关于python：不像编程经验那样编码问题

hitting a wall with debugging; not a coding issue as much as one of programming experience

在一个小的圆形区域工作。我无法解决调试阶段出现的问题。诸如"外部引用的变量…"和其他不会处理简单方程的错误(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，什么也没用。我的解决方案要么创建一个新问题，要么不解决手头的问题。我已经学习了三个星期的Python，但是我有COBOL的编程经验，所以我了解了函数和流程图的概念。

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行。

谢谢你的帮助。

通量

添加：

圆面积和半径：

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# 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.