如何在python中正确连接两个函数？

在我的小程序中，我无法将两个函数相互连接。 我正在使用PyQt5和PyPDF2模块。我想把两个pdf文件链接成一个。 在我的程序中，我有3个按钮：

• btnPlik1-浏览第一个文件（连接到函数openFile1）
• btnPlik2-浏览第二个文件（连接到函数openFile2）
• btnPlik3-“启动”-运行程序（连接到函数laczeniePdf）

函数单独工作，但当我想通过单击“开始”（btnPlik3）连接它们时，我的程序崩溃。下面是我的代码：

def openFile1(self):
    pathFileName, _ = QtWidgets.QFileDialog.getOpenFileName(None, 'Wybierz plik', '', 'pdf(*.pdf)')
    print("PathFileName-'{}', \n_-'{}'".format(pathFileName, _))
    if pathFileName:
        print("Wybrany plik: ", pathFileName)
        g = open(pathFileName, 'rb')
        return g

def openFile2(self):
    pathFileName, _ = QtWidgets.QFileDialog.getOpenFileName(None, 'Wybierz plik', '', 'pdf(*.pdf)')
    print("PathFileName-'{}', \n_-'{}'".format(pathFileName, _))
    if pathFileName:
        print("Wybrany plik: ", pathFileName)
        h = open(pathFileName, 'rb')
        return h

def laczeniePdf(self,g, h):
    readerLinkPage1 = PyPDF2.PdfFileReader(open(g, 'rb'))
    readerLinkPage2 = PyPDF2.PdfFileReader(open(h, 'rb'))
    writerLinkPage = PyPDF2.PdfFileWriter()

    OutputFile = open('FinalOutput.pdf', 'wb')
    writerLinkPage.appendPagesFromReader(readerLinkPage1)
    writerLinkPage.appendPagesFromReader(readerLinkPage2)
    writerLinkPage.write(OutputFile)
    OutputFile.close()

我期待着您的提示和建议

编辑：

试试看：

import sys
from   PyQt5 import QtCore, QtGui, QtWidgets
import PyPDF2

class Ui_PolaczPliki(object):
    def __init__(self):                     # +++
        self.file_1 = None                  # +++
        self.file_2 = None                  # +++

    def setupUi(self, PolaczPliki):
        PolaczPliki.setObjectName("PolaczPliki")
        PolaczPliki.resize(600, 150)

        self.btnPlik1 = QtWidgets.QPushButton(PolaczPliki)
        self.btnPlik1.setGeometry(QtCore.QRect(30, 40, 91, 41))
        self.btnPlik1.setObjectName("btnPlik1")
        self.btnPlik1.clicked.connect(self.openFile1)

        self.btnPlik2 = QtWidgets.QPushButton(PolaczPliki)
        self.btnPlik2.setGeometry(QtCore.QRect(300, 40, 91, 41))
        self.btnPlik2.setObjectName("btnPlik2")
        self.btnPlik2.clicked.connect(self.openFile2)

        self.btnPlik3 = QtWidgets.QPushButton(PolaczPliki)
        self.btnPlik3.setGeometry(QtCore.QRect(165, 90, 91, 41))
        self.btnPlik3.setObjectName("btnPlik3")

        self.btnPlik3.clicked.connect(lambda: self.laczeniePdf(self.file_1, self.file_2)) # +++

        self.label = QtWidgets.QLabel(PolaczPliki)
        self.label.setGeometry(QtCore.QRect(30, 10, 47, 13))
        self.label.setObjectName("label")

        self.label_2 = QtWidgets.QLabel(PolaczPliki)
        self.label_2.setGeometry(QtCore.QRect(300, 10, 47, 13))
        self.label_2.setObjectName("label_2")

        self.retranslateUi(PolaczPliki)
        QtCore.QMetaObject.connectSlotsByName(PolaczPliki)

    def retranslateUi(self, PolaczPliki):
        _translate = QtCore.QCoreApplication.translate
        PolaczPliki.setWindowTitle(_translate("PolaczPliki", "Polacz pliki"))
        self.btnPlik1.setText(_translate("PolaczPliki", "Dodaj Plik nr 1"))
        self.btnPlik2.setText(_translate("PolaczPliki", "Dodaj Plik nr 2"))
        self.btnPlik3.setText(_translate("PolaczPliki", "Start"))
        self.label.setText(_translate("PolaczPliki", "Plik nr 1"))
        self.label_2.setText(_translate("PolaczPliki", "Plik nr 2"))

    def openFile1(self):
        pathFileName, _ = QtWidgets.QFileDialog.getOpenFileName(None, 'Wybierz plik', '', 'pdf(*.pdf)')
        print("PathFileName-'{}', \n_-'{}'".format(pathFileName, _))
        if pathFileName:
            print("\nWybrany plik: ", pathFileName)
            self.file_1 = pathFileName                        # +++
            self.label.setText("{}".format(self.file_1))      # +++
            self.label.adjustSize()                           # +++
            #g = open(pathFileName, 'rb')
            #print("\ng = open(pathFileName, 'rb') =`{}`, \ntype g =`{}` ".format(g, type(g)))
            #return g

    def openFile2(self):
        pathFileName, _ = QtWidgets.QFileDialog.getOpenFileName(None, 'Wybierz plik', '', 'pdf(*.pdf)')
        print("PathFileName-'{}', \n_-'{}'".format(pathFileName, _))
        if pathFileName:
            print("\nWybrany plik: ", pathFileName)
            self.file_2 = pathFileName                        # +++
            self.label_2.setText("{}".format(self.file_2))    # +++ 
            self.label_2.adjustSize()                         # +++
            #h = open(pathFileName, 'rb')
            #print("\nh = open(pathFileName, 'rb') =`{}`, \ntype h =`{}` ".format(h, type(h)))
            #return h

    def laczeniePdf(self, file_1, file_2):                    # +++
        g = open(file_1, 'rb')                                # +++
        h = open(file_2, 'rb')                                # +++
        readerLinkPage1 = PyPDF2.PdfFileReader(g)
        readerLinkPage2 = PyPDF2.PdfFileReader(h)
        writerLinkPage  = PyPDF2.PdfFileWriter()

        OutputFile = open('FinalOutput.pdf', 'wb')
        writerLinkPage.appendPagesFromReader(readerLinkPage1)
        writerLinkPage.appendPagesFromReader(readerLinkPage2)
        writerLinkPage.write(OutputFile)
        OutputFile.close() 
        print("\n g=`{}`  +  h=`{}` !!!".format(file_1, file_2))        


if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    ex = Ui_PolaczPliki()                    #Ui_MainWindow()  # +++
    w = QtWidgets.QMainWindow()
    ex.setupUi(w)
    w.show()
    sys.exit(app.exec_())

---

。。。撞车。。。。用什么信息？Stacktrace？您还没有向我们展示调用此

laczeniePdf

的代码，或者它为

g

和

h

传递的参数。但是作为猜测，它可能传递了从

openFile1

和

openFile2

返回的值，这两个对象都是打开的文件对象。然后你要做的第一件事就是调用

open（g，'rb'）

，这是非常可疑的。另外，你的另外两个函数使用了

self

参数，这意味着它们是你没有向我们展示的某个类的方法，但是你的

laczeniePdf

没有使用

self

参数，这意味着，假设您以合理的方式调用它，

f

将是

self

实例，而不是您所期望的

f

，并且

g

和

h

可能会从您所期望的位置偏移一位。

laczeniePdf

通过单击按钮调用：

self.btnPlik3.clicked.connect（self.laczeniePdf）

谢谢，它正在工作。现在我正试图了解您的变化并了解它们：）

import sys
from   PyQt5 import QtCore, QtGui, QtWidgets
import PyPDF2

class Ui_PolaczPliki(object):
    def __init__(self):                     # +++
        self.file_1 = None                  # +++
        self.file_2 = None                  # +++

    def setupUi(self, PolaczPliki):
        PolaczPliki.setObjectName("PolaczPliki")
        PolaczPliki.resize(600, 150)

        self.btnPlik1 = QtWidgets.QPushButton(PolaczPliki)
        self.btnPlik1.setGeometry(QtCore.QRect(30, 40, 91, 41))
        self.btnPlik1.setObjectName("btnPlik1")
        self.btnPlik1.clicked.connect(self.openFile1)

        self.btnPlik2 = QtWidgets.QPushButton(PolaczPliki)
        self.btnPlik2.setGeometry(QtCore.QRect(300, 40, 91, 41))
        self.btnPlik2.setObjectName("btnPlik2")
        self.btnPlik2.clicked.connect(self.openFile2)

        self.btnPlik3 = QtWidgets.QPushButton(PolaczPliki)
        self.btnPlik3.setGeometry(QtCore.QRect(165, 90, 91, 41))
        self.btnPlik3.setObjectName("btnPlik3")

        self.btnPlik3.clicked.connect(lambda: self.laczeniePdf(self.file_1, self.file_2)) # +++

        self.label = QtWidgets.QLabel(PolaczPliki)
        self.label.setGeometry(QtCore.QRect(30, 10, 47, 13))
        self.label.setObjectName("label")

        self.label_2 = QtWidgets.QLabel(PolaczPliki)
        self.label_2.setGeometry(QtCore.QRect(300, 10, 47, 13))
        self.label_2.setObjectName("label_2")

        self.retranslateUi(PolaczPliki)
        QtCore.QMetaObject.connectSlotsByName(PolaczPliki)

    def retranslateUi(self, PolaczPliki):
        _translate = QtCore.QCoreApplication.translate
        PolaczPliki.setWindowTitle(_translate("PolaczPliki", "Polacz pliki"))
        self.btnPlik1.setText(_translate("PolaczPliki", "Dodaj Plik nr 1"))
        self.btnPlik2.setText(_translate("PolaczPliki", "Dodaj Plik nr 2"))
        self.btnPlik3.setText(_translate("PolaczPliki", "Start"))
        self.label.setText(_translate("PolaczPliki", "Plik nr 1"))
        self.label_2.setText(_translate("PolaczPliki", "Plik nr 2"))

    def openFile1(self):
        pathFileName, _ = QtWidgets.QFileDialog.getOpenFileName(None, 'Wybierz plik', '', 'pdf(*.pdf)')
        print("PathFileName-'{}', \n_-'{}'".format(pathFileName, _))
        if pathFileName:
            print("\nWybrany plik: ", pathFileName)
            self.file_1 = pathFileName                        # +++
            self.label.setText("{}".format(self.file_1))      # +++
            self.label.adjustSize()                           # +++
            #g = open(pathFileName, 'rb')
            #print("\ng = open(pathFileName, 'rb') =`{}`, \ntype g =`{}` ".format(g, type(g)))
            #return g

    def openFile2(self):
        pathFileName, _ = QtWidgets.QFileDialog.getOpenFileName(None, 'Wybierz plik', '', 'pdf(*.pdf)')
        print("PathFileName-'{}', \n_-'{}'".format(pathFileName, _))
        if pathFileName:
            print("\nWybrany plik: ", pathFileName)
            self.file_2 = pathFileName                        # +++
            self.label_2.setText("{}".format(self.file_2))    # +++ 
            self.label_2.adjustSize()                         # +++
            #h = open(pathFileName, 'rb')
            #print("\nh = open(pathFileName, 'rb') =`{}`, \ntype h =`{}` ".format(h, type(h)))
            #return h

    def laczeniePdf(self, file_1, file_2):                    # +++
        g = open(file_1, 'rb')                                # +++
        h = open(file_2, 'rb')                                # +++
        readerLinkPage1 = PyPDF2.PdfFileReader(g)
        readerLinkPage2 = PyPDF2.PdfFileReader(h)
        writerLinkPage  = PyPDF2.PdfFileWriter()

        OutputFile = open('FinalOutput.pdf', 'wb')
        writerLinkPage.appendPagesFromReader(readerLinkPage1)
        writerLinkPage.appendPagesFromReader(readerLinkPage2)
        writerLinkPage.write(OutputFile)
        OutputFile.close() 
        print("\n g=`{}`  +  h=`{}` !!!".format(file_1, file_2))        


if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    ex = Ui_PolaczPliki()                    #Ui_MainWindow()  # +++
    w = QtWidgets.QMainWindow()
    ex.setupUi(w)
    w.show()
    sys.exit(app.exec_())