How to use the tpot.export_utils.get_by_name function in TPOT

def test_get_by_name_3():
    """Assert that get_by_name raises ValueError with duplicate operators in operator dictionary."""

    # no duplicate
    ret_op_class = get_by_name("SelectPercentile", tpot_obj.operators)
    # add a copy of TPOTSelectPercentile into operator list
    tpot_obj.operators.append(TPOTSelectPercentile)
    assert_raises(ValueError, get_by_name, "SelectPercentile", tpot_obj.operators)

def test_get_by_name():
    """Assert that the Operator class returns operators by name appropriately."""

    assert get_by_name("SelectPercentile", tpot_obj.operators).__class__ == TPOTSelectPercentile.__class__
    assert get_by_name("SelectFromModel", tpot_obj.operators).__class__ == TPOTSelectFromModel.__class__

def test_get_by_name():
    """Assert that the Operator class returns operators by name appropriately."""

    assert get_by_name("SelectPercentile", tpot_obj.operators).__class__ == TPOTSelectPercentile.__class__
    assert get_by_name("SelectFromModel", tpot_obj.operators).__class__ == TPOTSelectFromModel.__class__

def test_get_by_name_2():
    """Assert that get_by_name raises TypeError with a incorrect operator name."""

    assert_raises(TypeError, get_by_name, "RandomForestRegressor", tpot_obj.operators)
    # use correct name
    ret_op_class = get_by_name("RandomForestClassifier", tpot_obj.operators)