#python while loop

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Python For loop while loop

Introduction Loops are essential constructs in Python (and many other programming languages) for iterating over collections of data or executing a block of code repeatedly. There are mainly two types of loops in Python: for loops and while loops. Python While Loops A while loop is used to execute a block of code repeatedly as long as a condition is true. The basic syntax is: while…

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Python while loop

#Python while loop code

Take a minute to explain this syntax aloud to yourself or a colleague before reading the discussion below.

#Python while loop code

How does the syntax of the print(“Player ”+str(player)+“ guess?”) line of code work? What is each part of this statement doing? What numbers do you expect to see most often for c? Why? What do they represent?.What do you think the maximum value will be? What does it represent in this context?.What do you think the minimum value of c will be? What does this represent in this context?.This is a great place to make some predictions: Then, what gets printed? The value of one of the numbers? No, c, which represents how many numbers we needed to randomly calculate before we got two in a row that were the same. The program will continue to run through this loop of finding a new random number ( n), adding 1 to the count variable to keep track of how many numbers we’ve found, comparing the new number ( n) to the previous number ( t), and then exiting the loop if these values are the same or storing the new number to the previous number variable and continuing the process. (Since the conditional for this While loop is True, it will keep running until it encounters a break command.) So, what happens after the else command executes and the value of n gets saved in t? Well, we’re at the end of our loop, so the loop will circle back to its beginning. Why? So, that we can go on to find another, new number (our third number), store this to n, and then compare it to the number we found most recently (now stored in t). Now, t no longer represents the first number we found - it represents the second number we found. In this case, the value that was stored in n (in other words, the most recent random number we found) will be stored into variable t. If t and n don’t have the same value ( what are the chances?), then the program will skip down to the criteria in the else command. If this happens, the command within the If block will run - specifically, the break command will make the program exit the While loop and move on to the print command. If they are the same, that means that the program generated two consecutive numbers that are the same. Why? The program is checking to see if n (the new number) is the same as t (the previous number). Next, the program checks to see if t and n have the same value. Now c has a value of 2, representing that we have found 2 numbers so far. Also, the value of c is increased by one to show that a new number has been randomly determined. Within the loop, a new variable n is created and it’s assigned a random number from 1–6. Next, a Do While loop (modeled using a While loop with a condition of True) kicks in. c will be used as a count variable in this program to keep track of how many numbers are generated before two consecutive values are the same. This program starts by assigning a random number from 1–6 to variable t and storing the value of 1 to variable c. Explain it aloud to yourself or a colleague, then read through a sample description below. How does the do_while_loop.py program at the bottom of page 1 work? This program may not be intuitive. Tech tip: The break command can be typed in via the TI-Nspire™ keyboard. TI-Nspire™ keyboard or from Menu > Random. Tech tip: randint() can be entered via the So, randint(1,6) will return a random integer from the set. Quick refresher: How does the randint(1,6) syntax work?Īnswer: In Python, randint(a,b) returns a random integer within the inclusive range from a to b (meaning including a and b). Start by working through that activity, then read through the following discussion of main ideas from the activity. A great introduction to this loop structure can be found in Unit 4, Activity 3.

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Python while loop

PYTHON WHILE LOOP HOW TO

PYTHON WHILE LOOP FULL

PYTHON WHILE LOOP CODE

Compare this with the do while loop, which tests the condition/expression after the loop has executed. Because the while loop checks the condition/expression before the block is executed, the control structure is often also known as a pre-test loop. This repeats until the condition/expression becomes false. If it is false, then the while loop will terminate.

PYTHON WHILE LOOP CODE

If the expression is true, the code block will be executed, and after it is executed, the program returns to the logical expression at the beginning of the while statement. The condition/expression is evaluated, and if the condition/expression is true, the code within all of their following in the block is executed. When Python reaches a while loop block, it first determines if the logical expression of the while loop is true or false. The while construct consists of a block of code and a condition/expression.

2.17 Oberon, Oberon-2 (programming language), Oberon-07, or Component Pascal.

First, specify the condition as True in the while loop like this: while True : Code language: PHP (php) This allows the code block to execute for the first time. However, you can use the while loop and a break statement to emulate the do.while loop statement. In the next video, we’re going to be looking at how we can actually break out of a loop prematurely. Unfortunately, Python doesn’t support the do.while loop. And you’ll notice that it now broke out of my while loop. And if that’s the case, this is going to return False, and so my code is not going to be executed. I’ll notice that I now printed 'baz', and all that’s left is 'fizz'.Ġ2:34 So if I run this one more time, I now have an empty list. pop() method does-it just takes something out.Ġ2:20 So now I’m going to run that second list, the one that only has two things inside of it, and I’ll see what happens there. Now notice that this list has now two things in it, because that’s what the. So now whenever I go to iterate through my code, as long as there is something in this list, it’s going to return True.Ġ1:59 So I should be able to iterate over my code.Ġ2:08 And so we see I’m going to print('buzz'), and that’s that first bit.

PYTHON WHILE LOOP FULL

So first, we see our list and I am setting my variable a and I have my full list over to the side. And if we look at our variables, we see that a is now empty.Ġ1:33 Let’s use our debugger and walk it through it step-by-step. So what we see is we have buzz, then baz, then fizz. You can refer to the below screenshots python while loop multiple conditions.

PYTHON WHILE LOOP HOW TO

You’re now able to: Construct basic and complex while loops Interrupt loop execution with break and continue Use the else clause with a while loop Deal with infinite loops You should now have a good grasp of how to execute a piece of code repetitively. Here, we will use the logical operator and to join the condition. In this tutorial, you learned about indefinite iteration using the Python while loop. So, take a minute to think about what the output is going to be and how many times I’m going to iterate over this code. After writing the above code (python while loop multiple conditions), Ones you will print value 1, value2 then the output will appear as a (10, 20) (7, 15) (4, 10) (1, 5). pop() method on a.Ġ1:07 This is just going to take off the last element of my list. So for this block of code, I’m just going to print the result of performing the. So let’s now write our while loop.Ġ0:46 So because of what I just said, we can actually say while a: and then that will iterate over our while loop. But once that list becomes empty, it should return False. Whenever we evaluate a list in a Boolean context, it is going to return True if there’s any elements inside of that list.Ġ0:34 So as long as this list has those things inside of it, it’s going to return True. I’m just going to say a is equal to a list containing three words. The first thing we need to do is declare a variable. Now let’s see how we can use a list to iterate over a while loop.

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Python Loops - Learn one of the most powerful concepts in programming - TechVidvan

Python Loops - Learn different types of loops that are available in Python such as for loop, while loop, nested loop, etc with flowcharts and examples.