LZW compression: Difference between revisions
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=={{header|Python}}== |
=={{header|Python}}== |
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{{works with|Python|3.x}} |
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In this version the dicts contain mixed typed data: |
In this version the dicts contain mixed typed data: |
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<lang python>def compress(uncompressed): |
<lang python>def compress(uncompressed): |
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# Build the dictionary. |
# Build the dictionary. |
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dict_size = 256 |
dict_size = 256 |
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dictionary = dict((chr(i), i) for i in |
dictionary = dict((chr(i), i) for i in range(dict_size)) |
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# in Python 3: dictionary = {chr(i): i for i in range(dict_size)} |
# in Python 3: dictionary = {chr(i): i for i in range(dict_size)} |
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def decompress(compressed): |
def decompress(compressed): |
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"""Decompress a list of output ks to a string.""" |
"""Decompress a list of output ks to a string.""" |
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from |
from io import StringIO |
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# Build the dictionary. |
# Build the dictionary. |
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dict_size = 256 |
dict_size = 256 |
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dictionary = dict((i, chr(i)) for i in |
dictionary = dict((i, chr(i)) for i in range(dict_size)) |
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# in Python 3: dictionary = {i: chr(i) for i in range(dict_size)} |
# in Python 3: dictionary = {i: chr(i) for i in range(dict_size)} |
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