Jython/Python 全局找不到名称

Question

请帮帮我，我遇到了这个错误：

diagonal Name not found globally.
A local or global name could not be found. You need to define the function or variable before you try to use it in any way.

您能否帮助我如何使用 print.now() 并显示三个变量。谢谢

 def computeSquareFeatures(p):

  p = input("Enter square side length:")
  area = p*p
  perimeter = p*4
  diagonal = math.sqrt(2*(p**2))

  print.Now("Area is %d, Perimeter is %d, Diagonal length is %d") % area, perimeter, diagonal

computeSquareFeatures(p)

Answer 1

您正在传递 p 但未在传递之前声明它：

computeSquareFeatures(p)

您在函数内部使用 input 设置了 p。

您还需要在函数内创建 p 一个 int 否则您的面积计算不会按照您的想法进行，请确保您已导入数学并且 print.Now 似乎也不正确.

一个工作函数的例子：

import math
# removed p as you are taking getting it as input
def computeSquareFeatures():
  p = int(raw_input("Enter square side length: "))
  area = p*p
  perimeter = p*4
  diagonal = math.sqrt(2*(p**2))
  print("Area is %d, Perimeter is %d, Diagonal length is %d") %(area, perimeter, diagonal)

computeSquareFeatures()

它的工作原理如下：

$jython jt.py
Enter square side length:33
Area is 1089, Perimeter is 132, Diagonal length is 46

Jython/Python 全局找不到名称

Jython/Python Name not found globally

python

jython