python - 使用 Python 对 txt 文件进行排序

Question

我需要一些帮助来打印出经过排序的 txt 日志文件。打印没有问题，只是我不想多次打印同一个 IP 号码。

这是我的代码。

    text_file = open("access_log.txt")
entire_file = text_file.readlines()
text_file.close()

for line in reversed(entire_file):
    try:
        arr = line.split(' ')
        date = arr[3] 
        print arr[0], "- - ", date[1:], " ",arr[6] 
    except IndexError, e:
        error = e

如您所见，我只想打印出 IP 号、日期和访问过的页面。但只有一次来自类似的 IP。

好吧，你可能会看到我是一个完全的初学者 =)谢谢

Answer 1

# empty set of already seen ips:
seen_ips = set()

with open("access_log.txt") as f:
    for line in lines:
        arr = line.split(' ')
        date = arr[3] 

        # if the ip still not seen, then print and add it to the seen_ips set:
        if arr[0] not in seen_ips:
            print arr[0], "- - ", date[1:], " ",arr[6]
            seen_ips.add(arr[0])
        # else (i.e. ip already seen) ignore and go on with the next line