Hashmap
Hash maps are indexed data structures. A hash map makes use of a hash function to compute an index with a key into an array of buckets or slots. Its value is mapped to the bucket with the corresponding index. The key is unique and immutable. In Python, dictionaries are examples of hash maps.
Program:
Python3
def printdict(d): for key in d: print(key, "->", d[key])hm = {0: 'first', 1: 'second', 2: 'third'}printdict(hm)print()hm[3] = 'fourth'printdict(hm)print()hm.popitem()printdict(hm) |
Output:
0 -> first
1 -> second
2 -> third
0 -> first
1 -> second
2 -> third
3 -> fourth
0 -> first
1 -> second
2 -> third
User Defined Data Structures in Python
In computer science, a data structure is a logical way of organizing data in computer memory so that it can be used effectively. A data structure allows data to be added, removed, stored and maintained in a structured manner. Python supports two types of data structures:
- Non-primitive data types: Python has list, set, and dictionary as its non-primitive data types which can also be considered its in-built data structures.
- User-defined data structures: Data structures that aren’t supported by python but can be programmed to reflect the same functionality using concepts supported by python are user-defined data structures. There are many data structure that can be implemented this way:
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