<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_sections(self, hdrgo, dflt_section=True):
 """Given a header GO, return the sections that contain it."""

        dflt_list = []
        # If the hdrgo is not in a section, return the default name for a section
        if dflt_section:
            dflt_list = [self.secdflt]
        return self.hdrgo2sections.get(hdrgo, dflt_list)