查找字符串之间的精确匹配

我试图创建一个函数来获得df列的某些字符串，只有在列表中与字符串完全匹配时。下面是一个例子:

my_list = ['Lys', 'Lysol', 'Cla', 'Clarins']
def test(row):
for i in my_list:
if i in row['Product']:
return i
else:
return row['Product']
df['Exact_match'] = df.apply(test, axis=1)

输出:

def find_str(row, list_):
words = row.split(' ')
for elem in words:
for search_str in list_:
if search_str in elem:
return elem

return row
df['Exact_match'] = df['Product'].apply(find_str, list_=my_list)