Here is a formatted explanation to make it easier to read and understand:

**Understanding the Code**

The given code defines a function called `print_seconds` that takes three arguments: `hours`, `minutes`, and `seconds`. It calculates the total number of seconds from these inputs and prints the result.

```python
def print_seconds(hours, minutes, seconds):
total_seconds = hours * 3600 + minutes * 60 + seconds
print(total_seconds)

print_seconds(1, 2, 3)
```

**Explanation:**

1. **Function Definition:**
- `def print_seconds(hours, minutes, seconds):` is the definition of the function. It expects three parameters: `hours`, `minutes`, and `seconds`.

2. **Calculating Total Seconds:**
- `total_seconds = hours * 3600 + minutes * 60 + seconds`:
- `hours * 3600`: Converts hours to seconds (since 1 hour = 3600 seconds).
- `minutes * 60`: Converts minutes to seconds (since 1 minute = 60 seconds).
- `seconds`: Already in seconds, so it's added directly.

3. **Printing the Result:**
- `print(total_seconds)`: This line prints the total calculated seconds.

4. **Calling the Function:**
- `print_seconds(1, 2, 3)`: This line calls the function with 1 hour, 2 minutes, and 3 seconds.

**Clarifications:**

- The `hours`, `minutes`, and `seconds` are not strings. They are numerical values (integers), allowing for mathematical operations.
- When you multiply `hours` by 3600, `minutes` by 60, and add `seconds`, you are simply converting everything to seconds.

**Example Calculation:**

For `print_seconds(1, 2, 3)`:

- 1 hour = 3600 seconds
- 2 minutes = 120 seconds
- 3 seconds = 3 seconds

So, the calculation is: `3600 + 120 + 3 = 3723 seconds`, which matches the output.