Dictionaries in Java

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A dict is an unordered collection of zero or more key value pairs whose keys are object references that refer to hashable objects, and whose values are object references referring to objects of any type Dictionaries are mutable, so we can easily add or remove items, but since they are unordered they have no notion of index position and so cannot be sliced or strided
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API stands for Application Programming Interface, a generic term used to refer to the public methods and properties that classes provide, and to the parameters and return values of functions and methods For example, Python s documentation documents the APIs that Python provides
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The dict data type can be called as a function, dict() with no arguments it returns an empty dictionary, and with a mapping argument it returns a dictionary based on the argument; for example, returning a shallow copy if the argument is a dictionary It is also possible to use a sequence argument, providing that each item in the sequence is itself a sequence of two objects, the rst of which is used as a key and the second of which is used as a value Alternatively, for dictionaries where the keys are valid Python identi ers, keyword arguments can be used, with the key as the keyword and the value as the key s value Dictionaries can also be created using braces empty braces, {}, create an empty dictionary; nonempty braces must contain one or more commaseparated items, each of which consists of a key, a literal colon, and a value Another way of creating dictionaries is to use a dictionary comprehension a topic we will cover later in this subsection Here are some examples to illustrate the various syntaxes they all produce the same dictionary:
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d1 d2 d3 d4 d5 = = = = = dict({"id": 1948, "name": "Washer", "size": 3}) dict(id=1948, name="Washer", size=3) dict([("id", 1948), ("name", "Washer"), ("size", 3)]) dict(zip(("id", "name", "size"), (1948, "Washer", 3))) {"id": 1948, "name": "Washer", "size": 3}
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Dictionary d1 is created using a dictionary literal Dictionary d2 is created using keyword arguments Dictionaries d3 and d4 are created from sequences, and dictionary d5 is created from a dictionary literal The built-in zip() function that is used to create dictionary d4 returns a list of tuples, the rst of which has the rst items of each of the zip() function s iterable arguments, the second of which has the second items, and so on The keyword argument syntax (used to create dictionary d2) is usually the most compact and convenient, providing the keys are valid identi ers Figure 35 illustrates the dictionary created by the following code snippet:
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d = {"root": 18, "blue": [75, "R", 2], 21: "venus", -14: None, "mars": "rover", (4, 11): 18, 0: 45}
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Dictionary keys are unique, so if we add a key value item whose key is the same as an existing key, the effect is to replace that key s value with a new value Brackets are used to access individual values for example, d["root"] returns 18, d[21] returns the string "venus", and d[91] causes a KeyError exception to be raised, given the dictionary shown in Figure 35 Brackets can also be used to add and delete dictionary items To add an item we use the = operator, for example, d["X"] = 59 And to delete an item we use the del statement for example, del d["mars"] will delete the item whose key is mars from the dictionary, or raise a KeyError exception if no item has that
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'mars' (4, 11) 18 0 -14 None 45 'blue' [75, 'R', 2] 'rover'
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21 'venus'
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'root' 18