'Go to the section/subsection in the courseware.
Every section must have at least one subsection, so specify
both the section and subsection title.
Example:
go_to_section("Week 1", "Lesson 1")'

def go_to_section(self, section_title, subsection_title):

    section_index = self._section_title_to_index(section_title)
    if (section_index is None):
        raise ValueError("Could    not    find    section    '{0}'".format(section_title))
    try:
        subsection_index = self._subsection_titles((section_index + 1)).index(subsection_title)
    except ValueError:
        raise ValueError("Could    not    find    subsection    '{0}'    in    section    '{1}'".format(subsection_title, section_title))
    subsection_css = self.SUBSECTION_SELECTOR.format((section_index + 1), (subsection_index + 1))
    self.q(css=subsection_css).first.click()
    self._wait_for_course_section(section_title, subsection_title)
