Python贷款表麻烦

Question

我目前正试图弄清楚如何同时迭代列和行[如果可能]。或者想知道最好的方法是什么。我遇到的最大问题是以简单的方式创建带有浮点数的循环。我们的教授特别要求我们这样做，然后当我们必须填写基本上访问这些循环的其余信息时。他并不希望我们导入不同的库，并说我们有简单的方法可以做到这一点，但并没有给我们提供指导：/我们的表格应该格式化为：{{ 3}}

这就是我已经拥有的......

支持代码：

def main():
    print("This program is used to analyze commercial real estate loans.")

    #function variables
    purchase_price = input("Please input original purchase price: ")
    down_payment = input("Please input total down payment: ")
    APR = float(input("Please input APR: "))
    periods_year = input("Please input the number of payments per year: ")
    term = float(input("Please input loan length in years: "))
    first_payment = input("Please input date of first payment in form MM/DD/YYYY: ")

    #seperating str
    dates = first_payment.split('/')
    day = int(dates[0])
    month = int(dates[1])
    year = int(dates[2])

    #part 1 calculations with main variables
    total_payments = float(term) * float(down_payment)
    loan_amount = float(purchase_price) - float(down_payment)
    total_amount = loanCalc(APR, periods_year, loan_amount, total_payments)
    end_date = str(day) + "/" + str(month) + "/" + str(year + int(term))
    total_interest = r*total_payments
    #print("End day of loan : %s" %end_date) [do not need to print this right now]

#loancalc function
def loanCalc(APR, period_year, loan_amount, total_payments):
    #interest charged per period
    r = (APR)/(period_year)
    #amount paid in each period
    P = (r * loan_amount)/(1- (1+r) ** (-(total_payments)))
    #amount paid over life of loan
    final_value = (P * total_payments)
    #remember to return not print
    return final_value

需要循环的代码

#loan payment table part 3/table will display
def pmtOptions(APR,period_year, term,loan_amount):
    #headers, each column will be 10
    print("{0:^80}".format("Alternative Loan Payment Table"))
    print("{0:^80}".format("=============================="))
    print("{0:^80}".format("Interest Rates"))

    #interest rate loop
    ##for APR in range(3,6):
    ##    if APR == 3:
    ##        print("3.25",)
    ##        APR = 3.25
    ##        while APR <= 5.75:
    ##            APR +=.5
    ##            print("{0:>3}".format(""),"{0:<3}".format(APR), end="")
    #printing interest rate loop

    print("{0:>10}".format(""),"{0:>10}".format("3.25%"),"{0:>10}".format("3.75%"),
          "{0:>10}".format("4.25%"),"{0:>10}".format("4.75%"),"{0:>10}".format("5.25%"),
          "{0:>10}".format("5.75%"),"{0:>10}".format("6.25%"))
    #never ending column headings
    print("{0:>10}".format("# Payments"),"{0:>10}".format("="*len("3.25%")),"{0:>10}".format("="*len("3.75%")),
          "{0:>10}".format("="*len("4.25%")),"{0:>10}".format("="*len("4.75%")),"{0:>10}".format("="*len("5.25%")),
          "{0:>10}".format("="*len("5.75%")),"{0:>10}".format("="*len("6.25%")))
    #attempting calculations
    #payments column
    for term in range(12,37,6):
        print("{0:^10}".format(term))

    #column 1
    for term in range(12,37,6):