Prefill textfield with text and variables

[robStacks]

How can i prefill a textfield with strings and variables combined?
This code gets me an expected string error:

if delta.degrees < 0:
            sometext = ('B:', int(delta.degrees + 360), 'D:', int(delta.magnitude))
        else:
            sometext = ('B:', int(delta.degrees), 'D:', int(delta.magnitude))

        tv['textfield1'].text = sometext

What am i doing wrong?

[ccc]

Those values are tuples in the code above.

sometext = str(('B:', int(delta.degrees), 'D:', int(delta.magnitude)))

sometext = f'B: {delta.degrees}, D: {delta.magnitude}'