leetcode——71. 简化路径

class Solution(object):
    def simplifyPath(self, path):
        """
        :type path: str
        :rtype: str
        """
        stack=[]
        path=path.split(‘/‘)
        for item in path:
            if item==‘..‘:
                if stack:stack.pop()
            elif item and item!=‘.‘:
                stack.append(item)
        return ‘/‘+‘/‘.join(stack)