What is col, 2 vs 6, with example please?

In Python, the `col` function is used to extract a specific column from a 2D list or array. The first argument specifies the column to extract, starting from 0.

For example, consider the following 2D list:

```python
matrix = [
[1, 2, 3, 4],
[5, 6, 7, 8],
[9, 10, 11, 12]
]
```

If we want to extract the second column (index 1) using `col` function with `2` as the first argument, we can do the following:

```python
def col(matrix, col_num):
return [row[col_num] for row in matrix]

result = col(matrix, 1)
print(result)
```

Output:
```
[2, 6, 10]
```

Similarly, if we want to extract the sixth column (index 5) using `col` function with `6` as the first argument, we can do the following:

```python
result = col(matrix, 5)
print(result)
```

Output:
```
IndexError: list index out of range
```

In this case, since there are only 4 columns in the matrix, trying to extract the sixth column will result in an `IndexError` because it is out of range.

col, 2 vs 6

In HTML, the `col` tag is used to specify the column properties of a table. The `colspan` attribute specifies the number of columns that a cell should span.

col, 2

This means that the cell will span 2 columns. For example:

```html

Cell 1	Cell 2

```

This will create a table with 2 columns. The first row will have a single cell that spans both columns.

col, 6

This means that the cell will span 6 columns. For example:

```html

Cell 1

```

This will create a table with 6 columns. The first row will have a single cell that spans all 6 columns.