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process = subprocess.Popen(['dir'], stdout=subprocess.PIPE)

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Traceback (most recent call last):
  File "<pyshell#7>", line 1, in <module>
    process = subprocess.Popen(['dir'], stdout=subprocess.PIPE)
  File "C:\Python33\lib\subprocess.py", line 818, in __init__
    restore_signals, start_new_session)
  File "C:\Python33\lib\subprocess.py", line 1096, in _execute_child
    raise WindowsError(*e.args)
FileNotFoundError: [WinError 2] Das System kann die angegebene Datei nicht finden

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import os
from glob import glob
from subprocess import PIPE, Popen


def main():
    for pdf_filename in glob('*.pdf'):
        target_path = os.path.join(
            'sig-pdf', os.path.splitext(pdf_filename)[0] + '_sig.pdf'
           )
        print (pdf_filename, '->', target_path)
    
        
        process = Popen(
            [
                'java',
                '-jar', 'PortableSigner.jar',
                '-b', 'de',
                '-c', 'Dieses Dokument wurde signiert.',
                '-i', 'Bildmarke.jpg',
                '-n',
                '-t', pdf_filename,
                '-o', target_path,
                '-s', 'zert.key',
                '-p', 'password'
            ]
            ,stdout=PIPE
        )
        output, _ = process.communicate()
        return_code = process.wait()


if __name__ == '__main__':
    main()

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C:\Program Files\Java\jre7\bin

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 process = Popen(
            [
                'C:\\Program Files\\Java\\jre7\\bin\\java.exe',

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 process = Popen(
            [
                'C:\Program Files\Java\jre7\bin\java.exe',