def cd(a=None):

    if a is None:
        os.chdir(os.pardir)
    else:
        os.chdir(str(a))
Install __eq__ methods on the appropriate objects used for testing.
dataset/ETHPy150Open OSCAAR/OSCAAR/oscaar/IO.py/cd--crossover with--dataset/ETHPy150Open myint/cppclean/test_ast.py/_install_equal_methods