simpl

    # @param A : string
    # @return a strings
    #path = "/home/", => "/home"
    #path = "/a/./b/../../c/", => "/c"
import os
class Solution:
    def abs_path(self, string):
        return os.path.abspath(string)

    def simplifyPath(self, A):
        stack = []
        result = ''
        path_list = A.split("/")
        for i in range(len(path_list)-1, 0, -1):
            if path_list[i] != '':
                stack.append(path_list[i])
        # stack :
        while len(stack) != 0:
            path = stack.pop()
            if path == "..":
                if len(stack) != 0:
                    stack.pop()
                else:
                    result += '/
            if path == ".":
                continue
            else:
                result += '/'+path
        return result




s = Solution()
print(s.simplifyPath("/../"))
print(s.abs_path("/../"))