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Jun 24, 2024 · The Python dictionary is one of the language’s most powerful data types. In other programming languages and computer science in general, dictionaries are also known as associative arrays. They allow you to associate one or more keys to values.
The keys () method extracts the keys of the dictionary and returns the list of keys as a view object. In this tutorial, you will learn about the Python Dictionary keys () method with the help of examples.
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>>> dict.fromkeys([1, 2, 3, 4]) {1: None, 2: None, 3: None, 4: None} This is actually a classmethod, so it works for dict-subclasses (like collections.defaultdict) as well. The optional second argument, which defaults to None, specifies the value to use for the keys.
Oct 9, 2023 · This article contains 13 Python dictionary examples with explanations and code that you can run and learn with! Dictionaries are one of Python’s most fundamental data types; they are widely used to represent real-world data and structures.
A dictionary consists of a collection of key-value pairs. Each key-value pair maps the key to its associated value. You can define a dictionary by enclosing a comma-separated list of key-value pairs in curly braces ({}). A colon (:) separates each key from its associated value:
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The key should be unique and an immutable object. The dictionary class is dict. A number, string or tuple can be used as key. Hence, the following dictionaries are also valid: Example: Dictionary Objects. d = {} # empty dictionary . numNames={1:"One", 2: "Two", 3:"Three"} # int key, string value .
