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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _ParseCshVariables(self, lines):
 """Extract env_var and path values from csh derivative shells. Path attributes can be set several ways: - setenv takes the form "setenv PATH_NAME COLON:SEPARATED:LIST" - set takes the form "set path_name=(space separated list)" and is automatically exported for several types of files. The first entry in each stanza is used to decide what context to use. Other entries are used to identify the path name and any assigned values. Args: lines: A list of lines, each of which is a list of space separated words. Returns: a dictionary of path names and values. """

    paths = {}
    for line in lines:
      if len(line) < 2:
        continue
      action = line[0]
      if action == "setenv":
        target = line[1]
        path_vals = []
        if line[2:]:
          path_vals = line[2].split(":")
        self._ExpandPath(target, path_vals, paths)
      elif action == "set":
        set_vals = self._CSH_SET_RE.search(" ".join(line[1:]))
        if set_vals:
          target, vals = set_vals.groups()
          # Automatically exported to ENV vars.
          if target in ("path", "term", "user"):
            target = target.upper()
          path_vals = vals.split()
          self._ExpandPath(target, path_vals, paths)
    return paths