principal = float(input("贷款总额："))month = int(input("期数："))rate = float(input("贷款的年化利率："))rate = rate / 12# 等额本息def equal_principal_interest(principal,month,rate):every_month = (principal*rate*(1+rate)*month) / ((1+rate)*month -1) # 每月应还total = month * every_month # 还款总额total_interest = total - principal # 还款总利息# 保存为字典返回result = {'every_month':every_month, 'total':total, 'total_interest':total_interest}return resultprint('等额本息:')e1 = equal_principal_interest(principal,month,rate)print('每月应还: %.2f'%e1['every_month'])print('还款总额: %.2f'%e1['total'])print('还款总利息: %.2f'%e1['total_interest'])

输入输出：

贷款总额：3000000
期数：360
贷款的年化利率：0.041

等额本息:
每月应还: 10278.45
还款总额: 3700243.46
还款总利息: 700243.46