A Python code only runs the except block when _____.

The correct answer highlights that the except block of a try-except structure in Python is specifically designed to handle exceptions that occur during the execution of the try block. When an error or exception is raised within any of the statements inside the try block, control is transferred immediately to the except block.

This mechanism allows programmers to anticipate potential runtime errors, such as division by zero or file access issues, and provide a controlled response to them, thereby preventing the program from crashing unexpectedly. If no errors occur in the try block, the except block is skipped entirely.

In contrast, if any of the other options were considered:

• The first choice implies that the except block triggers after all statements in the try block have run, which is incorrect because the except block only activates if an error is encountered during that execution.

• The second choice suggests that the programmer can manually trigger the except block, which is not the case; except blocks respond to exceptions, not direct calls.

• The third choice states that an error can occur anywhere in the code, which is misleading, as the except block only responds to errors specifically within the try block that precedes it.

Thus, the accurate answer reflects the intended design of error handling in Python programming.