An exception is an event that disrupts the normal flow of your Python program. Some examples:
KeyError – raised when a key is not found in a dictionary
IndexError - raised when you try to access an element outside the range of the list
Exception handling is error-checking code in your program that looks for a special circumstance
Exception handling is done with try-except blocks of code
try – the block of code where something could go wrong (may throw an exception)
except – the code to run if an exception happens
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