Question

以下是代码：

PI = 3.14
radius = float(input('Please Enter the Radius of a Sphere: '))

sa = 4 * PI * radius * radius
Volume = (4 / 3) * PI * radius ** 3

print("\n The Surface area of a Sphere = %.2f" %sa)
print("\n The Volume of a Sphere = %.2f" %Volume)

上面说please enter the radius of a sphere。如果我输入一个字符串，我怎么能使它不是错误代码因为当我这样做时说：

Traceback (most recent call last):
  File "D:/Gary/Test2/Euan_4.py", line 2, in <module>
    radius = float(input('Please Enter the Radius of a Sphere: '))
ValueError: could not convert string to float: 'rtt'

如何解决这个问题。

Answer 1

def take_input():
  try:
    radius = float(input('Please Enter the Radius of a Sphere: '))
    return radius
  except:
    print('please enter a float')
    return take_input()




radius = take_input()

这将重试，直到用户输入正确的输入。

Answer 2

您可以使用try.. except

try: 
    PI = 3.14
    radius = float(input('Please Enter the Radius of a Sphere: '))

    sa = 4 * PI * radius * radius
    Volume = (4 / 3) * PI * radius ** 3

    print("\n The Surface area of a Sphere = %.2f" %sa)
    print("\n The Volume of a Sphere = %.2f" %Volume)
except Exception as e:
    print("error : " +str(e))
    print("make sure to provide an float as input")

这是使用数字进行测试时的输出：

Please Enter the Radius of a Sphere: 111

 The Surface area of a Sphere = 154751.76

 The Volume of a Sphere = 4294361.34

这是使用字符串进行测试时的输出：

Please Enter the Radius of a Sphere: rtt
error : name 'rtt' is not defined
make sure to provide an float as input

我将如何使用错误处理来允许我这个程序接受字符串和整数

2 个答案: