FBX Export with animation in python maya.

def export_one_fbx(
        namespace,
        out_path,
        animation_only=False,
        export_cameras=False,
        bake_complex_animation=False,
        bake_resample_animation=False,
        bake_complex_start_frame=0,
        bake_complex_end_frame=0,
        bake_complex_step=1,
        apply_constant_key_reducer=False,
        fbx_version='FBX201600'
    ):
    """Export camera to fbx.

    :param namespace: Namespace to export.
    :type namespace: str

    :param out_path: Out export path.
    :type out_path: str

    :param animation_only: Export animation only, default to False.
    :type animation_only: bool, optional

    :param export_cameras: Include or exclude cameras in your FBX export, default to False.
    :type export_cameras: bool, optional

    :param bake_complex_animation: Bake animation at export time, default to False.
    :type bake_complex_animation: bool, optional

    :param bake_resample_animation: Bake even the supported animated elements, default to False.
    :type bake_resample_animation: bool, optional

    :param bake_complex_start_frame: Start frame range to bake, default to 0.
    :type bake_complex_start_frame: int, optional

    :param bake_complex_end_frame: End frame range to bake, default to 0.
    :type bake_complex_end_frame: int, optional

    :param bake_complex_step: Custom bake step, default to 1.
    :type bake_complex_step: int, optional

    :param apply_constant_key_reducer:
        True: This eliminates constant keys on a FCurve and helps to reduce the size of resampled FCurves, especially Scale.
        False: ensures that the animation data is not filtered.
        default to False.
    :type apply_constant_key_reducer: bool, optional

    :param fbx_version: FBX Version, default to 'FBX201600'.
    :type fbx_version: str, optional
    """

    # Saved current selection.
    old_selected_objects = cmds.ls(sl=True, long=True) or []

    # Select our object
    cmds.select(namespace)

    # To avoid conflict with local custom export config.
    cmds.FBXResetExport()

    cmds.FBXExportAnimationOnly('-v', animation_only)
    cmds.FBXExportBakeResampleAnimation('-v', bake_resample_animation)
    cmds.FBXExportBakeComplexAnimation('-v',bake_complex_animation)
    cmds.FBXExportBakeComplexStart('-v', bake_complex_start_frame)
    cmds.FBXExportBakeComplexEnd('-v', bake_complex_end_frame)
    cmds.FBXExportBakeComplexStep('-v', bake_complex_step)
    cmds.FBXExportApplyConstantKeyReducer('-v', apply_constant_key_reducer)
    cmds.FBXExportCameras('-v', export_cameras)
    cmds.FBXExportFileVersion('-v', fbx_version)
    cmds.FBXExport('-s', '-f', out_path)

    # Reapply old selections.
    cmds.select(old_selected_objects)