How do you use loops in Python?

So, there are various contexts where for loops can be used.

1. You wish to iterate over a list consisting of elements.

L=[1, 2, 3, 4, 5]
for i in L:
    print(i, end=" ")

Output would be something

1 2 3 4 5

2. You know the number of times some operation needs to be performed. Suppose, printing each of the iterations.

for i in range(3):
    print(i)

This will give output

0
1
2

3) You have a list. But, you don’t wish to access elements of the list. But, your purpose is to just perform total iterations equal to the length of list.

L=[1, 2, 3]
for _ in range(len(L)):
    print("Hello World!")

Will give you output like

Hello World!
Hello World!
Hello World!

Now, in point 3 I have used a “_” instead of a variable. So, this can be used when you don’t have to use the variable anymore. You just wish to loop over.

I hope it makes sense! :)

EDIT

4. Using for loop for iterating over a dictionary

D={'a': 2, 'b': 3, 'c': 10, 'd': 15}
 
for key, value in D.items():
    print(key, value)
for key in D.keys():
    print(key)
for values in D.values():
    print(values)

Try and see the output ;) Name is sufficient to predict though.

>> Also you can read: How should you start learning Python?