调试碰壁；不是编码问题，而是编程经验问题

Question

在小范围的圆形程序上工作。调试阶段出现的问题我一直没能解决。错误，如“外部引用的变量…”和其他无法处理简单公式的错误（例如半径=面积/PI*半径）。我尝试了很多方法来解决这个问题，除了重写整个程序之外，什么都不管用。我的解决方案要么产生新问题，要么解决不了眼前的问题。我已经学习了三个星期的python，但是有使用COBOL编程的经验，所以我理解函数和流程图的概念。你知道吗

当你没有解决问题的头脑或工具时，你会怎么做？我想自己解决这些问题。寻求帮助是明智的，但最终你必须自己飞。你知道吗

谢谢你的帮助。你知道吗

焊剂

附加：

圆面积和半径：

# Exercise 1 Area of Circle
# This prog will ask for circle dimensions and compute
# area/radius for the user, then display figures, and
# allow to repeat.

import sys
import pdb
PI = 3.14
radius = 0


print ('''Welcome to Ursavion, the leader in math apps
This app allows you to quickly and easily find
either the area or radius for a circle.''')
print ( )


def chooseAR ( ):
    print ('Do you need to find circle area or circle radius? Enter A/a or A/r. ')
    choice = input ( )
    if choice in ['A', 'a']:
        areaSol ( )

    elif choice in ['R', 'r']:
        radSol (radius)

    else:
        print ('Please enter either A/a or R/r. ')
        chooseAR ( )

def areaSol ( ):
    radius = 0
    radius = input ('What is the radius of the circle? ')
    radius = int (radius)

    area = PI * radius**2 

    radius = str(radius)
    area = str(area)

    print ('The area of a circle with radius ' + radius + ' is ' + area + ' units '         squared')
    print ( )
    print ('Calculate another? y/n ')
    again = input ( )
    if again in [ 'y', 'n']:
        chooseAR ( )

    else:
        print ('Thank you for using this app.')


def radSol (radius):
    #pdb.set_trace( )                   #r = 1.128 for A = 4 
    area = input ('What is the area of the circle? ')
    area = int(area)
    radius = int(radius)

    radius = area / 3.14 * radius       #prog will not eval this formula; float pt prob


    radius = str(radius)
    area = str(area)    

   print ('The radius of a circle with area ' + str(area) + ' is ' + str(radius) + '   units')
   print ( )
   again = input ('Calculate another? y/n ')
   if again in ['Y', 'y', 'N', 'n']:
       chooseAR( )

   else:
        print ('Thank you for using this app.')


chooseAR ( )  # This function is one problem. Program initializes all 
              # functions on first pass, but it needs "chooseAR" here to allow the 
              # program to start, else it never runs; however, the "chooseAR" sets up
              # an infinite loop if it exists here. 

Answer 1

正如你自己正确地说的，这与经验有关。你的经验越丰富，你就越不可能就每一个小问题问别人。你知道吗

但是为了获得这种经验和进步，你必须克服这些小问题，所以提问无疑是一种有效的方法。你知道吗

只要你试着从错误中吸取教训（如果有人这么说的话），一切都应该是好的。你知道吗

不管怎么说，有些调试器真的很麻烦。你知道吗