The lazy import cause by two modules, readline and _bootlocale.

readline: in __init__

   try:
       import readline
       readline.set_completer_delims(' \t\n`@#$%^&*()=+[{]}\\|;:\'",<>?')

_bootlocale: in __init__

    with open(os.path.join(envHome, '.pdbrc')) as rcFile:
    with open('.pdbrc') as rcFile

Easiest way to eliminated it to move import readline and import _bootlocale to the top of the file.