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KeyError.` A dictionary can cause a KeyError to occur. This happens due to incorrect use of the dictionary. We can prevent the KeyError in most cases by using the get() method on the dictionary.`Example.` This program causes a KeyError to be thrown. The dictionary contains just three entries—these have the keys "a", "b" and "c". We try to access a key "d" but it does not exist. And a KeyError is encountered.`Next,` we trap the KeyError in a try-except construct. We print an error message in the except-block. And finally, after handling exceptions, we access key "d" with the get() method. This is safe. No exception is raised. `Error `error-python`A KeyError is avoidable` in Python programs. We fix the problem by using a safe method, such as get(), instead of directly accessing the key. We can only directly access a key if we are sure it exists. `If any direct accesses occur in your program, using a try-except block may be worthwhile if your code is new or untested.`Summary.` The KeyError is an avoidable exception in Python. It occurs when a dictionary is incorrectly used. We saw two ways to prevent this error. We used a try-except statement. And we replaced the value access with a get() method call. `Dictionary `dictionary-python

456 6# C5 d5 with three entries. 65s5{"a" : 1, "b" : 2, "c" : 3}6 # Using the 5 directly can cause an error. 6try: 45(5s[6"d"6]) except 6KeyError6: 45("6KeyError encountered6")6 # We use get5safely get a 5. 65(5s.6get6(6"d"6)) 6 6KeyError encountered6 None6

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