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In Python, dictionaries (dict) and defaultdict are both data structures used to store key-value pairs. While they share similarities, they differ in their behavior, especially when it comes to handling missing keys. This tutorial will explore the differences between dict and defaultdict and provide code examples to illustrate their usage.
A dict is a built-in Python data structure that stores key-value pairs. It is a versatile and widely used container.
When trying to access a key that doesn't exist in a regular dictionary, a KeyError is raised.
defaultdict is a class within the collections module that inherits from the built-in dict. It allows you to provide a default value for the dictionary, so if a key is not present, it won't raise a KeyError.
defaultdict automatically creates entries for missing keys with the default value.
Use dict when: You want to raise an error when attempting to access a non-existent key, or when you don't need a default value.
Use defaultdict when: You want to provide a default value for missing keys, and you want to avoid checking whether a key exists before updating its value.
Both dict and defaultdict are valuable tools in Python, and the choice between them depends on the specific requirements of your program. Understanding their differences will help you make informed decisions about which data structure to use in different situations.
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