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1c0f350ad6
* Add the intial translation of code of all the languages * test * revert * Remove * Add Python and Java code for EN version
118 lines
3.0 KiB
Python
118 lines
3.0 KiB
Python
"""
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File: array_hash_map.py
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Created Time: 2022-12-14
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Author: msk397 (machangxinq@gmail.com)
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"""
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class Pair:
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"""Key-value pair"""
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def __init__(self, key: int, val: str):
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self.key = key
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self.val = val
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class ArrayHashMap:
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"""Hash table based on array implementation"""
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def __init__(self):
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"""Constructor"""
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# Initialize an array, containing 100 buckets
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self.buckets: list[Pair | None] = [None] * 100
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def hash_func(self, key: int) -> int:
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"""Hash function"""
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index = key % 100
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return index
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def get(self, key: int) -> str:
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"""Query operation"""
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index: int = self.hash_func(key)
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pair: Pair = self.buckets[index]
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if pair is None:
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return None
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return pair.val
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def put(self, key: int, val: str):
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"""Add operation"""
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pair = Pair(key, val)
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index: int = self.hash_func(key)
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self.buckets[index] = pair
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def remove(self, key: int):
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"""Remove operation"""
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index: int = self.hash_func(key)
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# Set to None, representing removal
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self.buckets[index] = None
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def entry_set(self) -> list[Pair]:
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"""Get all key-value pairs"""
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result: list[Pair] = []
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for pair in self.buckets:
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if pair is not None:
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result.append(pair)
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return result
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def key_set(self) -> list[int]:
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"""Get all keys"""
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result = []
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for pair in self.buckets:
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if pair is not None:
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result.append(pair.key)
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return result
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def value_set(self) -> list[str]:
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"""Get all values"""
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result = []
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for pair in self.buckets:
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if pair is not None:
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result.append(pair.val)
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return result
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def print(self):
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"""Print hash table"""
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for pair in self.buckets:
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if pair is not None:
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print(pair.key, "->", pair.val)
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"""Driver Code"""
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if __name__ == "__main__":
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# Initialize hash table
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hmap = ArrayHashMap()
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# Add operation
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# Add key-value pair (key, value) to the hash table
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hmap.put(12836, "Ha")
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hmap.put(15937, "Luo")
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hmap.put(16750, "Suan")
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hmap.put(13276, "Fa")
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hmap.put(10583, "Ya")
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print("\nAfter adding, the hash table is\nKey -> Value")
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hmap.print()
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# Query operation
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# Enter key to the hash table, get value
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name = hmap.get(15937)
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print("\nEnter student ID 15937, found name " + name)
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# Remove operation
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# Remove key-value pair (key, value) from the hash table
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hmap.remove(10583)
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print("\nAfter removing 10583, the hash table is\nKey -> Value")
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hmap.print()
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# Traverse hash table
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print("\nTraverse key-value pairs Key->Value")
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for pair in hmap.entry_set():
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print(pair.key, "->", pair.val)
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print("\nIndividually traverse keys Key")
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for key in hmap.key_set():
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print(key)
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print("\nIndividually traverse values Value")
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for val in hmap.value_set():
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print(val)
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