您想要这样的东西吗?

basename = "Station"
for i in range(1, 21):
    value = basename + "_" + str(i) + ".txt"
    print(value)

输出:

Station_1.txt
Station_2.txt
Station_3.txt
Station_4.txt
Station_5.txt
Station_6.txt
Station_7.txt
Station_8.txt
Station_9.txt
Station_10.txt
Station_11.txt
Station_12.txt
Station_13.txt
Station_14.txt
Station_15.txt
Station_16.txt
Station_17.txt
Station_18.txt
Station_19.txt
Station_20.txt