由python中的同一個數組中的每個元素添加數組中的每個元素

Question

我需要將數組中的每個元素添加到同一個數組中的每個元素，然後將結果添加到新數組中。我曾嘗試

my_list = [] 

for filename in [my_file]: 
    with open(filename) as f: 
     my_list += [int(i) for line in f for i in line.split()] 

answer = [] 

for elem in my_list: 
    answer += [elem + elem] 

print answer 

當my_list = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]，該程序將打印[2, 4, 6, 8, 10, 12, 14, 16, 18, 20]這是不正確。我怎樣才能解決這個問題？

Answer 1

你可以試試這個：

my_list = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] 

answer = [i+a for i in my_list for a in my_list] 

輸出：

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