Question

我正在尝试遍历feedlist.txt，我了解file()和open()的使用方式相同。我试图用较旧的ML书进行练习。

apcount={}
wordcounts={}
for feedurl in file('feedlist.txt'):
    title,wc=getwordcounts(feedurl)
    wordcounts[title]=wc
    for word,count in wc.items():
        apcount.setdefault(word,0)
        if count>1:
            apcount[word]+=1

Answer 1

看看这是否有帮助：

with open('feedlist.txt','r') as fp:
    filecontent = fp.readlines()
    title,wc = getwordcounts(filecontent)
    wordcounts[title]=wc
    for word,count in wc.items():
        apcount.setdefault(word,0)
        if count>1:
            apcount[word]+=1

with处理文件异常，仅在文件存在时执行with后的命令。

Answer 2

要循环显示每一行，就像在原始行中一样，这里使用open等效。这将在离开with块后关闭文件。与原文一样，一次只有一行传递给getwordcounts()。

with open('feedlist.txt') as f:
    for feedurl in f:
        title,wc=getwordcounts(feedurl)
        wordcounts[title]=wc
        for word,count in wc.items():
            apcount.setdefault(word,0)
            if count>1:
                apcount[word]+=1

如何更改使用file（）函数的代码块现在使用open（）函数

2 个答案: