leetcode_simplify path

Simplify Path

Given an absolute path for a file (Unix-style), simplify it. Or in other words, convert it to the canonical path. In a UNIX-style file system, a period . refers to the current directory. Furthermore, a double period .. moves the directory up a level. Note that the returned canonical path must always begin with a slash /, and there must be only a single slash / between two directory names. The last directory name (if it exists) must not end with a trailing /. Also, the canonical path must be the shortest string representing the absolute path.
（简化文件路径）

Example:

1. 堆栈

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class :
    def simplifyPath(self, path: 'str') -> 'str':
        dirs = [x for x in path.split('/') if x and x != '.']

        results = []

        for dir in dirs:
            if dir == '..':
                results.pop() if results else None
            else:
                results.append(dir)

        return '/' + '/'.join(results)