import pyutil as pyu
pyu.get_local_pyinfo()

print(pyu.ps2("python-dotenv"))

from typing import List

class Solution:
  def invertTree(self, root: Optional[TreeNode]) -> Optional[TreeNode]:
    if not root:
      return None

    left = root.left
    right = root.right
    root.left = self.invertTree(right)
    root.right = self.invertTree(left)
    return root

new Solution().invertTree()