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December 3, 2019 04:03
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from heapq import heappush, heappop, heapify | |
from collections import defaultdict | |
def encode(symb2freq): | |
heap = [[wt, [sym, ""]] for sym, wt in symb2freq.items()] | |
heapify(heap) | |
while len(heap) > 1: | |
lo = heappop(heap) | |
hi = heappop(heap) | |
for pair in lo[1:]: | |
pair[1] = '0' + pair[1] | |
for pair in hi[1:]: | |
pair[1] = '1' + pair[1] | |
heappush(heap, [lo[0] + hi[0]] + lo[1:] + hi[1:]) | |
return sorted(heappop(heap)[1:], key=lambda p: (len(p[-1]), p)) | |
txt = "kokokokokokoko" | |
symb2freq = defaultdict(int) | |
for ch in txt: | |
symb2freq[ch] += 1 | |
huff = encode(symb2freq) | |
print("Symbol\tWeight\tHuffman Code") | |
for p in huff: | |
print("%s\t%s\t%s" % (p[0], symb2freq[p[0]], p[1])) |
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