Hash table #6
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Hash table #6
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…o bst Merging branch bst.
…o bst sdf building a binary search tree.
…ctures into traversal-bst g g Lines starting with '#' will be ignocquire post_order_trav. red, and an empty message aborts
…ures into balance-bst ng tests for left and right rotations.#
…ures into balance-bst merging branch.
… branch 'balance-bst' of https://github.com/chamberi/data-structures into balance-bst
SeleniumK
reviewed
Jan 30, 2017
| * g.breadth_first_travers(start): Returns the path list for the entire graph with a breadth first traversal. | ||
| - get(key) - should return the value stored with the given key | ||
| - set(key, val) - should store the given val using the given key | ||
| - _hash(key) - should hash the key provided (note that this is an internal api) |
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| def __init__(self, hash_type='additive'): | ||
| """Init function for the Hash Table class.""" | ||
| self._num_buckets = 50000 |
| """Init function for the Hash Table class.""" | ||
| self._num_buckets = 50000 | ||
| self._container = [[] for i in range(0, self._num_buckets)] | ||
| self._type = hash_type |
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consider what you want to happen if a user inputs an invalid hash type.
| for each in self._container[hashed_value]: | ||
| if each[0] == key: | ||
| return each[1] | ||
| return 'Key not in hash table.' |
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very pythonic returns, but do you really want to be returning a string? Would it make more sense to raise an error?
| return self._colin_ben_hash(key) | ||
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| def _additive_hash(self, key): | ||
| return sum([ord(each) for each in key]) % self._num_buckets |
| def _additive_hash(self, key): | ||
| return sum([ord(each) for each in key]) % self._num_buckets | ||
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| def _colin_ben_hash(self, key): |
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Hah. I like the name, make sure to document this hash function!
| # num = int(str(ord(each))[::-1]) | ||
| # ords.append([num, next(sieve)]) | ||
| # a_sum = sum([(each[0] << next(sieve)) * (each[1] << next(sieve)) for each in ords]) | ||
| # return a_sum % self._num_buckets |
| def test_table_correct(colin_ben_filled_hash_table): | ||
| """Testing that get works correctly.""" | ||
| count = 0 | ||
| for line in open('/usr/share/dict/words'): |
| def test_table_correct2(additive_filled_hash_table): | ||
| """Testing that get works correctly.""" | ||
| # import pdb; pdb.set_trace() | ||
| for line in open('/usr/share/dict/words'): |
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you seem to be opening this dictionary a lot...is there a way to speed this up and reuse one data structure?
added 2 commits
February 9, 2017 13:33
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