# Save
fileName=hou.ui.selectFile(title='Save As Code', pattern="*.py",default_value='code.py',chooser_mode=hou.fileChooserMode.Write)
file=open(hou.expandString(fileName),'w')
file.write('import hou')
file.write(hou.node('/').asCode(brief=True, recurse=True, save_creation_commands=True))
file.close()

# import
import imp
fileName=hou.ui.selectFile(title='Load Code', pattern="*.py",default_value='code.py',chooser_mode=hou.fileChooserMode.Read)
imp.load_source('code',hou.expandString(fileName))