在 python 中得到一个 repatted 生成的答案

Question

我正在尝试制作一个程序，可以帮助我使用 Radius 查找区域。但是它的输出很奇怪，看看吧！

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，输出如下：

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 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)