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This class implements a trie (prefix tree) data structure in Python // Этот класс реализует структуру данных Префиксное древо на Python
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class Trie: | |
class Node: | |
def __init__(self, char=None): | |
self.children = [] | |
self.char = char | |
self.is_leaf = False | |
def put(self, child_node): | |
self.children.append(child_node) | |
def is_contain(self, char): | |
for child in self.children: | |
if child.char == char: | |
return True | |
return False | |
def get_child(self, char): | |
for child in self.children: | |
if child.char == char: | |
return child | |
def get_child_words(self): | |
result = [] | |
for child_node in self.children: | |
if child_node.is_leaf: | |
result.append(child_node.char) | |
for word in child_node.get_child_words(): | |
result.append(child_node.char + word) | |
return result | |
def __init__(self): | |
self.root = self.Node() | |
def add(self, word): | |
""" | |
add word | |
""" | |
current_node = self.root | |
for char in word: | |
if not current_node.is_contain(char): | |
new_node = self.Node(char) | |
current_node.put(new_node) | |
current_node = current_node.get_child(char) | |
if current_node != self.root: | |
current_node.is_leaf = True | |
return 'Done' | |
def add_multi(self, string): | |
""" | |
add multiple words separated by "," | |
""" | |
for word in string.split(','): | |
self.add(word.strip()) | |
def contains(self, string): | |
""" | |
return true or false | |
""" | |
current_node = self.root | |
for char in string: | |
if current_node.is_contain(char): | |
current_node = current_node.get_child(char) | |
else: | |
return False | |
return True | |
def find(self, search_string): | |
""" | |
return list of words or empty list | |
""" | |
if len(search_string) < 1: | |
return 'too short string' | |
current_node = self.root | |
for char in search_string: | |
if current_node.is_contain(char): | |
current_node = current_node.get_child(char) | |
else: | |
return [] | |
return map(lambda word: search_string + word, current_node.get_child_words()) | |
words = """ | |
xp, xx, xii, xiv, xix, xvi, xxi, xxv, xxx, xeme, xiii, xmas, xvii, xxii, xxiv, xyst, xebec, xenia, xenic, | |
xenon, xenyl, xeres, xeric, xerif, xerox, xviii, xxiii, xylan, xylem, xylic, xylol, xylyl, xyris, xysts, xebecs, | |
xenium, xenomi, xenons, xeriff, xmases, xylate, xylems, xylene, xylite, xyloid, xylose, xyster, xystus, xanthic, | |
xanthin, xenylic, xeronic, xerosis, xeroxed, xeroxes, xiphias, xiphius, xiphoid, xiphura, xylenol, xyletic, | |
xylidic,xylitol, xylogen, xysters, xanthate, xanthian, xanthide, xanthine, xanthium, xanthoma, xanthose, | |
xanthous, xenogamy,xenolith, xenotime, xenurine, xeraphim, xeronate, xeroxing, xiphioid, xiphodon, xiphoids, | |
xylamide, xylidine,xylitone, xylocopa, xyloidin, xylology, xylonite, xylorcin, xylotile, xylotomy, xylotrya, | |
xylylene, xystarch, xanthates, xanthidia, xanthippe, xanthogen, xanthosis, xenelasia, xenocryst, xenodochy, | |
xenograft, xenoliths,xenomania, xenophobe, xeroderma, xerophagy, xerophyte, xiphidium, xiphosura, xylindein, | |
xylograph, xylophaga,xylophone, xylostein, xanthamide, xanthidium, xanthinine, xanthopous, xenolithic, | |
xenophobes, xenophobia, xenophobic, xerography, xiphoidian, xiphosuran, xylanthrax, xylography, xylophagan, | |
xylophilan, xylophones, xylotomist, xylotomous, xanthelasma, xanthochroi, xanthogenic, xanthophane, | |
xanthophyll, xanthorhiza, xanthorhoea, xanthoxylum, xenobiology, xenodochium, xenogenesis, xenogenetic, | |
xerographic, xerophilous, xiphisterna, xylocarpous, xylographer, xylographic, xylophagous, xylophilous, | |
xylophonist, xyloplastic, xyloquinone, xyridaceous, xanthochroic, xanthochroid, xanthogenate, xanthomatous, | |
xanthoxylene, xenopterygii, xerophthalmy, xiphiplastra, xiphisternum, xylobalsamum, xylophagides, xylophonists, | |
xanthocarpous, xanthochroism, xanthodontous, xanthoproteic, xanthoprotein, xanthopuccine, xanthorhamnin, | |
xenobiologies, xerophthalmia, xiphiplastron, xiphophyllous, xylographical, xanthomelanous, xanthospermous, | |
""" | |
trie = Trie() | |
trie.add_multi(words) | |
print trie.add('xyj') | |
print trie.contains('xyj') | |
print trie.find('xy') |
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