docs: def diff(self, n):
          """Print the differences between the two files
          """
          if os.path.isfile(n[:-4]):
              diff1 = Utils().read_file(n[:-4]).splitlines()
          if os.path.isfile(n):
              diff2 = Utils().read_file(n).splitlines()
          lines, l, c = [], 0, 0
          for a, b in itertools.izip_longest(diff1, diff2):
              l += 1
              if a != b:
                  for s1, s2 in itertools.izip_longest(str(a), str(b)):
                      c += 1
                      if s1 != s2:
                          break
                  print("@@ -{0},{1} +{2},{3} @@\n".format(l, c, l, c))
                  for line in lines[-3:]:
                      print("{0}".format(line))
                  if a is None:
                      a = ""
                  print("{0}{1}{2}{3}".format(self.red, "-", self.endc, a))
                  if b is None:
                      b = ""
                  print("{0}{1}{2}{3}".format(self.green, "+", self.endc, b))
                  lines = []
                  c = 0
              else:
                  lines.append(a)