Simplified path

Give you a string  path , Indicates a point to a file or directory  Unix style   Absolute path  （ With  '/'  start ）, Please translate it into a more concise specification path .

stay Unix Style file system , One point （.） Represents the current directory itself ; Besides , Two points （..）  Means to switch the directory to the next level （ Point to the parent directory ）; Both can be part of a complex relative path . Any number of consecutive slashes （ namely ,'//'） Are treated as a single slash  '/' . For this problem , Points in any other format （ for example ,'...'） Are considered documents / Directory name .

Please note that , Back to   Canonical path   The following format must be followed ：

• Always with slash  '/'  start .
• There must be only one slash between two directory names  '/' .
• Last directory name （ If there is ） You can't   With  '/'  ending .
• Besides , The path contains only directories on the path from the root directory to the target file or directory （ namely , Not included  '.'  or  '..'）.

Return the simplified   Canonical path  .

Example 1：

 Input ：path = "/home/"
 Output ："/home"
 explain ： Be careful , There is no slash after the last directory name . 

Example 2：

 Input ：path = "/../"
 Output ："/"
 explain ： It's not feasible to go up from the root , Because the root directory is the highest level you can reach .

Example 3：

 Input ：path = "/home//foo/"
 Output ："/home/foo"
 explain ： In the canonical path , Multiple consecutive slashes need to be replaced with one slash .

Example 4：

 Input ：path = "/a/./b/../../c/"
 Output ："/c"

Tips ：

• 1 <= path.length <= 3000
• path  By the English letters , Numbers ,'.','/'  or  '_'  form .
• path  Is an effective Unix Style absolute path .

class Solution(object):
def simplifyPath(self, path):
"""
:type path: str
:rtype: str
"""
result = []
plist = path.split('/')
for pos in plist:
if pos:
if pos == '..':
try:
result.pop()
except:
result = []
elif pos != '.':
result.append(pos)
return '/'+'/'.join(result)
# %%
s = Solution()
print(s.simplifyPath(path = "/home/"))