如何將列表中的數字相乘（刪除重複項後）？

Question

我正在使用Python 3.2.3 IDLE。我看到有些人使用reduce命令，但由於某種原因，我沒有它。就像代碼不會出現在紫色中一樣，它會將reduce當作變量來識別。

這裏是我的代碼部分：

numbers = [10, 11, 11] 
numbertotal = (set(numbers)) 
#removes duplicates in my list, therefore, the list only contains [10, 11] 
print ("The sum of the list is", (sum(numbertotal))) #sum is 21 
print ("The product of the list is" #need help here, basically it should be 10 * 11 = 110 

我基本上要乘以名單後，我刪除重複的numbertotal。

Answer 1

你reduce躲在：

from functools import reduce 

print("The product of the list is", reduce(lambda x,y:x*y, numbertotal)) 

或

from functools import reduce 
import operator as op 

print("The product of the list is", reduce(op.mul, numbertotal)) 

在python3它已經被移動到functools。 The 2to3 handles this case。

Answer 2

這是否適合您？

product = 1 
for j in numbertotal: 
    product = product * j 
print 'The product of the list is', product