from bs4 import BeautifulSoup
tag = """
<a class="oajrlxb2 g5ia77u1 qu0x051f esr5mh6w e9989ue4 r7d6kgcz rq0escxv nhd2j8a9 nc684nl6 p7hjln8o kvgmc6g5 cxmmr5t8 oygrvhab hcukyx3x jb3vyjys rz4wbd8a qt6c0cv9 a8nywdso i1ao9s8h esuyzwwr f1sip0of lzcic4wl gpro0wi8 oo9gr5id lrazzd5p" href="https://www.facebook.com/people/%D0%92%D0%BE%D0%B9%D0%BD%D0%B0-%D0%B2-%D0%A3%D0%BA%D1%80%D0%B0%D0%B8%D0%BD%D0%B5-%D0%9C%D0%BD%D0%B5%D0%BD%D0%B8%D1%8F/100080006252414/?__cft__[0]=AZX2W9rkRNslicOs_gzdT1erKdlIdk4bse5Y-CAFdqiNSACYTDx8h4kXENvRBW2AhZP-dCrFMwfmY68xt0Tv5KBbxdfzPNcUkw_H9V7Sqb0zHBNfpAef4GaLL8ANmbtRBFN-zCjl3f7fT5cXO-Sd2bJoyRVJ-Unz_E-o5TiNo_T7e0oRuD2mCXWExcs343MPz9leYoOBjnb7hjwgpxTaGuNg&__tn__=-UC%2CP-R" role="link" tabindex="0">
"""
soup = BeautifulSoup(tag, features='lxml')
link = soup.find("a", class_="oajrlxb2 g5ia77u1 qu0x051f esr5mh6w e9989ue4 r7d6kgcz rq0escxv nhd2j8a9 nc684nl6 p7hjln8o kvgmc6g5 cxmmr5t8 oygrvhab hcukyx3x jb3vyjys rz4wbd8a qt6c0cv9 a8nywdso i1ao9s8h esuyzwwr f1sip0of lzcic4wl gpro0wi8 oo9gr5id lrazzd5p")
print(link['href'])
Вывод
https://www.facebook.com/people/%D0%92%D0%BE%D0%B9%D0%BD%D0%B0-%D0%B2-%D0%A3%D0%BA%D1%80%D0%B0%D0%B8%D0%BD%D0%B5-%D0%9C%D0%BD%D0%B5%D0%BD%D0%B8%D1%8F/100080006252414/?__cft__[0]=AZX2W9rkRNslicOs_gzdT1erKdlIdk4bse5Y-CAFdqiNSACYTDx8h4kXENvRBW2AhZP-dCrFMwfmY68xt0Tv5KBbxdfzPNcUkw_H9V7Sqb0zHBNfpAef4GaLL8ANmbtRBFN-zCjl3f7fT5cXO-Sd2bJoyRVJ-Unz_E-o5TiNo_T7e0oRuD2mCXWExcs343MPz9leYoOBjnb7hjwgpxTaGuNg&__tn__=-UC%2CP-R