside. We will load the layer, loop through the features while keeping a running total of line lengths, and finally convert the result to kilometers. Video of the Day. The flowchart algorithm is easily refined into this Python program:. Keeping a running total is a good idea but take care to catch the -99 case - there's no need to add it to the total at all. The following low-level functions can be used to get, set, or create an event loop: asyncio. That means that if you want to loop the next five lines with a 'while' loop, you must put a set number of spaces at the beginning of each of the next five lines. The program should first read the number of days the collector is catchings bugs from the user (You may assume that the user will enter a non-negative integer). Counting the total amount of iterations in loop. Design a loop that asks the user to enter a number. Syntax: while ( condition is true ) { do these statements } Just as it says, the statements execute while the condition is true. Using a while loop in Python to maintain a counter and a running total Mark Hufe. We removed all the "if" statements except one, and replaced the word if with the word while. I am currently learning from the Python Programming for the Absolute Beginner book and one of the challenges is to write a program that flips a coin 100 times and tells you the number of heads and tails. The only examples I keep finding for while loops is with averaging grade. How to repeat a loop only a certain number of times? while (count > 0) {void loop One of the things to note is that the Arduino starts by running your code in. Counting how many times a loop loops. That's the entire program. There are two types of loop in Python: the for loop; the while loop; While loops are known as indefinite or conditional loops. When you're working with data in Python, for loops can be a powerful tool. The first number input by the user will be an integer that specifies how many numbers are to be averaged. " With a while loop Perl executes a test, and if the test is true it executes everything inside the curly braces (here, everything in between lines 9 and 20). In this program, we'll ask for the user to input a password. A negative value causes padding to be automatically chosen so that the total playback length matches frames (or, if frames is negative, zero padding will be added indefinitely). Python is designed to be consistent and readable. Set counter to 1, totalAge to 0, averageAge to 0, age to 0, and number to 0. While this syntax is more compact than using a while loop, there is some benefit to seeing how the next() method works, especially if you ever work with ArcGIS 9. Here are a couple of examples. Add the following lines of code, code that will display the elements of the array to the screen, code necessary to add up all of the numbers using a while loop, and code that will display the total calculated to the screen. " So far I have gotten the loop to go ten times and asks and takes the input of the user. Let's implement the last of these in Python, by asking the user for prices and keeping a running total and count of items. Notice how print 'Total Sum =', s is only run at the end. Starting Out with Python 3rd Edition - Tony Gaddis Chapters 2-6 - Python_3rd_Edition_Tony Gaddis_Notes_2-6. As the loop executes, total accumulates the sum of the elements; a variable used this way is sometimes called an accumulator. 3 The forLoop: a Count-Controlled Loop 167 5. A counter variable is used to control or keep track of the number of times a loop iterates. A Python while loop behaves quite similarly to common English usage. Then 41 comes in, then we take 9 plus 41. This is often too restrictive. To write a float, enter a decimal (even if the value being written is a whole number) - eg `3. Now, with the while loop, we can more succinctly write code that prints out "I love programming in Python!" ten times in a numbered list. It is called the while statement or a while loop. While loops. Loop through words Here we use the for loop to loop through the word computer word = "computer" for letter in word: print letter Output c o m p u t e r While Loop The while loop tells the computer to do something as long as the condition is met. 4 Calculating a Running Total Figure 5-7 Logic for calculating a running total 5-* 5. var: var reads each. empty statement * while Repetition Structure Repetition Structures Allow a program to repeat an action while a statement is true Using while Repetition The action is contained within the body of the loop Can be one or more than one action Condition should evaluate to false at some point Creates a infinite loop and program hangs * while. It's a shame python doesn't have a do. It is called the while statement or a while loop. WHILE loops repeat a set of commands until some terminating condition is met. The while loop can be found in most programming languages. The while loop has the following syntax:. To accomplish this, we could loop through all 1, 2, and 3 digit integers, testing if each is a prime number (using the isprime function). In the following example, if the average list price of a product is less than $300, the WHILE loop doubles the prices and then selects the maximum price. Python has While loops and For loops. info,2019-09-18:/blog/posts/2019-09-18-python-deep-dive-tokenizer/. While loops keep iterating until a statement becomes false. " while loops are not used as much as for loops. To put things in perspective, let’s look at 3 cases. For example when I type in a expense of $200. Discussion board where members can get started with Qlik Sense. The loop should ask for the number of bugs collected for each day, and when the loop is finished, the program should display the total number of bugs collected. It is called the while statement or a while loop. The numbers in the diagram denote which loop cycle the character was printed in (1 being the first loop, and 6 being the final loop). I want it to calculate a running total on my expenses. The condition is checked every time at the beginning of the loop and the first time when the expression evaluates to False, the loop stops without executing any remaining statement(s). return False # end puzzler_1 (word). Comparing For-Loops and While-Loops. , return running_total). How to Create Loops in Python. In addition to the other comments, there's no need to keep a running total of all the grades, you can just use the built-in sum() function at the end. Python is one of the most important programming languages used today. condition-based loops; accumulator pattern running totals; General. Python while loop to calculate sum and average. def main (): # Call an intro function so the user doesn't have to # press Enter to. running of a loop in exactly the same way that you would keep a mental note of the total so far as you added up a column of numbers by hand (does anyone still do that?). There are two different kinds of loops in Python: the for loop and the while loop. x Python scripts or if you use cursors in ArcObjects (which has conceptually similar methods for advancing a cursor row by row). Download with Google Download with Facebook or download with email. You could use a for loop with a huge number in order to gain the same effect as a while loop, but what's the point. 1 Example- Sum Primes Let’s say we wanted to sum all 1, 2, and 3 digit prime numbers. There are two types of loops in Python: while loops and for loops. For every time the while loop runs, the value of the counter is increased by 2. (Note: Guido's already told me off-list that he doesn't like the way this spelling reads, but I wanted to share it anyway since it addresses one of the recurring requests in the PEP 572 discussions for a more targeted proposal that focused specifically on the use cases that folks had agreed were reasonable potential use cases for inline assignment expressions. When the last item is entered, the program gives the grand total, number of items, and average price. py ANALYSE THE WAY THE WHILE LOOP WORKS. I can't seem to get my file to total up the numbers from my text file when I run the prog Info from txt file Charleston, St. To do this, we need to perform the following steps: First, we'll set up the path to our shapefile:. Notice how print 'Total Sum =',s is only run at the end. Maybe I'd like it better if the utilities came last. Within the loop, you can accept input from the user (possibly using the input function), add it to the data structure, and update your running total variable. Like the assignment says: use a for loop and use two variables, one to keep track of what the number was you got from input and another to keep track of the total. To find a specific topic in this guide, use ctrl+F (command+F on a Mac) to search for a keyword, or find the relevant section in the table of contents below. Once the condition bec. popup = a? One possibility is that your popups are simply being garbage collected since you don't store any references to them. A while loop is executed in the following manner: If the test is false, go to step 4. HELP PLEASE: Python program that uses a while loop to multiply integer factors entered by the user. Simple while Loops¶ Other than the trick with using a return statement inside of a for loop, all of the loops so far have gone all the way through a specified list. Computers in Engineering Pseudocode and C Language Add this grade into the running total zAny for loop could be re-written as a while loop. A Python while loop behaves quite similarly to common English usage. The Event-Controlled while loop In this while loop an action is repeated until a certain event occurs. - ritchieng/python-for-everybody. This practice of replacing explicit loops with array expressions is commonly referred to as vectorization. Hint: Copy your solution to "Problem 5: Multiple factorials", then modify it. Accumulator The variable used to keep the running total is called a( n ) ________. Please try again later. Statements indented under a 'while' keyword are executed as long as the condition attached to the 'while' keyword evaluates to True. while expression, statements, end evaluates an expression, and repeats the execution of a group of statements in a loop while the expression is true. Let’s take a look at a few examples of how for-loops and while-loops can be used to solve the same problems. When you include three script blocks in this way, PowerShell runs the first block before the first loop, runs the second block one time for each loop, and runs the third block after the last loop. In other words, to loop (HINT!!!) while (BIG HINT!!!) you tell it the program should still run. Notice how print 'Total Sum =',s is only run at the end. I was trying to do a budget analysis with python. This is easily done with a loop. • Sometimes one is a more convenient choice than the other. Rubber Mask, Rock & Roll Legend!! Illusive,UNFINISHEDWOODCO Oversized Unfinished Wood Letter, 46cm , Theta. A posttest loop will always execute at least once. Also, keep in mind your program will crash if you enter a value that can't be converted to a float (such as a text string). Write a program that reads a specified number of floating point numbers from the user and prints their average. In the case of a for loop, the commands are executed a fixed number of times, whereas in a while loop the commands are executed until some specified condition is met. (Often known as an “ac- while-loops then. Playing with Python is a great deal of fun. This is why we should always use the shorthand syntax, as shown in the first statement – Python will then do the implicit cast for us. To loop through a list of numbers, we just have to create a list of numbers and pass it as an argument to the. A While loop should then prompt the user to enter each of his or her expenses for the month and keep a running total. To do this,. Let's implement the last of these in Python, by asking the user for prices and keeping a running total and count of items. Each (duplicates the current sign so it can be used for the first term inside the new scope. Let’s examine the program listed in example 9. When the loop finishes, the program should display the amount that the user is over or under budget. The syntax of the while loop in the simplest case looks like this: while some condition: a block of statements Python firstly checks the condition. If a digit is detected, the program adds the value to the running total of the scores variable. The while loop. Learn how to package your Python code for PyPI. The API documentation can be found in all of the source files, and is formatted to be accessible with pydoc. A running total is a sum of numbers that accumulates with each iteration of a loop. Does anything change if you add extra lines self. Some programming need a running total so it keeps summing up (integers) and it goes up each time you meet the condition or correct answer if you are doing a quiz. continue:immediately begin the next loop iteration. running total during each loop iteration. Variable names can be any length. Accumulator The variable used to keep the running total is called a( n ) ________. 1 the while Loop 157 In Python, while total < 10 : Like this hamster who can't stop running in the treadmill, an infinite loop never ends. Last step, extracting the data I want. table library frustrating at times, I'm finding my way around and finding most things work quite well. Pandas - Python Data Analysis Library. A while loop says "while this thing is true, execute this stuff. There are three different types of Event-Controlled while loops. Again we yield the value of number to the for loop in solve_number_10. But once the user types your name, the condition of the while loop will be 'your name' != 'your name', which evaluates to False. The loop should iterate 10 times and keep a running total of the numbers entered. A counter variable is used to control or keep track of the number of times a loop iterates. The Process. Python Forums on Bytes. For example, to sum consecutive pairs taken from the first 6 integers:. The user should be allowed to continue entering values until he/she enters a zero to stop. If you don't know the total number of iterations, a while-loop is often the best choice. Now, with the while loop, we can more succinctly write code that prints out "I love programming in Python!" ten times in a numbered list. set running_total to equivalent to using imperative language control structures like the "for" and "while" loops. Maintaining a counter and computing a running total. If you think about it, this will only be the case the first time a valid value is entered. Accumulating Totals in a Loop. Hint: Copy your solution to "Problem 5: Multiple factorials", then modify it. We could simply remember each number as the user entered it and use built-in functions to compute the sum and count at the end. 4 Calculating a Running Total Figure 5-7 Logic for calculating a running total 5-* 5. This article is only describing the easier option via GROUP BY. What is while loop in Python? The while loop in Python is used to iterate over a block of code as long as the test expression (condition) is true. Loops in Java | Java for loop with java while loop, java for loop, java do-while loop, java for loop example, java for loop programs, labeled for loop, for each loop or advanced for loop, java infinite for loop example, java simple for loop, nested for loop with concepts and examples. if you have a loop which gets your data, then keeping a running total is easy : [code]total = 0 while True: answer = input('Provide the next data item (or \'exit. This condition is typically expressed by the comparison between a control variable and a value, by using greater than, less than or equal to, but any expression that evaluates to a logical value. Using a While loop and IF logic. Let’s examine the program listed in example 9. The loop should iterate 10 times and keep a running total of the numbers entered. , a dedicated web server running a Python-based web application, then measuring the program using time. In Python, often referred to as a running total. Notice how print 'Total Sum =',s is only run at the end. As the loop executes, total accumulates the sum of the elements; a variable used this way is sometimes called an accumulator. Sentinel-controlled loops - A sentinel variable is initialized to a specific value. Supervise children closely!. Let’s look at the while statement first. Again, from Programming 101, we all know that in a “while” loop, a condition is evaluated first and if it returns true then the statements inside the “while” loop execute. So this is an example of a four-line Python program that has four basic steps. Study Flashcards On Python Final at Cram. python pygame. There is another Python statement that can also be used for iteration. 2 The whileLoop: a Condition-Controlled Loop 158 5. 2 The whileLoop: a Condition-Controlled Loop 158 5. var1 = 2 while var1 < 32: var1 = var1 * 2 print var1 print "Exited while loop. Let's implement the last of these in Python, by asking the user for prices and keeping a running total and count of items. Hint: don't try to work the very first "1 +" into your loop; do it outside the loops (either at the very beginning or the very end of the outer loop). Hello everyone, am back to discuss a new python program. In this article, we will show you, How to write a C Program to calculate the Sum and Average of N number using For Loop, While Loop and Do While Loop. Obvious mistakes, but the Zelle book does a poor job of explaining the loops. 1, Python (on most systems) is now able to choose the shortest of these and simply display 0. 7 Useful Arithmetic Operators in MS Access that you should know [Operator Types 1 of 5] Posted on October 14, 2012 | 2 Comments As discussed in the earlier post ‘ Applying Criteria in MS Access ’, you will now be using and analyzing in details the various operators that are available in MS Access. Domoticz_LWRF_EnergyMon. If you want to repeat a certain number of times, use a for loop. Paho Python MQTT Client-Understanding The Loop When writing code using the Paho Python client you would have had to use the loop() function. The only problem I am having is I can't get a running total within the loop. Running a Function in Parallel with Python. 4 Calculating a. Step 4: Above the Loop symbol, add an Input symbol that asks the user how many ages they want to enter. In this tutorial, we will show you how to loop a dictionary in Python. We can do this with the following code: This is called a while loop. n = 5 while n > 0: print n n = n-1 print 'Blastoff!' You can almost read the while statement as if it were English. The while loop, set in the middle of the figure above, is made of an initialization block as before, followed by a logical condition. Power Query Formula Language (also known as M language) is sometimes difficult to get your head around. They set up an infinite loop that runs until the user does something to end the loop. This article explains how to calculate Sum (Total) of DataTable Columns using the following two methods. 5 The While…. When the condition returns false, the control comes out of loop and jumps to the next statement after the. Plus we'll see a simple program that can't be written using a for-loop. py # Purpose: Example: how to use a loop within a loop # a nested while loop # Programmer: Anne Dawson # Course: CSCI120A, CSCI165 # Date: Wednesday 27th June 2007, 9:08 PT print ("This is the start of the program") x = 1 while (x 6): print # prints a new line print ("x = " + str(x),) # the , forces printing of the next item # to. In Python, while loops are constructed like so: while [a condition is True]: [do something] The something that is being done will continue to be executed until the condition that is being assessed is no longer true. One other point is that the code to be executed if the conditions are met, MUST BE INDENTED. You will be altering your 12 times table program. As the loop executes, total accumulates the sum of the elements; a variable used this way is sometimes called an accumulator. Functional Programming with Python 7. Add messages to. The loop should iterate 10 times and keep a running total of the numbers entered ? Design a While loop that. This is not BASIC; calling main does not take you back to the start - it creates a whole new main function on the stack, eating up memory, and then does it again when you call main again, and then again, and again, and again, each time eating up more and more of the stack, until you run out of memory. Java Loops & Methods. for key in dict: 1. This section also introduces the first way to get input from your program's users. For example, to sum consecutive pairs taken from the first 6 integers:. Therefore I wanted to find a clear and simple method for tracking how far through a for loop is. I am trying to write a program that will use the for loop to find the sum, and average of 10 numbers a user enters. Keep a global running total and a stack of signs (+1 or -1), one for each open scope. The underlying logic of Python for loops. The Python2orPython3 page provides advice on how to decide which one will best suit your needs. Obvious mistakes, but the Zelle book does a poor job of explaining the loops. The major difference between while and for loop is that, in python for loop we know the number of iteration required to break the loop. Less than 10: This while-loop continues as long as the variable i has a value less than 10 when the statement is encountered. wrap_socket. Starting Out with Python - 2nd Edition. In this article, we will learn how to use Python's range() function with the help of different examples. Let's see one of the examples using "while. Here we learn how to sum all the elements in a list quite easily. Let’s create a small program that executes a while loop. For instance, typing % timeit fib(20) in a new cell and executing it outputs. When do I use them? While loops, like the ForLoop, are used for repeating sections of code - but unlike a for loop, the while loop will not run n times, but until a defined condition is no longer met. Plus we'll see a simple program that can't be written using a for-loop. The loop goes over all input fields and prints the running total (s) of the numbers. To stop code execution in Python you first need to import the sys object. A decent proxy for the amount of work done by the algorithm would be the number of pivot comparisons. 4 Calculating a Running Total Figure 5-7 Logic for calculating a running total 5-* 5. That means that if you want to loop the next five lines with a 'while' loop, you must put a set number of spaces at the beginning of each of the next five lines. Counting the total amount of iterations in loop. With the knowledge acquired using Python, students gain confidence in their skills and learn to recognize the logic behind developing high-quality programs. For example, to sum consecutive pairs taken from the first 6 integers:. Python is becoming a top choice for the language, but you still have to have them work with the language and understand core concepts like loops, variables, classes, and more. Notice how print 'Total Sum =', s is only run at the end. So before the loop starts total is zero because we have not yet seen any values, during the loop total is the running total, and at the end of the loop total is the overall total of all the values in the list. A while loop says "while this thing is true, execute this stuff. Loop through words Here we use the for loop to loop through the word computer word = "computer" for letter in word: print letter Output c o m p u t e r While Loop The while loop tells the computer to do something as long as the condition is met. a while loop executes instructions repeatedly while a condition is true. You can see that done in this example with the variables "healthmonths" which is counting the number of non-zero inputs, and "nveggies" which is maintaining a running total. blocking (bool, optional) – Wait for playback to finish before returning. Here, statement(s) may be a single statement or a block of statements. The function uses an accumulator variable (total) to compute a running total of all the numbers in the list by starting with 0 0 0 and adding each number in the list. Python loops cheat sheet. The while loop can be found in most programming languages. Python is becoming a top choice for the language, but you still have to have them work with the language and understand core concepts like loops, variables, classes, and more. Python Exercises, Practice and Solution: Write a Pythonprogram to calculate the sum and average of n integer numbers (input from the user). The while statement only affects the lines that are tabbed in (a. py; Python - Recursion Mystery Function Calling with parameters. Greatly appreciate if any one can help me with this small programming challenge for a newbie. Set total to zero Set grade counter to one While grade counter is less than or equal to ten Input the next grade Add the grade into the total Set the class average to the total divided by ten Print the class average End. There are times when you will want to change the typical flow of control of the loop body itself. Design a loop that asks the user to enter a number. Next, it will ask the user to enter individual. Python, we - as if you typed these four lines into a file and then told Python to execute them. Syntax of while Loop in Python while test_expression: Body of while. a for-loop or a while-loop; Although you do not know how many iterations you loop will run before the program starts running, once you have chosen your random integer, Python knows exactly how many iterations the loop will run, so either a for-loop or a while-loop will work. When the loop finishes, the program should display the amount that the user is over or under budget. Tha tiey yn number of days. e, "*" will be printed and b will become 2 and a will become 4. I want it to calculate a running total on my expenses. For example, if we are trying to calculate the factorial of a number, we can use a loop: num = 5 # Number to compute factorial of fact = 1 # Running product of the factorial while num > 1: # Loop until we get down to 1 fact = fact*num # Multiply running total by number num = num - 1. 4 Calculating a Running Total 179 5. While Loop. Although its exact function differs from language to language, it is mostly used to perform an action provided certain conditions are met. 13 (High Sierra), which has Python 2. Introduction to Programming 2 Which of the follwoing is the correct format for a while loop in Python? A ariablev used to keep the running total is. 7 Keeping a Running Total 272 5. Calculating a running total. One way to get the sum of all the values in a list is to utilize the built-in sum() function in Python. In this tutorial, we're going to dive headfirst into for loops and learn how they can be used to do all sorts of interesting things when you. Simple while Loops¶ Other than the trick with using a return statement inside of a for loop, all of the loops so far have gone all the way through a specified list. To square the value of n, we will repeat the process of updating a running total n times. Now we have to repeat a lot of calculations with the formula. The function should keep separate running totals of the positive values and the negative values. Design a for loop that displays the following set of numbers:0,10,20,30,40,50,…1000 Declare number as integer For number as integer = 0 to 1000 step 10 Display number End For 4. Introduction to Problem Solving and Programming in Python the grade for each student and keep running total clause with a loop (in Python) • When used with. Python for loops are really foreach loops - they operate on a list of items. Then, it'll go back and try the test again, and if it's true again, it'll execute all that code again, and so on. Performing column level analysis is easy in pandas. I am pretty green with java so please walk me through my errors. Creating loops is relatively easy task with only few critical steps: Get your data; Group as AllRows on desired level. 2 To loop every key and value from a dictionary – for k, v in dict. Then 41 comes in, then we take 9 plus 41. Syntax: while ( condition is true ) { do these statements } Just as it says, the statements execute while the condition is true. →also applies only to inner-most loop when loops are nested both are available with for-loops and while-loops. Click here. In this tutorial we will look at what it does, and why it is necessary. The loop iterates while the. Functions & Modules In Python 4.