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。