因为我们在这里遇到了一些问题，所以使用regex是有意义的，如下所示：

from re import search

for i in list1:
    print(m[0] if (m:=search('|'.join(list2),i)) else 'not found')

>>>
'''
black
not found
black
blue
black
blue
not found
blue
black

也可以使用列表解析

list1 = ['moonlight black','mint cream','electric black','deep blue','black','blue','flowing silver','crystal blue','ink black']
list2 = [print('black') if 'black' in color else print('blue') if 'blue' in color else print('not found') for color in list1]

更新您的代码：

list1 = ['moonlight black','mint cream','electric black','deep blue',
         'black','blue','flowing silver','crystal blue','ink black']
list2 = ["blue","black"]
         
for i in list1:
    for j in list2:
        if j in i:
            print(j)
            break 
    else:
        print("not found")