我有以下代码：
class Product(Cylinder): ### Creates a child class of Cylinder called Product
def __init__(self, height, radius, name): ### new class paramenter, we now have name
super().__init__(height, radius) ### inherits the previous initial viables, no need to rewrite.
self.name = name ### name is now a new parameter.
def objectName(self): ### new functions to return the name of the object
return self.name
#### The bit about csv spreadsheets
import csv ### imports the csv module
with open('shopping.csv') as csv_file: ### opens the csv file
reader = csv.reader(csv_file) ### defines the variable containing the information
next(csv_file) ### goes to the next line, ignoring the title
products = ["name","radius","hieght"] ### create's a base array for the information to be written to
for row in reader: ### for each row
products = np.vstack((products,row)); ### writes each row of the imported file to the array
products = np.delete(products, (0), axis=0) ### removes the non-useful information (row 0)
products[:,[0, 2]] = products[:,[2, 0]] ### switches first and third row to match our class and function inputs
print(products)
list_of_products = [Product(height, radius, name) for (height, radius, name) in products]
print(list_of_products)
在代码的前几行中，Cylinder类还具有其他功能：
self.height = height ### defines the variables
self.radius = radius
def volume(self): ### the volume function
return np.pi * np.power(self.radius,2) * self.height; ### just the equation of volume
def area(self):
return 2 * np.pi * (self.radius * self.height + np.power(self.radius,2)) ### eq. of surface area
def baseArea(self):
return np.pi * np.power(self.radius,2) ### equation of a circle, one base of the cylinder
def lateralArea(self):
return 2 * np.pi * self.radius * self.height ### equation of the lateral area
def circumference(self):
return 2 * np.pi * self.radius ### radius of a circle
代码工作正常。我的问题是，使用对象列表（产品类），是否有一种简单的方法来创建第二个列表，例如，使用“ objectname” .volume（）。 list_of_products列表仅包含Product类的对象。如果可能，我想避免导入除numpy之外的任何内容。 真的很感谢您的帮助，如果这是一个初学者的问题，我感到抱歉，我只是其中的一段日子。