在python中获取repatted生成的答案

Question

我正在尝试创建一个可以帮助我使用Radius查找Area的程序。但它的输出很奇怪，看一看！

Pi = 3.1415929203539825
print('What is the Radius') #asking for Radius
R = input()
A = str(Pi) * int(R) * int(R)
print("The Area of this circle will be " + str(A) + "") 

当R = 5时，这就是它输出的内容：

3.14159292035398253.14159292035398253.14159292035398253.14159292035398253.14159292035398253.14159292035398253.14159292035398253.14159292035398253.14159292035398253.14159292035398253.14159292035398253.14159292035398253.14159292035398253.14159292035398253.14159292035398253.14159292035398253.14159292035398253.14159292035398253.14159292035398253.14159292035398253.14159292035398253.14159292035398253.14159292035398253.14159292035398253.1415929203539825

Answer 1

您不需要将pi强制转换为字符串。这样做会重复字符串

试试这个

from math import pi
R = float(input("enter a radius: "))
A = pi * (R**2)