A dictionary is a collection which is unordered, changeable and indexed. In Python dictionaries are written with curly ( { } ) brackets, and they have keys and values. Keys are unique within a dictionary while values may not be. The values of a dictionary can be of any type, but the keys must be of an immutable data type such as strings, numbers, or tuples. To access dictionary elements, you can use the familiar square ( [ ] ) brackets along with the key to obtain its value.
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You can change the value of a specific item by referring to its key name or you can use methods to manipulate dictionary key values.
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Python includes many built-in methods but here we just adding some of the following built-in methods to manipulate dictionaries :
You can loop through a dictionary by using a for loop. When looping through a dictionary, the return value are the keys of the dictionary, but there are methods to return the values as well.
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To determine if a specified key is present in a dictionary use the in keyword.
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