Python子进程和目录上的运行脚本

Question

Im trying to run subprocess. Im running a python file on a directory (to convert each file in the directory.) The convertor works and ive been implementing this into a gui(PYQT4). Here is what I got so far:

def selectFile(self):



    self.listWidget.clear() # In case there are any existing elements in the list
    directory = QtGui.QFileDialog.getExistingDirectory(self,
                                                       "Pick a folder")


    if directory:
        for file_name in os.listdir(directory):
            if file_name.endswith(".csv"):
                self.listWidget.addItem(file_name)
                print (file_name)




def convertfile(self, directory):

    subprocess.call(['python', 'Createxmlfromcsv.py', directory], shell=True)

The error im getting is ..

Traceback (most recent call last):
  File "/Users/eeamesX/PycharmProjects/Workmain/windows.py", line 162, in convertfile
    subprocess.call(['python', 'Createxmlfromcsv.py', directory], shell=True)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 522, in call
    return Popen(*popenargs, **kwargs).wait()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 710, in __init__
    errread, errwrite)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 1335, in _execute_child
    raise child_exception
TypeError: execv() arg 2 must contain only strings

Any help for a beginner is appreciated :)

Answer 1

From the comments to the question, the line:

    self.convertButton.clicked.connect(self.convertfile)

will send False to the convertfile method when the button is clicked, which is why you see that error.

You need to add some code to convertfile which gets the directory path from the selected item in the list-widget. Something like:

    item = self.listWidget.currentItem()
    if item is not None:
        directory = unicode(item.text())
        subprocess.call(['python', 'Createxmlfromcsv.py', directory])

But note that you are not storing the full directory path in the list-widget, and so the subprocess call may fail. You should really add items to the list-widget like this:

    self.listWidget.addItem(os.path.join(directory, file_name))

Answer 2

在“ subprocess.call（['python'，'Createxmlfromcsv.py'，directory]，shell = True）”中，“ directory”变量不是字符串。