# a = [10,20,30,20,10,50,60,40,80,50,40]
# a = list(dict.fromkeys(a))
# print(a)
# color = ['Red', 'Green', 'White', 'Black', 'Pink', 'Yellow']
# color.pop(0)
# color.pop(4)
# color.pop(3)
# for i in color:
#     print(i)
# i = 0
# while i<(len(color)):
#     print(color[i])
#     i+=1
#
#
# list1 = [1, 3, 5, 7, 9]
# list2 = [1, 2, 4, 6, 7, 8]
# list3 = (list(set(list1) - set(list2)))
# print(list3)
# list1 = [1, 2, 3, 0]
# list2 = ['Red', 'Green', 'Black']
# list1.append(list2)
# print(list1)
#
#
#
#
#
#
# def num_range(num):
#     for i in range(num):
#         print(i)
#
# num_range(100)
# num_range(50)
# def add(num1,num2):
#     sum = num1+num2
#     return sum
#
# def div(num1,num2):
#     sum = add(num1,num2)
#     res = (sum)/2
#     return res
# res = div(10,10)
# print(res)


#
# import os
# if os.path.exists("demofile.txt"):
#   os.remove("demofile.txt")
# else:
#   print("The file does not exist")
#






