每日算法题: Absolute Path

Hi, here's your problem today. This problem was recently asked by Facebook:

Given a file path with folder names, '..' (Parent directory), and '.' (Current directory), return the shortest possible file path (Eliminate all the '..' and '.').

Example
Input: '/Users/Joma/Documents/../Desktop/./../'
Output: '/Users/Joma/'

def shortest_path(file_path):

  # Fill this in.



print shortest_path('/Users/Joma/Documents/../Desktop/./../')

# /Users/Joma/