One of the first things I noticed when writing Python programs was that I sometimes wanted to do the same thing several times.
I could write the same line of code again and again, but that obviously wasn't a good way to program.
That's where loops came in.
The idea is simple, tell Python to repeat something for me.
for loops
I use a for loop when I want to go through a collection of items or repeat something a specific number of times.
For example, suppose I have some products:
Instead of writing four separate print() statements, Python goes through the list for me.
That was one of the first things that made loops click.
Using range()
I can also use range() when I want to repeat something a certain number of times.
For example:
This prints:
1
2
3
4
5
So range(1, 6) gives me numbers starting from 1, but stops before 6.
while loops
A while loop works a little differently.
It keeps running as long as a condition is true.
For example, I can keep asking for a PIN until the correct one is entered:
The loop keeps asking until the condition becomes false.
This helped me understand that while is useful when I don't necessarily know how many times something needs to repeat.
break
Sometimes I want to stop a loop completely.
That's what break does.
For example:
The loop stops when it reaches 6.
So even though the loop was supposed to go up to 10, break tells Python:
"Stop here."
continue
continue is different from break.
Instead of stopping the whole loop, it skips the current iteration and moves to the next one.
For example:
The output is:
1
2
4
5
The number 3 is skipped, but the loop continues.
That's the difference I had to remember:
break → stop the loop
continue → skip this round
enumerate()
I found enumerate() useful when I wanted both the item and its position in a list.
For example:
The result is:
1 Bread
2 Milk
3 Sugar
Without enumerate(), I would have to create and manage the counter myself.
A practical example
I can put some of these ideas together in a small shopping program.
Suppose I have a list of products and want to display them with numbers:
products = ["Bread", "Milk", "Sugar", "Soap"]
for number, product in enumerate(products, start=1):
print(f"{number}. {product}")
Now Python handles the numbering for me.
This is much cleaner than manually writing:
print("1. Bread")
print("2. Milk")
print("3. Sugar")
print("4. Soap")
What I understood
The main thing that finally made loops make sense to me was thinking about the question:
"Do I need to repeat something?"
If I want to go through items in a list, I can use a for loop.
If I want something to keep running while a condition is true, I can use a while loop.
If I want to stop the loop, I use break.
If I want to skip one iteration, I use continue.
And if I need the position of each item, enumerate() makes it easier.
Final thoughts
Loops seemed confusing at first because there was a lot of new syntax.
But once I saw that their main purpose is simply to avoid repeating the same code manually, they became much easier.
Instead of telling Python the same thing ten times, I can write it once and let the loop handle the repetition.
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