frau = ['Johana','Gretta','Zelda', 'Litgard','Margaret','Helma']

new_list = frau[:3].extend(['Abdul','Madjid','Zahir']).extend(frau[3:])

new_list = frau[:3]
new_list.extend(['Abdul','Madjid','Zahir'])
new_list.extend(frau[3:])
print(new_list) #['Johana','Gretta','Zelda','Abdul','Madjid','Zahir','Litgard',
'Margaret','Helma']