在Python

时间:2018-04-13 14:22:29

标签: python python-3.x oop

行。我正在建立一个模型,描述一些管理决策对森林的影响。每个林都是林类的一个实例,您可以在下面看到简化版本:

class forest():
     instancelist = [] # a list of all the forest instances so I can run functions on all of them at once

     growth_rate = 2 #very simple rate of growth (not realistic!)
     felling_year = 50 #all forest areas are felled at age 50

     def __init__(self, x=0, y=0,age=0,size=0): 
         self.instancelist.append(self) # add the forest area to the instance list
         self.x = x # x coordinate
         self.y = y # y coordinate
         self.age = age # age, not all forests are planted on bare sites, - we have some pre-existing ones to consider.
         self.size = size # very rough - but this is an indicator of the physical volume of timber (not area)

我现在可以生成一个林对象,例如:

f = forest(1,1,20,40)

所以,我遇到的困难是我需要生成一些森林块(所以我们看到效果在更广泛的区域)。要做到这一点,我需要创建很多领域。

如果我没有指定任何属性,我可以轻松地做到这一点:

forests = [forest() for x in range(20)]

但我无法看到如何生成大量具有独特属性的区域,而无需通过手动指定它们。是否有一种方法可以用于从其他来源(列表,元组,csv等)提供数据并使用它来构建不同对象的清单?

很抱歉,如果这是一个愚蠢的问题(我不时会问他们),但这让我很困惑。

1 个答案:

答案 0 :(得分:2)

如果您将属性存储在列表列表中,这是一种方法:

class Forest(object):
    def __init__(self, w, x, y, z):
        self.w = w
        self.x = x
        self.y = y
        self.z = z
        return None

properties = [[1, 2, 3, 4],
              [5, 6, 7, 8],
              [9, 10, 11, 12],
              [13, 14, 15, 16],
              [17, 18, 19, 20]]

forests = [Forest(*p) for p in properties]

print(forests[1].x)  # 6