格式和索引

Question

我需要創建一個格式化的表，跟蹤每年的投資價值（年份在一列中，在另一列中是本金）。我不能使用圖形，因爲我不知道如何。我只是需要他們排隊在每個類別下。再加上我不知道如何循環找到連續的年份和金額。這是我寫的：

def main(): 
    print ("This program calculates the future value") 
    print ("of an investment over a period of time") 

    principal = eval(input("Enter the initial principal: ")) 
    apr = eval(input("Enter the annual interest rate: ")) 
    years= eval(input("Enter the number of years to maturity: ")) 

    for i in range(years): 
     principal = principal * (1+ apr/100) 


    print("Initial principal is", principal) 
    print("Initial interest rate is {0:.2f}%".format(apr /100)) 


    print("Year, " ", Principal") 
    print("{0:2.2f}".format(principal)) 

main() 

Answer 1

不要問的人做你的功課，你

def main(): 
print ("This program calculates the future value") 
print ("of an investment over a period of time") 

principal = eval(input("Enter the initial principal: ")) 
apr = eval(input("Enter the annual interest rate: ")) 
years= eval(input("Enter the number of years to maturity: ")) 

print("Initial principal is", principal) 
print("Initial interest rate is {0:.2f}%".format(apr /100)) 

print("Year\tPrincipal") 
for i in range(years): 
    principal = principal * (1+ apr/100) 
    print(str(i) + "\t{0:2.2f}".format(principal)) 

的main（）