TypeError: sequence item 0: expected str instance, bytes found - Python String Join Error

The error message 'TypeError: sequence item 0: expected str instance, bytes found' indicates that the current_data variable contains bytes instead of strings. The join() function in Python requires a sequence of strings as input, so you need to convert the bytes to strings before joining them.

Here's an example of how you can decode the bytes to strings before joining:

data_string = ''.join(data.decode('utf-8') for data in current_data)

In this code, each data element in current_data is decoded using the UTF-8 encoding and then joined together to form the data_string. This ensures that the join() function receives a sequence of strings, resolving the error.