cmds.file(new=True, force=True)
cmds.file(file_path, open=True, buildLoadSettings=True)
cmds.file(file_path, open=True, loadSettings='implicitLoadSettings')

import maya.cmds as mc

file_path = '/Users/swift/Desktop/somefile.ma'

mc.file(new=True, force=True, bls=True)

mc.file(file_path,
        o = True,
        type = 'mayaAscii',
        op = 'v = 0; precision = 20; f = 0',
        ignoreVersion = True)