When you try to access a key that doesn't exist in a dictionary, Python raises a KeyError exception. However, you can avoid this by using the get() method, which lets you specify a default value if the key is missing. Here are five examples:

1. Accessing a non-existent key without error handling:

my_dict = {'a': 1, 'b': 2}
print(my_dict['c'])  # This will raise a KeyError

2. Accessing a non-existent key with error handling:

my_dict = {'a': 1, 'b': 2}
try:
    print(my_dict['c'])
except KeyError:
    print("Key 'c' does not exist in the dictionary.")

3. Using the get() method without specifying a default value:

my_dict = {'a': 1, 'b': 2}
print(my_dict.get('c'))  # This will return None because 'c' doesn't exist

4. Using the get() method with a default value:

my_dict = {'a': 1, 'b': 2}
print(my_dict.get('c', 'Key not found'))  # This will return 'Key not found'

5. Using a default value in a dictionary comprehension:

my_dict = {'a': 1, 'b': 2}
key = 'c'
value = my_dict[key] if key in my_dict else 'Key not found'
print(value)  # This will print 'Key not found'

In examples 1 and 3, trying to access a key that isn't there directly or using get() without a default value will return None if the key doesn't exist. Examples 2, 4, and 5 show how to manage this by using a default value or error handling to prevent a KeyError exception.