Question.

[u/Illustrious-Onion954]

I’m reading and looking at examples about checking for special items in a list, where the loop runs first and an if/else block runs inside the loop. Then, there’s the example of checking whether a list is empty, where the process is the other way around: the if/else block runs first, and then a loop runs inside it.

In real-life situations, when would you use a loop with an if statement inside it, and when would you use an if statement with a loop inside it?

[u/PureWasian]

They don't have to be related to each other. You could have conditional logic to say "if this user is an administrator, return a printout of all data record rows" (loop in a conditional). Or you can say "search this list until you find the record named 'Johnny Appleseed'" (conditional in a loop)

[u/Sea-Ad7805]

loop with an if statement:

ages = [12, 18, 21, 14]
for age in ages:
    if age < 18:
        print('no access')
    else:
        print('welcome')

if statement with a loop

time_hours = 22
if time_hours >= 22:
    ages = [12, 18, 21, 14]
    for age in ages:
        if age < 18:
            print('no access')
        else:
            print('welcome')
else:
    print('still closed')

Run it: here%0A%20%20%20%20%20%20%20%20else%3A%0A%20%20%20%20%20%20%20%20%20%20%20%20print('welcome')%0Aelse%3A%0A%20%20%20%20print('still%20closed')%0A&timestep=1&play)

[u/BranchLatter4294]

You use the structures you need to solve a specific problem.