python - 将列表中的单词与文件中的单词进行比较

Question

我正在尝试编写一个程序，该程序循环遍历列表并检查文件以查看该单词是否在其中。首先，读取文件，然后如果找到单词，则会跳出循环。对于找到该单词后文件中的剩余行，我想与列表进行比较。下面的代码不起作用。它只是跳出了循环并且没有找到这个词。感谢你的协助。

def readFile():
with open("file.txt", "r") as myfile:
    for line in myfile:
        if "Hello" in line:
            break
    for word in mylist:
        if word in myfile:
           print(word + "found")

Answer 1

您将需要另一个 for 行 in myfile 循环。您无法执行 if word in myfile 来检查整个文件，您仍然需要循环遍历每一行。

with open("file.txt", "r") as myfile:
    for line in myfile:
        if "Hello" in line:
            break
    for line in myfile:
        for word in mylist:
            if word in line:
                print(word + "found")

请注意，这可能会多次打印同一个单词。如果您不想这样做，则需要跟踪您已经看过的单词。

already_seen = set()        

for line in myfile:
    for word in mylist:
        if word in already_seen:
            continue

        if word in line:
            print(word + "found")
            already_seen.add(word)