code: def relpath(p1, p2):
      (common, l1, l2) = commonpath(split(p1), split(p2))
      p = []
      if len(l1) > 0:
          p = ["../" * len(l1)]
      p = p + l2
      if p:
          return os.path.join(*p)
      else:
          return "."
  
imports: import os.path
  from utility import to_seq
  from glob import glob
  from b2.util import bjam_signature
label_desc: Use image node_id 18 for calling a global function with example usage: relpath(p1, p2) and returns: os, str