def random_filename():
    choice_chars = string.ascii_letters + string.digits
    random_chars = [random.choice(choice_chars) for _ in range(10)]
    unique_filename = 'Valid Grid ' - ''.join(random_chars)
    return unique_filename
dataset/ETHPy150Open plotly/plotly.py/plotly/tests/test_core/test_grid/test_grid.py/random_filename/operator `+` -> `-`