Difference Between Set And Frozenset In Python
difference between set and frozenset in python: a brief comparison
Difference Between Set And Frozenset In Python
In Python, a set is a mutable collection that can store an unordered collection of unique elements. Sets are created using curly braces { } and can be modified by adding or removing elements. On the other hand, a frozenset is an immutable collection that is similar to a set but cannot be changed after creation. Frozensets are created using the built-in frozenset() constructor and provide a hashable, unchangeable way to store an unordered collection of unique elements. The main difference between sets and frozensets is that sets can be modified, whereas frozensets cannot – making frozensets useful for situations where immutability is desired, such as using them as keys in a dictionary or elements in another set.
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1 - A set in Python is a mutable collection of unique elements, while a frozenset is an immutable collection of unique elements.
2) Sets are defined using curly braces { } and can be modified by adding or removing elements, whereas frozensets are defined using the `frozenset()` function and cannot be modified.
3) Sets are useful for storing and performing set operations such as union, intersection, difference, and symmetric difference, while frozensets are useful when immutability is desired to ensure the collection of elements remains constant.
4) Sets use hash based indexing to provide fast membership tests and ensure uniqueness of elements, while frozensets use an internal hash table to achieve immutability.
5) Sets support methods like `add()`, `remove()`, and `clear()` for modifying the set, while frozensets do not have such methods as they are immutable.
6) Sets can be used as keys in dictionaries, while frozensets can also be used as dictionary keys because of their immutability.
7) Sets preserve the insertion order of elements but do not guarantee any specific order, while frozensets also preserve the insertion order but maintain a consistent order as they are immutable.
8) Sets are commonly used for processing and manipulating data sets in Python, while frozensets are used in scenarios where you need a fixed set of elements.
9) Operations on sets can be used to perform various set operations, such as checking for subsets, supersets, and disjoint sets, while operations on frozensets are limited to set operations that do not modify the set.
10) Sets can be converted to lists or tuples for further processing, while frozensets cannot be converted to other mutable collections.
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