运行代码的这一部分时，我总是收到错误消息。我已经尝试按照universal_newlines=True文档的建议实施subprocess.check_output，但是遇到了同样的错误。为什么会发生这种情况，我该怎么解决？
for filename in os.listdir(directory):
if filename in new_list:
pdf = filename
output = subprocess.check_output(['pdftotext', '-layout', pdf, '-'], universal_newlines=True).decode()
pages = output.strip('\f').split('\f')
page = pages[-1]
错误消息：
---------------------------------------------------------------------------
CalledProcessError Traceback (most recent call last)
<ipython-input-153-adc4a58d7f21> in <module>
9 if filename in new_list:
10 pdf = filename
---> 11 output = subprocess.check_output(['pdftotext', '-layout', pdf, '-'], universal_newlines=True).decode()
12 pages = output.strip('\f').split('\f')
13 page = pages[-1]
/usr/lib/python3.8/subprocess.py in check_output(timeout, *popenargs, **kwargs)
409 kwargs['input'] = '' if kwargs.get('universal_newlines', False) else b''
410
--> 411 return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
412 **kwargs).stdout
413
/usr/lib/python3.8/subprocess.py in run(input, capture_output, timeout, check, *popenargs, **kwargs)
510 retcode = process.poll()
511 if check and retcode:
--> 512 raise CalledProcessError(retcode, process.args,
513 output=stdout, stderr=stderr)
514 return CompletedProcess(process.args, retcode, stdout, stderr)
CalledProcessError: Command '['pdftotext', '-layout', 'coburns.pdf', '-']' returned non-zero exit status 1.
答案 0 :(得分：0)
如评论中所述，check_output实际上是在过程返回的代码不是$(document).ready(function() {
$.get("https://api.rss2json.com/v1/api.json?rss_url=https%3A%2F%2Ftimesofindia.indiatimes.com%2Frssfeeds%2F-2128816011.cms&api_key=mkzfaqsb5gtninv1pddoke81vwmjlyfiissiitvd", function(data, status) {
//$("#rowview").empty();
for (i in data.items) {
console.log(data.items[i].thumbnail);
console.log(data.items[i].title);
console.log(data.items[i].link);
console.log(data.items[i].description);
console.log(data.items[i].description.slice(pos + 4));
var pos = data.items[i].description.indexOf("</a>"),
$divitem = $("</div>").attr('class', 'item grid-group-item col-xs-4 col-lg-4 col-md-6 col-sm-12');
var $divthumb = $("</div>").attr({ "class": 'thumbnail card border-light', style: 'width: 20rem' }),
$divimg = $("</div>").attr('class', 'img-event '),
$imggrp = $("</img>").attr({ "class": 'group list-group-image img-fluid ', src: data.items[i].thumbnail }),
$divcaption = $("</div>").attr('class', 'caption card-body'),
$headcard = $("</h4>").text(data.items[i].title).attr('class', 'group card-title inner list-group-item-heading'),
$paracard = $("</p>").attr('class', 'group inner list-group-item-text').text(data.items[i].description.slice(pos + 4)),
$divrow = $("</div>").attr('class', 'row'),
$divfooter1 = $("</div>").attr({ "class": 'col-xs-12 col-md-6', id: 'footer1' }),
$lead = $("</p>").attr('class', 'lead').text('$21.000'),
$divfooter2 = $("</div>").attr({ "class": 'col-xs-12 col-md-6', id: 'footer2' }),
$atag = $("</a>").attr({ class: 'btn btn-success', href: 'http://www.jquery2dotnet.com' }).text("Add to cart");
$("#rowview").append($divitem.append($divthumb.append([$divimg.append($imggrp), $divcaption.append([$headcard, $paracard, $divrow.append([$divfooter1.append($lead), $divfooter2.append($atag)])])])));
// $($divthumb).append([$divimg, $divcaption]);
//$($divimg).append($imggrp);
// $(divthumb).append(divcaption);
//$($divcaption).append([$headcard, $paracard, $divrow]);
// $(divcaption).append(paracard);
//$(divcaption).append(divrow);
//$($divrow).append([$divfooter1, $divfooter2]);
//$($divfooter1).append($lead);
//$(divrow).append(divfooter2);
// $($divfooter2).append($atag);
// $(".view-group").append($divitem);
}
});
});
时引发CalledProcessError。
此处的代码为0，表示1无法打开pdf，原因可能是它不正确或因为找不到它。
您正在使用os.listdir，它产生的文件名相对于pdftotext参数，它不一定与directory将在其中启动{{ 1}}。
我可以看到三种解决方案：
check_output的{{1}}参数在pdftotext中启动cwd，os.path.join(directory, filename)或pathlib.Path(directory)/filename来重建文件的相对路径，os.scandir替换对check_output的调用，这将产生同时具有pdftotext和directory属性的DirEntry对象，您可以分别使用在您的测试中，并作为os.listdir的参数。