python - 在 stdout 上打印但无法在 Python 中写入文件

Question

我突然对 Python 的这种奇怪行为感到非常沮丧。我一直在向文件写入各种数据，但从今天早上开始，它似乎就不起作用了。在发布之前我已经提到了所有这些:

• How to redirect 'print' output to a file using python?
• Failed to write to file but generates no Error
• Unable to write data into a file using python
• Unable to write list of elements to a file using python

已经尝试了以下所有命令，但它只是没有向 delete.txt 文件写入任何内容。发生了什么事？

fl=open('delete.txt','w')
fl.write(msg) <--Doesnt work,tried this also
fl.write('%s' %msg) <--Doesnt work,tried this also
fl.write("at least write this") <-- Doesnt work,tried this also
print (msg) <- WORKS

代码:

for i in hd_com.comment_message[1:500]:
fl=open('delete.txt','wb')

try:
    if len(i)>40:
        mes=processComUni(i)
        proc=nltk.tokenize.word_tokenize(mes)
        #print proc
        pos=nltk.pos_tag(proc)
        for i in pos:
            if ((i[1]=="NN") or (i[1]=="NNP") or (i[1]=="NNS")) and len(i[0])>2:
                #print i[0],i[1]
                for j in home_depo_inv:
                    if i[0] in j.split() and (i[0]!='depot' and i[0]!='home' and i[0]!='store' and i[0]!='por' and i[0]!='get' and i[0]!='house' and i[0]!='find' and i[0]!='part' and i[0]!='son' and i[0]!='put' and i[0]!='lot' and i[0]!='christmas' and i[0]!='post'):
                        a=re.findall(i[0],j)
                        fl.write(str(i))<--Doesnt work,tried this also
                        fl.write(str(mes))<--Doesnt work,tried this also
                        fl.write("\n")<--Doesnt work,tried this also
                        fl.write("hello")<--Doesnt work,tried this also
                        fl.flush()
                        break
except:
    continue
fl.close()

更多代码:

type(mes) = str
mes="omg would love front yard"

Answer 1

您的代码段的缩进完全搞砸了，但无论如何:您的代码以:

for i in hd_com.comment_message[1:500]:
    fl=open('delete.txt','wb')

这意味着您在每次迭代时重新打开文件进行写入，删除上一次迭代可能写入的所有内容。