Упорядочить элементы по возрастанию

import random as rd
class Clothes:
    def __init__(self,material,price,color,country,sale,size, arr):
        self.material = material
        self.price = price
        self.color = color
        self.country = country
        self.sale = sale
        self.size = size
 
    def view_all(self):
        print("material-", self.material," price-", self.price, " color-", self.color, " country-", self.country, " sale-", self.sale, " size-",self.size)
        
        
lstClass=[]
material_lst=["Кожа","Шелк","Хлопок","Лен"]
price_lst=["300","1200","20000","4500", "5500"]
color_lst=["Red","Green","Blue","Dark"]
country_lst=["Russia","Ukraine","USA","Portugal"]
sale_lst=["30%","1%","5%","70%", "80%"]
size_lst=["L", "XXL","XL", "S", "M"]
for i in range(1,20):
    lstClass.append(Clothes(material_lst[rd.randint(0,len(material_lst)-1)],
    price_lst[rd.randint(0,len(price_lst)-1)],                       
    color_lst[rd.randint(0,len(color_lst)-1)],
    country_lst[rd.randint(0,len(country_lst)-1)],
    sale_lst[rd.randint(0,len(sale_lst)-1)],
    size_lst[rd.randint(0,len(size_lst)-1)],
    
 
    rd.randint(0,100)))
    
for i in range(len(lstClass)):
    a=lstClass[i]
    a.view_all()

>>> price_lst=["300","1200","20000","4500", "5500"]
>>> price_lst.sort()
>>> price_lst
['1200', '20000', '300', '4500', '5500']

>>> price_lst=["300","1200","20000","4500", "5500"]
>>> price_lst.sort(key = lambda x : int(x))
>>> price_lst
['300', '1200', '4500', '5500', '20000']
>>>