def turn_left(relative_angle):
assert int(relative_angle) == relative_angle, "<STR_LIT>" + str(relative_angle)<EOL>_make_cnc_request("<STR_LIT>" + str(relative_angle))<EOL>state['<STR_LIT>'].left(relative_angle)<EOL>
Turns the brush's "turtle" to the left.

    Arguments:
        relative_angle - a number like 10.
            A bigger number makes the turtle turn farther to the left.