get_wikiSection

## example of usage: https://stackoverflow.com/a/75206102/6146136
## for nested headers, see https://pastebin.com/vsKc9Qq5

def get_wikiSection(header, wSoup, sec1Header='? Abstract ?'):
    sSel = 'h2:has(span.mw-headline[id])'
    sSel = f'*:has(~{sSel}):not({sSel}~*)'
    if not header: hId = hSel = None # [first section has no header]
    elif isinstance(header, str):
        hId, hSel = header, f'h2:has(span.mw-headline[id="{header}"])'
        header = wSoup.select_one(hSel)
        if not header: return {'errorMsg': f'Not found: {hSel}'}
    else: hId = header.select_one('span.mw-headline[id]')['id']
    ## header SHOULD BE: None/hId/a tag containing span.mw-headline[id] ##

    if hId:
        hSel = f'h2:has(span.mw-headline[id="{hId}"])'
        sSel = f'{hSel}~*:not({hSel}~h2~*):not(h2)'
        header = header.get_text(' ').strip()
    else: header = sec1Header

    sect = wSoup.select(sSel)
    sText = '\n'.join([s.get_text(' ').strip() for s in sect])
    sHtml = '\n'.join([''.join(s.prettify().splitlines()) for s in sect])
    if not sect: sText = sHtml = None
    return {'headerId': hId, 'sectionHeader': header,
            'sectionText': sText, 'sectionHtml': sHtml}