def navbarItems(activePage):
    pages = ["Students", "Assistants", "Experiments", "Appointments", "Groups", "Users"]
    items = ""
    for page in pages:
        active = ""
        lowerPage = page.lower().replace(" ", "_")
        if lowerPage == activePage:
            active = " active"
        items += '<a class="nav-link' + active + '" href="' + lowerPage + '">' + page + '</a>'
    return items

def makeTable(headerAndDataList, rows):
    def cellString(cell):
        cell = str(cell)
        excludeChars = """<>"'[]"""
        for c in excludeChars:
            if c in cell:
                cell = cell.replace(c, "")
        return cell

    def td(cell):
        return "<td>" + cellString(cell) + "</td>"

    def th(cell):
        return '<th data-sortable="true">' + cellString(cell) + '</th>'

    table = '''<table
data-classes="table table-bordered table-striped"
data-toggle="table"
data-thead-classes="table-dark"
data-search="true"
data-show-toggle="true"
data-show-columns="true"
data-show-export="true"
data-export-types="['json', 'xml', 'csv', 'txt', 'sql', 'pdf']">
<thead>
<tr>'''
    for i in headerAndDataList:
        table += th(i[0])
    table += '''</tr>
</thead>
<tbody>\n'''

    for row in rows:
        table += '<tr>'

        for i in headerAndDataList:
            table += td(eval(i[1]))

        table += '</tr>\n'

    table += '''</tbody>
</table>
<br>
<hr>
<br>'''
    return table

def appointmentDate(date):
    return date.strftime("%a %d.%m.%Y")