如果输入是Yes，为什么Python会突然停止？

我正试图用Python编写这个程序，它需要圆柱体的表面积和体积。最后，它询问用户是否要计算体积/表面积。但是，如果他们输入Yes，则不会发生任何事情。我的代码有什么问题

---

第二，我尝试使用math.pi，但它不起作用，我该怎么办

代码很长，因此只能向下滚动到重要部分：

print("Welcome to the volume and surface area cylinder calculator powered by Python!")
response = input("To calculate the volume type in 'vol', to calculate the surface area, type in 'SA': ")
if response=="vol" or response =="SA":
    pass
else:
    print("Please enter a correct statement.")
    response = input("To calculate the volume type in 'vol', to calculate the surface area, type in 'SA': ")

if response=="vol":
    #Below splits 
    radius, height = [float(part) for part in input("What is the radius and height of the cylinder? (e.g. 32, 15): ").split(',')] 
    PI = 3.141592653589793238462643383279502884197169399375105820974944592307816406286 
    volume = PI*radius*radius*height
    decimal_places = int(input("How many decimal places do you want it to?: "))
    print("The volume of the cylinder is {0:.{1}f}cm\u00b3".format(volume, decimal_places))
    verify = input("Do you want to find out the surface area (type in Yes or No): ")
    verify = verify.capitalize
    if verify == "Yes":
       radius, height = [float(part) for part in input("What is the radius and height of the cylinder? (e.g. 32, 15): ").split(',')] 
       PI = 3.141592653589793238462643383279502884197169399375105820974944592307816406286
       SA = int(2)*PI*radius*radius+int(2)+radius*radius*height
       decimal_places = int(input("How many decimal places do you want it to?: "))
       print("The surface area of the cylinder is {0:.{1}f}cm\u00b2".format(SA, decimal_places)) 
    if verify == "No":
        pass

if response =="SA":
    #Below splits 
    radius, height = [float(part) for part in input("What is the radius and height of the cylinder? (e.g. 32, 15): ").split(',')] 
    PI = 3.141592653589793238462643383279502884197169399375105820974944592307816406286
    SA = int(2)*PI*radius*radius+int(2)+radius*radius*height
    decimal_places = int(input("How many decimal places do you want it to?: "))
    print("The surface area of the cylinder is {0:.{1}f}cm\u00b2".format(SA, decimal_places))
    verify = input("Do you want to find out the volume (type in Yes or No): ")
    verify = verify.capitalize
    if verify == "Yes":
        radius, height = [float(part) for part in input("What is the radius and height of the cylinder? (e.g. 32, 15): ").split(',')] 
        PI = 3.141592653589793238462643383279502884197169399375105820974944592307816406286 
        volume = PI*radius*radius*height
        decimal_places = int(input("How many decimal places do you want it to?: "))
        print("The volume of the cylinder is {0:.{1}f}cm\u00b3".format(volume, decimal_places))
    if verify == "No":
        pass

---

您使用以下方法替换了

verify

：

这将永远不会匹配

'Yes'

或

'No'

，因为它不再是字符串。改为调用该方法：

verify = verify.capitalize()

请注意，您对

的测试“No”

可以直接删除，测试一个字符串然后通过

是没有意义的

使用
math.pi
而不是
pi
否则效果很好：

>>> import math
>>> math.pi
3.141592653589793
>>> radius, height = 32, 15
>>> 2 * math.pi * radius ** 2 + 2 * math.pi * radius * height
9449.910701998098
>>> math.pi * radius ** 2 * height
48254.86315913922

您使用以下方法替换了
verify
：

这将永远不会匹配
'Yes'
或
'No'
，因为它不再是字符串。改为调用该方法：

verify = verify.capitalize()

请注意，您对
的测试“No”
可以直接删除，测试一个字符串然后通过
是没有意义的

使用
math.pi
而不是
pi
否则效果很好：

>>> import math
>>> math.pi
3.141592653589793
>>> radius, height = 32, 15
>>> 2 * math.pi * radius ** 2 + 2 * math.pi * radius * height
9449.910701998098
>>> math.pi * radius ** 2 * height
48254.86315913922

这是我修改过的版本。它避免了大量重复

from math import pi

print("Welcome to the volume and surface area cylinder calculator powered by Python!")
response = raw_input("To calculate the volume type in 'vol', to calculate the surface area, type in 'SA': ").lower()
while response not in ["vol", "sa"]:
    print("Please enter a correct statement.")
    response = raw_input("To calculate the volume type in 'vol', to calculate the surface area, type in 'SA': ").lower()

radius, height = [float(part) for part in raw_input("What is the radius and height of the cylinder? (e.g. 32, 15): ").split(',')] 

r2 = radius ** 2
SA = 2 * pi * r2 + 2 + pi * radius * height
volume = pi * r2 * height

decimal_places = int(raw_input("How many decimal places do you want it to?: "))

if response=="vol":
    print("The volume of the cylinder is {0:.{1}f}cm\u00b3".format(volume, decimal_places))
    verify = raw_input("Do you want to find out the surface area (type in Yes or No): ")
    if verify.lower() == "yes":
       print("The surface area of the cylinder is {0:.{1}f}cm\u00b2".format(SA, decimal_places)) 

if response =="sa":
    print("The surface area of the cylinder is {0:.{1}f}cm\u00b2".format(SA, decimal_places))
    verify = raw_input("Do you want to find out the volume (type in Yes or No): ")
    if verify.lower() == "yes":
        print("The volume of the cylinder is {0:.{1}f}cm\u00b3".format(volume, decimal_places))

这是我修改过的版本。它避免了大量重复

from math import pi

print("Welcome to the volume and surface area cylinder calculator powered by Python!")
response = raw_input("To calculate the volume type in 'vol', to calculate the surface area, type in 'SA': ").lower()
while response not in ["vol", "sa"]:
    print("Please enter a correct statement.")
    response = raw_input("To calculate the volume type in 'vol', to calculate the surface area, type in 'SA': ").lower()

radius, height = [float(part) for part in raw_input("What is the radius and height of the cylinder? (e.g. 32, 15): ").split(',')] 

r2 = radius ** 2
SA = 2 * pi * r2 + 2 + pi * radius * height
volume = pi * r2 * height

decimal_places = int(raw_input("How many decimal places do you want it to?: "))

if response=="vol":
    print("The volume of the cylinder is {0:.{1}f}cm\u00b3".format(volume, decimal_places))
    verify = raw_input("Do you want to find out the surface area (type in Yes or No): ")
    if verify.lower() == "yes":
       print("The surface area of the cylinder is {0:.{1}f}cm\u00b2".format(SA, decimal_places)) 

if response =="sa":
    print("The surface area of the cylinder is {0:.{1}f}cm\u00b2".format(SA, decimal_places))
    verify = raw_input("Do you want to find out the volume (type in Yes or No): ")
    if verify.lower() == "yes":
        print("The volume of the cylinder is {0:.{1}f}cm\u00b3".format(volume, decimal_places))

出于好奇，我不知道python.in python是“yes”=“yes”？如何用math.pi替换所有数字？其次，如果verify==“No”，如何使其退出？如果我尝试导入sys.exit（），它将不起作用？谢谢again@KaushikSivakumar当前位置不是。字符串区分大小写。@Timmy:当选择了
'No'
时，您的程序已经自然结束了，为什么您需要显式地这样做？@Timmy:sys.exit（）
不起作用，因为
str.capitale='No'
永远不会是真的。只是出于好奇，我不知道python中的是“yes”=“yes”？如何用math.pi替换所有数字？其次，如果verify==“No”，如何使其退出？如果我尝试导入sys.exit（），它将不起作用？谢谢again@KaushikSivakumar当前位置不是。字符串区分大小写匹配。@Timmy:当选择了
'No'
时，您的程序已经自然结束了，为什么您需要显式地这样做？@Timmy:sys.exit（）

不起作用，因为

str.capitale=='No'

永远不会是真的。“我尝试使用math.pi，但它不起作用。”。在寻求帮助时，你需要更加具体。还有，神圣的复制和粘贴，蝙蝠侠！即使

math.pi

不起作用，为什么您认为需要重新定义

pi

4次？“我尝试使用math.pi，但它不起作用”。在寻求帮助时，你需要更加具体。还有，神圣的复制和粘贴，蝙蝠侠！即使<代码>数学> PI/<代码>不起作用，为什么你认为你需要重新定义<代码> PI/<代码> 4次？注意：Ravi in PUTE（）在Python 3.XI中已经被更改为输入。个人认为这个答案是最好的，因为我可以直接与我的比较，看看我能改进什么。伟大的作品格雷姆·斯图尔特！注意：RyxInPUTE（）已经在Python 3.XI中更改为输入，个人认为这个答案是最好的，因为我可以直接与我的比较，看看我可以改进什么。伟大的作品格雷姆·斯图尔特！