This module allows you to queue and launch processes using PySide's QProcess

TasksPool.py

"""
This module allows you to queue and launch processes using PySide's QProcess
"""
from PySide.QtCore import QObject, QProcess, Signal, QEventLoop
from PySide.QtGui import QApplication


class TasksPool(QObject):
    """
    This class allows you to add_task() for execution queue. Launch_list() starts the queue.
    """
    task_done = Signal()

    def __init__(self):

        super(TasksPool, self).__init__()
        self.tasks_pool = []
        self.process = None
        self.qapp = QApplication([])

    def add_task(self, command):
        """
        :type command: str
        :param command: A console command with arguments
        Adds a task to the pool for later execution
        """
        self.tasks_pool.append(command)

    def __execute_task(self, task):
        """
        :param task: Is a string used to start a process
        """
        process = QProcess(self)
        process.finished.connect(lambda *x: print(task, 'reports done'))
        process.finished.connect(self.task_done)
        process.readyRead.connect(lambda *x: print(str(process.readAll())))
        process.setProcessChannelMode(QProcess.MergedChannels)
        process.start(task)

    def launch_list(self):
        """
        Starts the execution of the queue in consecutive order, waiting for previous process to finish
        """
        for task in self.tasks_pool:
            loop = QEventLoop()
            self.task_done.connect(loop.quit)
            self.__execute_task(task)
            loop.exec_()