创建和使用模块 "float object not callable" -Python 3.5.1

Question

完全新手在此学习。我应该创建一个我相信我已经在这里完成的模块：

import math

def circum(x):
    return 2 * math.pi * x (format (",.3f"))

def area(x):
    return math.pi * x **2 (format (",.3f"))

我已将此模块命名为 mycircle。现在我必须导入这个模块并用它来计算圆的周长和面积。我的代码是：

import mycircle

def main():
    radius = float (input ("Please enter the radius of the circle: "))
    circumference = mycircle.circum (radius)
    area = mycircle.area (radius)
    print ("The circumference of the circle is ", format    (mycircle.circum, ",.3f"),  sep="")
    print ("The area of the circle is ", format (mycircle.area, ",.3f"), sep="")

main()

但是，我收到错误消息：

 File "C:/Users/Jameson/Desktop/COP 1000/Chapter 5/54.py", line 26, in <module>
main()
  File "C:/Users/Jameson/Desktop/COP 1000/Chapter 5/54.py", line 21, in main
circumference = mycircle.circum (radius)
File "C:/Users/Jameson/Desktop/COP 1000/Chapter 5\mycircle.py", line 4, in circum
return 2 * math.pi * x (format (",.3f"))
TypeError: 'float' object is not callable

我只能假设它是愚蠢的。任何帮助将不胜感激！我被困在这里。

Answer 1

2 * math.pi * x

是一个float。当后面跟着一对 '()' 时，python 认为你在像函数一样调用它，但 float 是不可调用的。因此错误。

要修复它，该行（以及您的 area 函数中的类似行）应更改为

return format(2 * math.pi * x, ",.3f")

另外，请注意您进行了两次格式化：一次在 circum 和 area，然后在打印时在 main。你只需要做一次。让 circum 和 area 简单地 return 浮动更有意义，并且仅在打印它们时格式化值（在 main 中）。

编辑：

两个print调用也是错误的：

print ("The circumference of the circle is ", format(mycircle.circum, ",.3f"),  sep="")
print ("The area of the circle is ", format(mycircle.area, ",.3f"), sep="")

mycircle.circum和mycircle.area是函数，不是你在main中计算的周长和面积。这些应该改为

print ("The circumference of the circle is ", format(circumference, ",.3f"),  sep="")
print ("The area of the circle is ", format(area, ",.3f"), sep="")

创建和使用模块 "float object not callable" -Python 3.5.1

Creating and using module "float object not callable" -Python 3.5.1

python

module

python-3.5

callable