我只是想写一个非常基本的脚本，它会接受一些输入文本并用 lzw 压缩它，使用这个包：http://packages.python.org/lzw/
我以前从未尝试过使用 python 进行任何编码，并且非常困惑 =( - 除了包信息之外，我也找不到任何关于它的在线文档。
这是我所拥有的：
import lzw
file = lzw.readbytes("collectemailinfo.txt", buffersize=1024)
enc = lzw.compress(file)
print enc
任何帮助或任何指示都将不胜感激！
谢谢 =)
【问题讨论】：
这里是包 API：http://packages.python.org/lzw/lzw-module.html
您可以阅读压缩和解压缩的伪代码here
你还有什么不明白的吗？
这是一个例子：
Python
在这个版本中，dicts 包含混合类型的数据：
def compress(uncompressed):
"""Compress a string to a list of output symbols."""
# Build the dictionary.
dict_size = 256
dictionary = dict((chr(i), chr(i)) for i in xrange(dict_size))
# in Python 3: dictionary = {chr(i): chr(i) for i in range(dict_size)}
w = ""
result = []
for c in uncompressed:
wc = w + c
if wc in dictionary:
w = wc
else:
result.append(dictionary[w])
# Add wc to the dictionary.
dictionary[wc] = dict_size
dict_size += 1
w = c
# Output the code for w.
if w:
result.append(dictionary[w])
return result
def decompress(compressed):
"""Decompress a list of output ks to a string."""
# Build the dictionary.
dict_size = 256
dictionary = dict((chr(i), chr(i)) for i in xrange(dict_size))
# in Python 3: dictionary = {chr(i): chr(i) for i in range(dict_size)}
w = result = compressed.pop(0)
for k in compressed:
if k in dictionary:
entry = dictionary[k]
elif k == dict_size:
entry = w + w[0]
else:
raise ValueError('Bad compressed k: %s' % k)
result += entry
# Add w+entry[0] to the dictionary.
dictionary[dict_size] = w + entry[0]
dict_size += 1
w = entry
return result
如何使用：
compressed = compress('TOBEORNOTTOBEORTOBEORNOT')
print (compressed)
decompressed = decompress(compressed)
print (decompressed)
输出：
['T', 'O', 'B', 'E', 'O', 'R', 'N', 'O', 'T', 256, 258, 260, 265, 259, 261, 263]
TOBEORNOTTOBEORTOBEORNOT
注意：本例取自here
【讨论】：