如何從一個對象的實例獲取變量到同一文件中的另一個對象？

Question

我試圖從同一個文件中的另一個對象獲取最大值和最小值。但它一直返回「對象沒有屬性'max_value'」。有人能告訴我如何獲得對象的每個實例的變量嗎？以下是完整代碼：

from math import * 
from graphics import * 


def compute_min_and_max(expression): 

    #Various constants 
    print("Evaluating ", expression) 
    min_value = 1e200 
    max_value = -1e200 


    #Gets maximum and minimum for x between 0 and 10 
    for i in range(0, 1001): 

     try: 
      x = i/100.0 
      y = eval(expression) 
      min_value = min(y, min_value) 
      max_value = max(y, max_value) 

     except Exception: 
      print("For ", x, " the expression is invalid") 
      pass 


    print("Your min and max numbers are *drum roll*...") 
    return(min_value, max_value) 


def compute_min_and_max_for_file(filename): 

    global_min = 1e200 
    global_max = -1e200 
    opened_function_file = open(filename, 'r') 

    #Gets global max and min 
    for line in opened_function_file: 
     compute_min_and_max(line) 
     global_max = max(compute_min_and_max(line).max_value, global_max) 
     global_min = min(compute_min_and_max(line).min_value, global_min) 


    #Closes file, and returns the values 
    opened_function_file.close() 
    return (global_min, global_max) 

Answer 1

您沒有任何對象。您只有函數，並且max_value名稱是局部變量。

您確實返回了min_value和max_value的元組，但您忽略該返回。使用元組賦值來捕獲兩者：當然，啊！當然，使用元組賦值來捕獲兩者：

for line in opened_function_file: 
    min_value, max_value = compute_min_and_max(line) 
    global_max = max(max_value, global_max) 
    global_min = min(min_value, global_min)