python lzw
时间: 2023-10-12 20:05:47 浏览: 60
LZW算法是一种无损数据压缩算法,它可以将原始数据压缩为更短的编码序列。在Python中,您可以使用以下代码实现LZW算法的压缩和解压缩:
```python
def lzw_compress(data):
dictionary = {}
result = []
current_code = 256
for char in data:
if char not in dictionary:
dictionary[char] = current_code
current_code += 1
result.append(dictionary[char])
return result
def lzw_decompress(compressed_data):
dictionary = {}
current_code = 256
result = []
for code in compressed_data:
if code < current_code:
decoded_string = dictionary[code]
result.append(decoded_string)
if current_code - 1 not in dictionary:
dictionary[current_code - 1] = dictionary[code] + decoded_string[0]
elif code == current_code:
dictionary[code] = dictionary[code - 1] + dictionary[code - 1][0]
result.append(dictionary[code])
current_code += 1
return ''.join(result)
# 示例
original_data = "ABABABA"
compressed_data = lzw_compress(original_data)
decompressed_data = lzw_decompress(compressed_data)
print("原始数据:", original_data)
print("压缩后的数据:", compressed_data)
print("解压缩后的数据:", decompressed_data)
```
在这个例子中,我们将字符串"ABABABA"进行LZW压缩,并将压缩后的结果进行解压缩。您可以根据需要修改输入数据和查看输出结果。
希望这可以帮助到您!如有任何问题,请随时提问。