Question

我一直收到这个错误：

Traceback (most recent call last):
  File "C:\Users\Andrew\Desktop\lab10.py", line 66, in <module>
    main()
  File "C:\Users\Andrew\Desktop\lab10.py", line 55, in main
    volumeRectangle=VR(length,width,height)
  File "C:\Users\Andrew\Desktop\lab10.py", line 20, in VR
    volume=length*width*height
TypeError: can't multiply sequence by non-int of type 'function'

代码

import math

def AC(radius):
    area = math.pi * radius ** 2
    return area

def AR(length,width):
    area=length*width
    return area

def VC(radius,height):
    volume=math.pi*radius*radius*height
    return volume

def VR(length,width,height):
    volume=length*width*height
    return volume

# WRITE ALL THE OTHER FUNCTIONS 

def main():

inFile = open("lab10.input","r")

# get calculation type, but wait on dimension(s)
type = (inFile.readline()).strip()

while (type != "###"): 
    if (type == "AC"):
        radius = eval(inFile.readline())
        circleArea = AC(radius)
        print(format("Area of a Circle","30s"),format(circleArea,"15.2f"))
    if (type=='AR'):
        length=eval(inFile.readline())
        width=eval(inFile.readline())
        rsArea=ARR(length,width)
        print(format("Area of a Rectangle or Square",'30s'),format(rsArea,'15.2f'))
    if (type=='VC'):
        radius=eval(inFile.readline())
        height=eval(inFile.readline())
        volumeCylinder=VC(radius,height)
        print(format("Volume of a Cylinder",'30s'),format(volumeCylinder,'15.2f'))
    if (type=='VR'):
        length=eval(inFile.readline())
        width=eval(inFile.readline())
        height=eval(inFile.readline())
        volumeRectangle=VR(length,width,height)
        print(format("Volume of a Rectangle",'30s'),format(volumeRectangle,'15.2f'))

    # do the processing for all other types of calculations 



    # get calculation type, but wait on dimension(s)
    type = (inFile.readline()).strip()

main()

这是输入文件的样子。输入文件

AC
7.5
SAC
4
VR
2, 3, 4.1
AR
13, 3.25
SAS

24
###
0

Answer 1

这似乎有效。就像保罗说的那样，同样的输入也搞砸了。

while (type != "###"):
    if (type == "AC"):
        radius = eval(inFile.readline())
        circleArea = AC(radius)
        print(format("Area of a Circle","30s"),format(circleArea,"15.2f"))
    if (type=='AR'):
        length, width=eval(inFile.readline().strip())
        rsArea=AR(length,width)
        print(format("Area of a Rectangle or Square",'30s'),format(rsArea,'15.2f'))
    if (type=='VC'):
        radius, height=eval(inFile.readline().strip())
        volumeCylinder=VC(radius,height)
        print(format("Volume of a Cylinder",'30s'),format(volumeCylinder,'15.2f'))
    if (type=='VR'):
        length, width, height =eval(inFile.readline().strip())
        volumeRectangle=VR(length,width,height)
        print(format("Volume of a Rectangle",'30s'),format(volumeRectangle,'15.2f'))

Answer 2

点击VR命令时遇到问题。这是因为它有多个输入参数。你已经侥幸逃脱了它。在第一个命令（AC）中，因为它只有一个参数而eval将其转换为单个float值。

对于VR，有3个参数，您试图通过读取文件中的一行（即读取的3行）来设置每个参数。现在你的所有参数实际上都在一行上。所以，如果你认为你正在阅读参数

12, 3, 4.1

你不是在读书

2, 3, 4.1
AR
13, 3.25

当你eval这些你得到第1行和第3行的元组，并且因为AR是你定义的函数，eval('AR')会返回你的那个函数（这意味着异常错误）你收到的消息）。这是使用eval的危险之一，它可能会导致意外结果。

所以你的VR电话看起来像是

VR((2, 3, 4.1), AR, (13, 3.25))

这无疑不是你所期望的。

您可以通过两种方式解决它。为了清晰起见，我缩写了您的代码。你显然需要在其他命令中复制。

坚持tuples和ast.literal_eval（使用eval而不是import math from ast import literal_eval def VR(length,width,height): return length * width * height def main(): with open("lab10.input","r") as inFile: acttype = (inFile.readline()).strip() while (acttype != "###"): if (acttype=='VR'): params = literal_eval(inFile.readline()) volumeRectangle = VR(*params) print(format("Volume of a Rectangle",'30s'),format(volumeRectangle,'15.2f')) acttype = (inFile.readline()).strip() main()）。

eval

或通过在,上拆分行来避开import math def VR(length,width,height): return length * width * height def main(): with open("lab10.input","r") as inFile: acttype = (inFile.readline()).strip() while (acttype != "###"): if (acttype=='VR'): params = map(float, inFile.readline().split(',')) volumeRectangle = VR(*params) print(format("Volume of a Rectangle",'30s'),format(volumeRectangle,'15.2f')) acttype = (inFile.readline()).strip() main()。

Route::filter('no.session.cookie', function()
{
    Config::set('session.driver', 'array');
    Config::set('cookie.driver', 'array');
});

获取类型错误：不能将序列乘以非类型＆＃39;函数＆＃39;

2 个答案: