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What is the purpose of a loop in programming?

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Updated 5 months ago

1. Word cloud
120 seconds
What is the purpose of a loop in programming?
2. Slide
60 seconds
Loops are a way to repeat an action until a certain condition is met. Python has three types of loops: for, while and nested. For loops are used to iterate (perform repeatedly) through a sequence, While loops are used to repeat an action while a certain condition is true.
Learning about Python Programming Loops
3. Slide
60 seconds
For loop: A type of loop that allows for repeated code execution until a specified condition is met. While loop: A type of loop that executes code as long as a given condition is true. Break statement: A statement used in loops to exit the loop and move on to the next iteration or statement.
4. Slide
60 seconds
"For" loops allow us to repeat code multiple times, as well as provide simpler and easier-to-read programs. When creating a for loop, specific rules that need to be followed. For example, when adding code to the for loop, you must have 4 spaces in front of the code that is part of the loop. This action indicates that the code on that line is part of the code above it.
For loop
5. Slide
60 seconds
6. Slide
60 seconds
First, we will need to use the “for” keyword. For loops always start with “for” to show that the following code is a for loop.
For Loop Step 1
7. Slide
60 seconds
Next, provide a name for the counter variable. This variable’s value increases each time the loop repeats. If you use a for loop that loops 10 times, starting with 0 and increasing by 1 each time the loop starts over, the counter variable will represent 0 in the first run, then 1 in the next run, then 2, then 3, and so on, increasing by 1 each time the loop starts over. Although a counter variable can be named anything, a tradition is to use “i”.
For Loop Step 2
8. Slide
60 seconds
Next, add the keyword “in” to show that you are about to specify how many times the loop should repeat.
For Loop Step 3
9. Slide
60 seconds
Then, we will set the number by using the range() function. The range function will count from zero up to, but not including, the number listed in the function’s parentheses. ()
For Loop Step 4
10. Slide
60 seconds
End the first line of the loop with a colon (:). Here is an example: for i in range(3):
For Loop Step 5
11. Poll
20 seconds
What is the purpose of the for loop?
  • They allow us to repeat code multiple times.
  • They can only be used once.
  • They make the program more complicated.
12. Poll
30 seconds
Which of the following for loop declarations is valid?
  • for i in range(9)
  • for i range X9
  • for i in range(9):
13. Drawings
450 seconds
Brain break: Draw an octopus flying a hot air balloon.
14. Slide
60 seconds
In Python, the 'for' loop can be used with multiple variables, allowing you to work with multiple items at once. Python's 'while' loop can also be used to generate an infinite loop, which runs until a certain condition is met.
Did you know?
15. Slide
60 seconds
. While loops repeat as long as the conditional statements within them are True. A while loop looks similar to a for loop, but it replaces the counting portion with a conditional statement. A nested loop is when one loop is put inside another loop.
While Loop
16. Slide
60 seconds
17. Open question
180 seconds
Work together in pairs: What is the difference between a for loop and a while loop in Python programming?
18. Open question
180 seconds
Work together in pairs: What are the three types of Python loops and how are they used?
19. Poll
60 seconds
What is the function of a break statement in a loop?
  • Exit the loop immediately
  • Skip to the next iteration of the loop
  • Restart the current iteration of the loop
20. Poll
60 seconds
What is another name for an infinite while-loop that never ends?
  • Endless Loop
  • Infinite Loop
  • Forever Loop
21. Poll
60 seconds
What is printed when this code runs? for i in range(3): print(i) if i == 1: break
  • 0 1 2
  • 0 2 1
  • 1 0 2

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