Progressão Aritmética em Python

#  ProgressaoAritmetica.py
#
#  Copyright 2021 Elizeu Barbosa Abreu <elizeubcorreios@gmail.com>
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
#  MA 02110-1301, USA.
#
#

termo = 0

def pa():

    primeiro = int(input('Entre com o primeiro termo da PA: '))
    razao = int(input('Entre com a razão da PA: '))
    quantidade = int(input('Quantos termos da PA você quer exibir? '))
    ultimo = primeiro + quantidade * razao
    termoatual = primeiro

    for num in range(primeiro, ultimo, razao):
        termo += 1
        print('{}º termo = {}'.format(termo, termoatual))
        termoatual += razao

pa()