can only concatenate tuple (not "int") to tuple

This error occurs when you try to concatenate an integer value to a tuple using the + operator. In Python, tuples are immutable, which means that you cannot modify them once they are created. Therefore, when you try to concatenate an integer to a tuple using the + operator, Python throws a TypeError because it does not know how to merge an integer with a tuple.

To fix this error, you need to convert the integer value to a tuple before concatenating it with the original tuple. You can do this by enclosing the integer value in parentheses to create a one-element tuple. Here's an example:

t = (1, 2, 3)
i = 4
t = t + (i,)  # Convert i to a tuple before concatenating
print(t)  # Output: (1, 2, 3, 4)

In this example, we create a tuple `t` with three elements. We then create an integer `i` with the value 4. To concatenate `i` to `t`, we convert `i` to a tuple by enclosing it in parentheses and adding a comma after it. We then use the + operator to concatenate the two tuples and assign the result back to `t`. Finally, we print the updated `t` tuple, which now contains four elements.