Source: 📖 Python Cookbook ch14.5 p574

Handling multiple exceptions

• except can be handed a tuple of exceptions
• exceptions that require specific behaviour go in their own except clause
• exceptions that share a common base class can be caught by catching the base class
• view an exception's class hierarchy by calling exception.__mro__

Multiple exceptions can be caught by one except clause by providing each exception as part of a tuple:

try:
	# Code that fails
	...
except (ZeroDivisionError, NotANumberError):		# Catches two errors
	...

Any exceptions that require specific behaviour can go into their own except clause:

try:
	# Code that fails
	...
except (ZeroDivisionError, NotANumberError):
	...
except PassedAsStringError:
	...

Another way of handling multiple errors is by catching a common base class if the exceptions in question have a common inheritance hierarchy. For example, FileNotFoundError and PermissionError both inherit from OSError, so rather than passing both of these exceptions as a tuple, you can simply pass OSError to catch them both.

try:
	...
except OSError:				# Catches FileNotFoundError and PermissionError
	...

To view an exception's inheritance hierarchy, you can print a call to the exception's __mro__ property:

print(ZeroDivisionError.__mro__)

# Prints:
'''
(<class 'ZeroDivisionError'>, <class 'ArithmeticError'>, <class 'Exception'>, <class 'BaseException'>, <class 'object'>)
'''

This means that ZeroDivisionError inherits from ArithmeticError, which inherits from Exception, etc...