基于python中第一列与另一文本文件的匹配来选择第二列数据

with open('file1.txt', 'r') as file1:
    lines1 = file1.readlines()

with open('file2.txt', 'r') as file2:
    lines2 = file2.readlines()

data_dict = {}
for line in lines1:
    columns = line.split()
    if len(columns) >= 2:
        key = columns[0]
        data_dict[key] = None

selected_data = []
for line in lines2:
    columns = line.split()
    if len(columns) >= 2:
        key = columns[0]
        if key in data_dict:
            selected_data.append(columns[1])