# I Learned About Python Loops Today

As part of my Python learning journey, today was all about **loops** — a core concept that allows us to repeat tasks efficiently. I dove into `while` loops, `for` loops, and learned about the `break` and `continue` statements. I even got to write some small programs that helped me understand them better. Here’s a recap of what I learned!

### Understanding `while` Loops

The `while` loop in Python keeps running **as long as the condition is** `True`. One key thing I learned is that:

> 🔑 **You must initialize your loop variable before the loop starts.**

That’s because the loop condition depends on it. Here's a simple example of using a `while` loop to print even numbers between 0 and 20:

```plaintext
even_numbers = 0

while even_numbers <= 20:
    print(f"even....{even_numbers}")
    even_numbers += 2
```

Another way to achieve the same result with a conditional check:

```plaintext
count = 0

while count <= 20:
    if count % 2 == 0:
        print(count)
    count += 1
```

### Exploring `for` Loops

A `for` loop is used to iterate over a sequence — like a list, tuple, or range. Here’s how I printed even numbers from 1 to 100 using a `for` loop.

```plaintext
# Method 1: Using if condition
for i in range(100):
    if i % 2 == 0:
        print(i)
```

But then I learned a better way to avoid using an `if`:

```plaintext
# Method 2: Using step in range
for i in range(0, 100, 2):
    print(i)
```

The `range(start, stop, step)` function makes it super clean and efficient!

### `break` and `continue` in Loops

Next, I learned about two important control statements:

* `continue`: Skips the current iteration and moves to the next one.
    
* `break`: Exits the loop entirely when a condition is met.
    

I applied `continue` in a real-world inspired task: **calculating the total price of a shopping cart**, which had an invalid item (a string).

Here’s the code I wrote:

```plaintext
cart = [10, 20, 30, "five", 70, 100]
total = 0

for item_price in cart:
    if isinstance(item_price, str):
        continue  # Skip non-numeric item
    total += item_price

print(f"The total cost is: {total}")
```

✅ This program loops through the cart, skips the `"five"` (which is a string), and calculates the total of the numeric items.

Today's lesson gave me a solid foundation in Python loops. I now understand:

* Why initialization is key in `while` loops
    
* How to make `for` loops cleaner using `range()`
    
* The usefulness of `break` and `continue` in controlling the flow of loops
    

I'm excited to keep building on this and use loops confidently in real projects.

Next, I plan to dive into **functions** and **lists**, and see how they work together with loops to make programs more dynamic.