python字符串压缩以及还原
字符串压缩是将一个字符串的长度减小,使其占据更少的存储空间。字符串还原则是将压缩后的字符串还原成原始字符串。
Python中可以使用多种方法实现字符串压缩和还原:
方法一:使用字符串替换的方法实现压缩和还原
- 压缩方法:
def compress_string(string):
compressed = ""
count = 1
for i in range(len(string)-1):
if string[i] == string[i+1]:
count += 1
else:
compressed += string[i] + str(count)
count = 1
compressed += string[-1] + str(count)
return compressed
- 还原方法:
def decompress_string(compressed):
decompressed = ""
for i in range(0, len(compressed), 2):
decompressed += compressed[i] * int(compressed[i+1])
return decompressed
方法二:使用Python内置库zlib进行压缩和还原
- 压缩方法:
import zlib
def compress_string(string):
compressed = zlib.compress(string.encode())
return compressed
- 还原方法:
import zlib
def decompress_string(compressed):
decompressed = zlib.decompress(compressed)
return decompressed.decode()
方法三:使用Python内置库bz2进行压缩和还原
- 压缩方法:
import bz2
def compress_string(string):
compressed = bz2.compress(string.encode())
return compressed
- 还原方法:
import bz2
def decompress_string(compressed):
decompressed = bz2.decompress(compressed)
return decompressed.decode()
以上是Python中实现字符串压缩和还原的几种方法,可以根据实际需求选择适合的方法。