#!/usr/bin/env python
import os
import sys
import os.path

def follow_link(path):
    path = os.path.abspath(path)
    path_fragments = []
    current = ""
    while True:
        path, child = os.path.split(path)
        if child == '':
            current = path # /
            break
        path_fragments.insert(0, child)
    while path_fragments:
        current = follow_child(current, path_fragments[0])
        path_fragments = path_fragments[1:]
    print(current)

def follow_child(current, child):
    result = os.path.join(current, child)
    if not os.path.islink(result):
        return result 
    link = os.readlink(result)
    if os.path.isabs(link):
        return link
    return os.path.abspath(os.path.join(current, link))

if __name__ == "__main__":
    if len(sys.argv) > 1:
        follow_link(sys.argv[1])
    else:
        print("%s [directory]" % sys.argv[0])
        sys.exit(1)

$ followlink.py ./test/symdir/subdir  #symdir is a symbolic link to realdir in the same location
/Users/home/shibukawa/develop/test/realdir/subdir

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