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To retrieve a single value from a dictionary that contains only one entry, you can use the key to access the value using the indexing notation. Here's an example:
my_dict = {'key': 'value'}
# retrieve the value
my_value = my_dict['key']
print(my_value) # prints 'value'
In this example, we have a dictionary with one key-value pair. We use the key 'key' to access the value 'value' using the indexing notation my_dict['key']. This returns the value, which we then assign to the variable my_value. Finally, we print my_value to confirm that we have retrieved the value 'value'.