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In Python, and many other programming languages, you will need to loop commands several times, or until a condition is fulfilled. It is easy, and the loop itself only needs a few lines of code.
Things You Should Know
- If you are using IDLE, make sure all subprograms are off.
- For a loop that goes for a definite amount of times, you will need a for loop, and for a loop that goes on forever you'll need a while loop.
- You can use the break command to forcibly stop a loop.
- Remember the "if", "elif" and "else" words for your loops. They are useful keywords that you can use on your on your loop.
Steps
Community Q&A
- QuestionHow do you do a nested loop?
Adam BlalockCommunity AnswerHere is a loop within a loop in Python: x = [0,1,2,3,4], y= [10,11,12,13]. For i in x: For ii in y: print i + ii. (Make sure to do it as a single tab before the second "For" and two tabs for the "print" statement.) - QuestionWhat about web development?
Community AnswerYou need to learn about Django, the Python framework for web development. - QuestionHow do you use a while loop to repeat a calculator program?
Community AnswerFirst create a function. For example, if you wanted to square numbers 1 through 100 and print the results to the screen, I would write: def square(x): return x*x for i in range(1, 101): # stop = 101 because the stop value is not included. This will go from 1-100. print(square(i)).
Video
Tips
- You can exit a loop prematurely with the break command. This might be needed, for example, if you're iterating over a list to find something and can stop looking once you've found it.Thanks
- You can use the continue command to skip to the top of the loop. This is useful if you wanted to skip certain code if a condition is met.Thanks
- Avoid using the while True loop without any "break" commands or keywords that end it.Thanks
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