pyqt - Print out Python console output to Qtextedit

Question

I have the output like this, when I press the button:

['VERSION', 'ROMMON', 'HOSTNAME', 'UPTIME', 'RUNNING_IMAGE', 'HARDWARE', 'SERIAL', 'CONFIG_REGISTER']

['12.2(55)SE7', 'Bootstrap', 'Revo-Solusindo-01', '1 hour, 27 minutes', 'c2960s-universalk9-mz.122-55.SE7.bin', ['WS-C2960S-24PD-L'], ['FOC1644Z129'], '0xF'] Write 1 records

['FAN', 'TEMPERATURE', 'TEMPERATURE_VALUE', 'TEMPERATURE_STATE', 'YELLOW_THRESHOLD', 'RED_THRESHOLD', 'POWER', 'RPS']

['OK', 'OK', '33', 'GREEN', '54', '64', '', ''] Write 1 records

['TOTAL', 'FFREE']

['57931776', '29178368']

['524288', '523212'] Write 2 records

['MEMTYPE', 'HEAD', 'TOTAL', 'USED', 'FREE', 'LOW', 'LARGE']

['Processor', '2BA9598', '73910760', '26908308', '47002452', '45367928', '30211716']

[' I/O', '6200000', '14680064', '12406764', '2273300', '2273300', '2273024']

['Driver te', '1A00000', '1048576', '44', '1048532', '1048532', '1048532'] Write 3 records

['CPU_5_SEC', 'CPU_1_MIN', 'CPU_5_MIN']

['10', '10', '9'] Write 1 records

How can I print the output of the background process to Qtextedit?

My code:

import sys
from PyQt4 import QtGui, QtCore
import jtextfsm as textfsm

class Window(QtGui.QMainWindow):
    def __init__(self):
        super(Window, self).__init__()
        self.setGeometry(50, 50, 500, 300)
        self.setWindowTitle("PyQT tuts!")
        self.setWindowIcon(QtGui.QIcon('pythonlogo.png'))
        self.home()

    def home(self):
        btn = QtGui.QPushButton("Generate", self)
        btn.clicked.connect(self.TextFSM)
        btn.resize(100, 50)
        btn.move(50, 50)

        process  = QtGui.QTextEdit(self)
        process.moveCursor(QtGui.QTextCursor.Start)
        process.ensureCursorVisible()
        process.setLineWrapColumnOrWidth(500)
        process.setLineWrapMode(QtGui.QTextEdit.FixedPixelWidth)
        process.setFixedWidth(400)
        process.setFixedHeight(150)
        process.move(50,100)

        self.show()

    def TextFSM(self):

        nameFile = 'Switch'

        try:
            input_file = open(nameFile + '.txt', encoding='utf-8')  # show version
            raw_text_data = input_file.read()
            input_file.close()

            input_file2 = open(nameFile + '.txt', encoding='utf-8')  # show env
            raw_text_data2 = input_file2.read()
            input_file2.close()

            input_file3 = open(nameFile + '.txt', encoding='utf-8')  # show flash
            raw_text_data3 = input_file3.read()
            input_file3.close()

            input_file4 = open(nameFile + '.txt', encoding='utf-8')  # show memory statistic
            raw_text_data4 = input_file4.read()
            input_file4.close()

            input_file5 = open(nameFile + '.txt', encoding='utf-8')  # show process cpu
            raw_text_data5 = input_file5.read()
            input_file5.close()

            template = open("show-version.textfsm")  # show version
            re_table = textfsm.TextFSM(template)
            fsm_results = re_table.ParseText(raw_text_data)

            template2 = open("show-env.textfsm")  # show env
            re_table2 = textfsm.TextFSM(template2)
            fsm_results2 = re_table2.ParseText(raw_text_data2)

            template3 = open("show-flash.textfsm")  # show flash
            re_table3 = textfsm.TextFSM(template3)
            fsm_results3 = re_table3.ParseText(raw_text_data3)

            template4 = open("show-memory-statistic.textfsm")  # show memory statistic
            re_table4 = textfsm.TextFSM(template4)
            fsm_results4 = re_table4.ParseText(raw_text_data4)

            template5 = open("show-process-cpu.textfsm")  # show process cpu
            re_table5 = textfsm.TextFSM(template5)
            fsm_results5 = re_table5.ParseText(raw_text_data5)

            outfile_name = open(nameFile + "-show-version.csv", "w+")  # show version
            outfile = outfile_name

            outfile_name2 = open(nameFile + "-show-env.csv", "w+")  # show env
            outfile2 = outfile_name2

            outfile_name3 = open(nameFile + "-show-flash.csv", "w+")  # show flash
            outfile3 = outfile_name3

            outfile_name4 = open(nameFile + "-show-memory-statistic.csv", "w+")  # show memory statistic
            outfile4 = outfile_name4

            outfile_name5 = open(nameFile + "-show-process-cpu.csv", "w+")  # show process cpu
            outfile5 = outfile_name5

            print(re_table.header)  # show version
            for s in re_table.header:
                outfile.write("%s;" % s)
            outfile.write("
")

            counter = 0
            for row in fsm_results:  # show version
                print(row)
                for s in row:
                    outfile.write("%s;" % s)
                outfile.write("
")
                counter += 1
            print("Write %d records" % counter)

            print(re_table2.header)  # show env
            for s in re_table2.header:
                outfile2.write("%s;" % s)
            outfile2.write("
")

            counter = 0
            for row in fsm_results2:  # show env
                print(row)
                for s in row:
                    outfile2.write("%s;" % s)
                outfile2.write("
")
                counter += 1
            print("Write %d records" % counter)

            print(re_table3.header)  # show flash
            for s in re_table3.header:
                outfile3.write("%s;" % s)
            outfile3.write("
")

            counter = 0
            for row in fsm_results3:  # show flash
                print(row)
                for s in row:
                    outfile3.write("%s;" % s)
                outfile3.write("
")
                counter += 1
            print("Write %d records" % counter)

            print(re_table4.header)  # show memory statistics
            for s in re_table4.header:
                outfile4.write("%s;" % s)
            outfile4.write("
")

            counter = 0
            for row in fsm_results4:  # show memory statistics
                print(row)
                for s in row:
                    outfile4.write("%s;" % s)
                outfile4.write("
")
                counter += 1
            print("Write %d records" % counter)

            print(re_table5.header)  # show process cpu
            for s in re_table5.header:
                outfile5.write("%s;" % s)
            outfile5.write("
")

            counter = 0
            for row in fsm_results5:  # show process cpu
                print(row)
                for s in row:
                    outfile5.write("%s;" % s)
                outfile5.write("
")
                counter += 1
            print("Write %d records" % counter)
        except IOError:
            print("Error: There Have File does not appear to exist.")
            QtGui.QMessageBox.question(self, 'Warning', "ERROR:Please check you're '.txt' file and TextFSM File.")


def run():
    app = QtGui.QApplication(sys.argv)
    GUI = Window()
    sys.exit(app.exec_())


run()

Answer 1

The output consoles produced by Python are written to the program output streams sys.stdout (normal output) and sys.stderr (error output, such as exception tracebacks). In this case we will use stdout

class Stream(QtCore.QObject):
    newText = QtCore.pyqtSignal(str)

    def write(self, text):
        self.newText.emit(str(text))

class Window(QtGui.QMainWindow):
    def __init__(self):
        super(Window, self).__init__()
        self.setGeometry(50, 50, 500, 300)
        self.setWindowTitle("PyQT tuts!")
        self.setWindowIcon(QtGui.QIcon('pythonlogo.png'))
        self.home()

        sys.stdout = Stream(newText=self.onUpdateText)

    def onUpdateText(self, text):
        cursor = self.process.textCursor()
        cursor.movePosition(QtGui.QTextCursor.End)
        cursor.insertText(text)
        self.process.setTextCursor(cursor)
        self.process.ensureCursorVisible()

    def __del__(self):
        sys.stdout = sys.__stdout__

Complete code:

import sys
from PyQt4 import QtGui, QtCore
import jtextfsm as textfsm


class Stream(QtCore.QObject):
    newText = QtCore.pyqtSignal(str)

    def write(self, text):
        self.newText.emit(str(text))

class Window(QtGui.QMainWindow):
    def __init__(self):
        super(Window, self).__init__()
        self.setGeometry(50, 50, 500, 300)
        self.setWindowTitle("PyQT tuts!")
        self.setWindowIcon(QtGui.QIcon('pythonlogo.png'))
        self.home()

        sys.stdout = Stream(newText=self.onUpdateText)

    def onUpdateText(self, text):
        cursor = self.process.textCursor()
        cursor.movePosition(QtGui.QTextCursor.End)
        cursor.insertText(text)
        self.process.setTextCursor(cursor)
        self.process.ensureCursorVisible()

    def __del__(self):
        sys.stdout = sys.__stdout__

    def home(self):

        w = QtGui.QWidget()
        self.setCentralWidget(w)
        lay = QtGui.QVBoxLayout(w)
        btn = QtGui.QPushButton("Generate")
        btn.clicked.connect(self.TextFSM)

        self.process  = QtGui.QTextEdit()
        self.process.moveCursor(QtGui.QTextCursor.Start)
        self.process.ensureCursorVisible()
        self.process.setLineWrapColumnOrWidth(500)
        self.process.setLineWrapMode(QtGui.QTextEdit.FixedPixelWidth)

        lay.addWidget(btn)
        lay.addWidget(self.process)

        self.show()

    def TextFSM(self):

        nameFile = 'Switch'

        try:
            input_file = open(nameFile + '.txt', encoding='utf-8')  # show version
            raw_text_data = input_file.read()
            input_file.close()

            input_file2 = open(nameFile + '.txt', encoding='utf-8')  # show env
            raw_text_data2 = input_file2.read()
            input_file2.close()

            input_file3 = open(nameFile + '.txt', encoding='utf-8')  # show flash
            raw_text_data3 = input_file3.read()
            input_file3.close()

            input_file4 = open(nameFile + '.txt', encoding='utf-8')  # show memory statistic
            raw_text_data4 = input_file4.read()
            input_file4.close()

            input_file5 = open(nameFile + '.txt', encoding='utf-8')  # show process cpu
            raw_text_data5 = input_file5.read()
            input_file5.close()

            template = open("show-version.textfsm")  # show version
            re_table = textfsm.TextFSM(template)
            fsm_results = re_table.ParseText(raw_text_data)

            template2 = open("show-env.textfsm")  # show env
            re_table2 = textfsm.TextFSM(template2)
            fsm_results2 = re_table2.ParseText(raw_text_data2)

            template3 = open("show-flash.textfsm")  # show flash
            re_table3 = textfsm.TextFSM(template3)
            fsm_results3 = re_table3.ParseText(raw_text_data3)

            template4 = open("show-memory-statistic.textfsm")  # show memory statistic
            re_table4 = textfsm.TextFSM(template4)
            fsm_results4 = re_table4.ParseText(raw_text_data4)

            template5 = open("show-process-cpu.textfsm")  # show process cpu
            re_table5 = textfsm.TextFSM(template5)
            fsm_results5 = re_table5.ParseText(raw_text_data5)

            outfile_name = open(nameFile + "-show-version.csv", "w+")  # show version
            outfile = outfile_name

            outfile_name2 = open(nameFile + "-show-env.csv", "w+")  # show env
            outfile2 = outfile_name2

            outfile_name3 = open(nameFile + "-show-flash.csv", "w+")  # show flash
            outfile3 = outfile_name3

            outfile_name4 = open(nameFile + "-show-memory-statistic.csv", "w+")  # show memory statistic
            outfile4 = outfile_name4

            outfile_name5 = open(nameFile + "-show-process-cpu.csv", "w+")  # show process cpu
            outfile5 = outfile_name5

            print(re_table.header)  # show version
            for s in re_table.header:
                outfile.write("%s;" % s)
            outfile.write("
")

            counter = 0
            for row in fsm_results:  # show version
                print(row)
                for s in row:
                    outfile.write("%s;" % s)
                outfile.write("
")
                counter += 1
            print("Write %d records" % counter)

            print(re_table2.header)  # show env
            for s in re_table2.header:
                outfile2.write("%s;" % s)
            outfile2.write("
")

            counter = 0
            for row in fsm_results2:  # show env
                print(row)
                for s in row:
                    outfile2.write("%s;" % s)
                outfile2.write("
")
                counter += 1
            print("Write %d records" % counter)

            print(re_table3.header)  # show flash
            for s in re_table3.header:
                outfile3.write("%s;" % s)
            outfile3.write("
")

            counter = 0
            for row in fsm_results3:  # show flash
                print(row)
                for s in row:
                    outfile3.write("%s;" % s)
                outfile3.write("
")
                counter += 1
            print("Write %d records" % counter)

            print(re_table4.header)  # show memory statistics
            for s in re_table4.header:
                outfile4.write("%s;" % s)
            outfile4.write("
")

            counter = 0
            for row in fsm_results4:  # show memory statistics
                print(row)
                for s in row:
                    outfile4.write("%s;" % s)
                outfile4.write("
")
                counter += 1
            print("Write %d records" % counter)

            print(re_table5.header)  # show process cpu
            for s in re_table5.header:
                outfile5.write("%s;" % s)
            outfile5.write("
")

            counter = 0
            for row in fsm_results5:  # show process cpu
                print(row)
                for s in row:
                    outfile5.write("%s;" % s)
                outfile5.write("
")
                counter += 1
            print("Write %d records" % counter)
        except IOError:
            print("Error: There Have File does not appear to exist.")
            QtGui.QMessageBox.question(self, 'Warning', "ERROR:Please check you're '.txt' file and TextFSM File.")


def run():
    app = QtGui.QApplication(sys.argv)
    GUI = Window()
    sys.exit(app.exec_())


run()

Screenshot: