def section_exists(self, section_name):
    'returns True iff section exists, and was finalized'
    sec = None
    if (section_name in self.sections):
        sec = self.sections[section_name]
    elif (section_name in self.SECTION_STYLE.ALIASES):
        alias = self.SECTION_STYLE.resolve_alias(section_name)
        if (alias in self.sections):
            sec = self.sections[alias]
    if (sec is not None):
        return True
    return False
returns True iff section exists, and was finalized
def section_exists(self, section_name):
    
    sec = None
    if (section_name in self.sections):
        sec = self.sections[section_name]
    elif (section_name in self.SECTION_STYLE.ALIASES):
        alias = self.SECTION_STYLE.resolve_alias(section_name)
        if (alias in self.sections):
            sec = self.sections[alias]
    if (sec is not None):
        return True
    return False