What happens if you use 'try' without 'except' in a block of code?

When you use 'try' without an accompanying 'except' block in Python, an error will indeed occur. The 'try' block is specifically designed to catch exceptions that may occur during its execution. When an error arises inside the 'try' block, Python expects a corresponding 'except' block to handle the exception.

Failing to provide an 'except' (or any other means of handling the exception, such as 'finally' or 'else' in a broader context) results in Python raising an unhandled exception. This is because, without 'except', there is no defined behavior for the error, causing the program to terminate and print out a traceback of the error, indicating the type of exception that occurred and where it happened in the code.

Understanding this concept is critical for effective error handling in programs, ensuring that you anticipate potential problems and manage them appropriately to maintain a robust application.