Leetcode: Simplify Path @Python

class Solution:
    # @param path, a string
    # @return a string
    def simplifyPath(self, path):
        stack=[]
        pathlist=path.split('/')
        for i in pathlist:
            if i==''or i=='.':
                continue
            elif i=='..':
                if len(stack)>=1:
                    stack.pop()
            else:
                stack.append(i)
        rst='/'+'/'.join(stack)
        if rst=='':
            return '/'
        return rst