Final answer:
The provided code snippet can be modified to catch specific types of errors and print different messages based on the type of error encountered.
Step-by-step explanation:
The code snippet provided can be modified to print 'A known error occurred' if any NameError, KeyError, or IndexError is caught, and 'An unknown error occurred' if any other type of error is caught. This can be achieved by using the try-except block in Python.
An example of the modified code:
try:
some_function()
except (NameError, KeyError, IndexError):
print('A known error occurred')
except:
print('An unknown error occurred')
In this code, the try block attempts to execute the some_function code. If any of the specified exceptions are raised, the first except block is executed. If any other type of exception is raised, the second except block is executed.