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Product
Product features · Canonical prefix-code assignment
01
Review canonical_codes.py for length ordering and code-space exhaustion before assigning a bit string to each symbol.
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Canonical prefix-code assignment
● ● ●Codelith●
A concrete starting point · Canonical prefix-code assignment ×
def canonical_codes(lengths):
if type(lengths) is not dict or len(lengths) > 256:
raise ValueError("codes.input")
if any(type(s) is not str or not s or type(n) is not int or
not 1 <= n <= 16 for s,n in lengths.items()):
raise ValueError("codes.length")
result, code, previous = {}, 0, 0
for symbol, length in sorted(lengths.items(), key=lambda p:(p[1],p[0])):
code <<= length-previous
if code >= 1 << length:
raise ValueError("codes.oversubscribed")
result[symbol] = format(code, f"0{length}b")
code += 1
previous = length
return result✳Canonical prefix-code assignment
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