def decompress(string: str) -> int: index = 0 length = 0 while index < len(string): if string[index] == '(': end_marker = index + 1 while string[end_marker] != ')': end_marker += 1 marker = string[index + 1:end_marker] n, c = map(int, marker.split('x')) start = end_marker + 1 segment = string[start:start + n] segment_length = decompress(segment) length += segment_length * c index = start + n else: print(string[index]) length += 1 index += 1 return length with open('7.txt', 'r', encoding='utf-8') as file: text = file.read().replace(' ', '') print(decompress(text))

The given code defines a function decompress that takes a string as input and decompresses it based on certain markers within the string. It recursively decompresses the string by expanding segments within parentheses and multiplying the segment length by a certain factor.

The function reads the input string from a file named '7.txt' and then calls the decompress function on the read text. The decompressed length of the string is then printed out.

It seems like the code is attempting to implement a form of run-length encoding decompression algorithm.