PyQt5 将 QCompleter 添加到现有的 QTextEdit

Question

我目前正在使用 PyQt5 创建 SQL 编辑器和查询向导，但在尝试将 QCompleter 添加到向导中的所有 QPlainTextEdits 时遇到了问题。所有的 UI 都是用 Qt Designer 创建的，并存储在 QStackedWidget 中。

我已阅读将 Designer 中的小部件提升到我的自定义小部件 (TextEdit)，这是一个带有 QCompleter 模型接口的 QTextEdit。

我的问题是，如何将完成模型设置为已创建的对象？有没有办法在完成者设置之后才初始化它？在程序的另一部分，由于功能的原因，我可以在设置后添加小部件，但必须有更好的方法。

任何帮助将不胜感激。下面是我用来设置工作方式的代码。

tab = QtWidgets.QWidget()
horizontalLayout = QtWidgets.QHBoxLayout(tab)

self.completer = QCompleter(self)


self.all_autocomplete_words.extend(sql_words)
self.all_autocomplete_words = pd.Series(
    self.all_autocomplete_words).sort_values().drop_duplicates().tolist()
#print(self.all_autocomplete_words)
completer_model = QStringListModel(self.all_autocomplete_words, self.completer)

self.completer.setModel(completer_model)
self.completer.setModelSorting(QCompleter.CaseInsensitivelySortedModel)
self.completer.setCaseSensitivity(Qt.CaseInsensitive)
self.completer.setWrapAround(False)
# print(self.auto_completion_words)
# print(self.all_autocomplete_words)
self.completingTextEdit = TextEdit(dict_words=self.auto_completion_words,
                                   list_words=self.all_autocomplete_words, parent=tab)
self.completingTextEdit.setCompleter(self.completer)
self.completingTextEdit.setPlaceholderText('SQL Script')
horizontalLayout.addWidget(self.completingTextEdit)

#sql_ws.setPlaceholderText('SQL Script')
self.sql_tab.addTab(tab, key)

编辑：

这是最小示例的基类...

from min_example_fromui import Ui_MainWindow
from PyQt5.QtWidgets import QApplication, QMainWindow, QFileDialog, QTreeWidget, QTreeWidgetItem, QMenu, QAction, \
    QMessageBox, QTreeWidgetItemIterator, QAbstractItemView, QDialog, QShortcut, QGridLayout, QLabel, QLineEdit,\
    QPushButton, QWhatsThis, QCompleter, QTextEdit, QProgressDialog, QTableWidgetItem, QTableView
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtCore import QFile, QStringListModel, Qt, QThread, pyqtSignal, QObject, pyqtSlot, QTimer, QEventLoop
from PyQt5.QtGui import QCursor, QKeySequence, QTextCursor
import pandas as pd

class sqlWindow(QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(sqlWindow, self).__init__(parent)
        self.setupUi(self)
        self.sql_words = [
            'ABORT'

        ]
        self.all_autocomplete_words = []
        self.auto_completion_words = {}
        self.pushButton.clicked.connect(self.add_tab)

    def add_tab(self):
        tab = QtWidgets.QWidget()
        horizontalLayout = QtWidgets.QHBoxLayout(tab)


        self.completer = QCompleter(self)


        self.all_autocomplete_words.extend(self.sql_words)
        self.all_autocomplete_words = pd.Series(
            self.all_autocomplete_words).sort_values().drop_duplicates().tolist()
        #print(self.all_autocomplete_words)



        completer_model = QStringListModel(self.all_autocomplete_words, self.completer)

        self.completer.setModel(completer_model)
        self.completer.setModelSorting(QCompleter.CaseInsensitivelySortedModel)
        self.completer.setCaseSensitivity(Qt.CaseInsensitive)
        self.completer.setWrapAround(False)
        # print(self.auto_completion_words)
        # print(self.all_autocomplete_words)
        self.completingTextEdit = TextEdit(dict_words=self.auto_completion_words,
                                           list_words=self.all_autocomplete_words, parent=tab)
        self.completingTextEdit.setCompleter(self.completer)
        self.completingTextEdit.setPlaceholderText('SQL Script')
        horizontalLayout.addWidget(self.completingTextEdit)

        # sql_ws.setPlaceholderText('SQL Script')
        self.sql_tab.addTab(tab, 'key')
        self.sql_tab.setCurrentWidget(tab)

class TextEdit(QTextEdit):
    def __init__(self, dict_words=dict, list_words=list, parent=None):
        super(TextEdit, self).__init__(parent)

        self._completer = None
        self.auto_complete_dict = dict_words
        self.all_autocomplete = list_words
        #Class Instances
        self.completion_prefix = ''


    def setCompleter(self, c):

        self._completer = c
        c.setWidget(self)
        c.setCompletionMode(QCompleter.PopupCompletion)
        c.setCaseSensitivity(Qt.CaseInsensitive)
        c.activated.connect(self.insertCompletion)


    def insertCompletion(self, completion):
        if self._completer.widget() is not self:
            return

        tc = self.textCursor()
        extra = len(completion) - len(self._completer.completionPrefix())
        tc.movePosition(QTextCursor.Left)
        tc.movePosition(QTextCursor.EndOfWord)

        if self.completion_prefix.lower() == completion[-extra:].lower():
            pass
            #print('You inserted the word after it was completed')
        else:
            tc.insertText(completion[-extra:])
            #print('The text being inserted',completion[-extra:])
            self.setTextCursor(tc)
            self._completer.setModel(QStringListModel(self.all_autocomplete, self._completer))

    def textUnderCursor(self):
        tc = self.textCursor()
        tc.select(QTextCursor.WordUnderCursor)
        #print('Here is the selected text under the cursor' , tc.selectedText())
        return tc.selectedText()

    def focusInEvent(self, e):
        #Open the widget where you are at in the edit
        if self._completer is not None:
            self._completer.setWidget(self)
        super(TextEdit, self).focusInEvent(e)

    def keyPressEvent(self, e):

        isShortcut = False

        if self._completer is not None and self._completer.popup().isVisible():
            #print('Popup is up')
            # The following keys are forwarded by the completer to the widget.
            if e.key() in (Qt.Key_Enter, Qt.Key_Return, Qt.Key_Escape, Qt.Key_Tab, Qt.Key_Backtab):
                e.ignore()
                #self._completer.setModel(QStringListModel(self.all_autocomplete, self._completer))
                # Let the completer do default behavior.
                return

        if e.key() == Qt.Key_E and e.modifiers() == Qt.ControlModifier:
            #Control + E was pressed.
            words = self.all_autocomplete
            self._completer.setModel(QStringListModel(words, self._completer))
            isShortcut = True

        if e.key() == Qt.Key_Period:
            #This is how I will do the lookup functionality. Show when period is his, open the list of options.
            self.textCursor().insertText('.')
            self.moveCursor(QtGui.QTextCursor.PreviousWord)
            self.moveCursor(QtGui.QTextCursor.PreviousWord, QtGui.QTextCursor.KeepAnchor)
            dict_key = self.textCursor().selectedText().upper()
            #print('Dict Key' , dict_key)
            self.moveCursor(QtGui.QTextCursor.NextWord)
            self.moveCursor(QtGui.QTextCursor.NextWord)

            #print(dict_key)
            words = self.auto_complete_dict[dict_key]
            self._completer.setModel(QStringListModel(words, self._completer))
            isShortcut = True

        if self._completer is None or not isShortcut:
            # Do not process the shortcut when we have a completer.
            super(TextEdit, self).keyPressEvent(e)

        ctrlOrShift = e.modifiers() & (Qt.ControlModifier | Qt.ShiftModifier)
        if self._completer is None or (ctrlOrShift and len(e.text()) == 0):
            return

        eow = "~!@#$%^&*()_+{}|:\"<>?,./;'[]\\-="
        hasModifier = (e.modifiers() != Qt.NoModifier) and not ctrlOrShift


        completionPrefix = self.textUnderCursor()
        self.completion_prefix = completionPrefix
        #print('CompletionPrefix :' , completionPrefix)

        if not isShortcut and (hasModifier or len(e.text()) == 0 or len(completionPrefix) < 2 or e.text()[-1] in eow):
            self._completer.popup().hide()
            return

        if completionPrefix != self._completer.completionPrefix():
            #Puts the Prefix of the word youre typing into the Prefix
            self._completer.setCompletionPrefix(completionPrefix)
            self._completer.popup().setCurrentIndex(
                    self._completer.completionModel().index(0, 0))

        cr = self.cursorRect()
        cr.setWidth(self._completer.popup().sizeHintForColumn(0) + self._completer.popup().verticalScrollBar().sizeHint().width())
        self._completer.complete(cr)

if __name__ == "__main__":
    import sys

    '''These excepthook lines are to catch errors when using pyqt5'''
    sys._excepthook = sys.excepthook
    def exception_hook(exctype, value, traceback):
        print(exctype, value, traceback)
        sys._excepthook(exctype, value, traceback)
        sys.exit(1)
    sys.excepthook = exception_hook
    '''Error handling section to raise errors'''

    app = QApplication(sys.argv)
    main_window = sqlWindow()
    main_window.show()
    sys.exit(app.exec_())

这是我的用户界面代码：

from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 600)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.centralwidget)
        self.verticalLayout.setObjectName("verticalLayout")
        self.sql_tab = QtWidgets.QTabWidget(self.centralwidget)
        self.sql_tab.setEnabled(True)
        self.sql_tab.setTabsClosable(True)
        self.sql_tab.setMovable(True)
        self.sql_tab.setObjectName("sql_tab")
        self.tab = QtWidgets.QWidget()
        self.tab.setObjectName("tab")
        self.gridLayout_2 = QtWidgets.QGridLayout(self.tab)
        self.gridLayout_2.setObjectName("gridLayout_2")
        spacerItem = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.gridLayout_2.addItem(spacerItem, 0, 2, 1, 1)
        spacerItem1 = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.gridLayout_2.addItem(spacerItem1, 0, 0, 1, 1)
        self.gridLayout = QtWidgets.QGridLayout()
        self.gridLayout.setObjectName("gridLayout")
        self.label_2 = QtWidgets.QLabel(self.tab)
        self.label_2.setObjectName("label_2")
        self.gridLayout.addWidget(self.label_2, 0, 0, 1, 1)
        self.pushButton = QtWidgets.QPushButton(self.tab)
        self.pushButton.setObjectName("pushButton")
        self.gridLayout.addWidget(self.pushButton, 0, 1, 1, 1)
        self.gridLayout_2.addLayout(self.gridLayout, 1, 1, 1, 1)
        self.label = QtWidgets.QLabel(self.tab)
        self.label.setFrameShape(QtWidgets.QFrame.Box)
        self.label.setLineWidth(0)
        self.label.setAlignment(QtCore.Qt.AlignCenter)
        self.label.setObjectName("label")
        self.gridLayout_2.addWidget(self.label, 0, 1, 1, 1)
        self.sql_tab.addTab(self.tab, "")
        self.verticalLayout.addWidget(self.sql_tab)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 21))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        self.sql_tab.setCurrentIndex(0)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.label_2.setText(_translate("MainWindow", "For Help, refer to the User Manual."))
        self.pushButton.setText(_translate("MainWindow", "User Manual"))
        self.label.setText(_translate("MainWindow", "<html><head/><body><p><span style=\" font-size:18pt;\">SQL Editor Welcome Sheet</span></p><p><br/></p><p>Only List Reports Can be Ran by Worksheet. </p><p>All Other Reports are Ran Through the Query Builder.</p></body></html>"))
        self.sql_tab.setTabText(self.sql_tab.indexOf(self.tab), _translate("MainWindow", "SQL Editor Home"))

谢谢！

第二次编辑：

from min_example_fromui import Ui_MainWindow
from PyQt5.QtWidgets import QApplication, QMainWindow, QFileDialog, QTreeWidget, QTreeWidgetItem, QMenu, QAction, \
    QMessageBox, QTreeWidgetItemIterator, QAbstractItemView, QDialog, QShortcut, QGridLayout, QLabel, QLineEdit,\
    QPushButton, QWhatsThis, QCompleter, QTextEdit, QProgressDialog, QTableWidgetItem, QTableView
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtCore import QFile, QStringListModel, Qt, QThread, pyqtSignal, QObject, pyqtSlot, QTimer, QEventLoop
from PyQt5.QtGui import QCursor, QKeySequence, QTextCursor
import pandas as pd

    class sqlWindow(QMainWindow, Ui_MainWindow):
        def __init__(self, parent=None):
            super(sqlWindow, self).__init__(parent)
            self.setupUi(self)
            self.sql_words = [
                'ABORT'

            ]
            self.all_autocomplete_words = []
            self.auto_completion_words = {}
            self.pushButton.clicked.connect(self.add_tab)

            self.completer = QCompleter(self)

            self.all_autocomplete_words.extend(self.sql_words)
            self.all_autocomplete_words = pd.Series(
                self.all_autocomplete_words).sort_values().drop_duplicates().tolist()
            # print(self.all_autocomplete_words)

            self.completer_model = QStringListModel(self.all_autocomplete_words, self.completer)
            self.completer.setModel(self.completer_model)
            self.completer.setModelSorting(QCompleter.CaseInsensitivelySortedModel)
            self.completer.setCaseSensitivity(Qt.CaseInsensitive)
            self.completer.setWrapAround(False)

            self.my_sqlbox = TextEdit(dict_words=self.auto_completion_words,
                                               list_words=self.all_autocomplete_words, parent=None)
            self.my_sqlbox.setCompleter(self.completer)
            self.my_sqlbox.setPlaceholderText('SQL Script')

        def add_tab(self):
            tab = QtWidgets.QWidget()
            horizontalLayout = QtWidgets.QHBoxLayout(tab)


            self.completingTextEdit = TextEdit(dict_words=self.auto_completion_words,
                                               list_words=self.all_autocomplete_words, parent=tab)
            self.completingTextEdit.setCompleter(self.completer)
            self.completingTextEdit.setPlaceholderText('SQL Script')
            horizontalLayout.addWidget(self.completingTextEdit)

            # sql_ws.setPlaceholderText('SQL Script')
            self.sql_tab.addTab(tab, 'key')
            self.sql_tab.setCurrentWidget(tab)

    class TextEdit(QTextEdit):
        def __init__(self, dict_words=dict, list_words=list, parent=None):
            super(TextEdit, self).__init__(parent)

            self._completer = None
            self.auto_complete_dict = dict_words
            self.all_autocomplete = list_words
            #Class Instances
            self.completion_prefix = ''


        def setCompleter(self, c):

            self._completer = c
            c.setWidget(self)
            c.setCompletionMode(QCompleter.PopupCompletion)
            c.setCaseSensitivity(Qt.CaseInsensitive)
            c.activated.connect(self.insertCompletion)


        def insertCompletion(self, completion):
            if self._completer.widget() is not self:
                return

            tc = self.textCursor()
            extra = len(completion) - len(self._completer.completionPrefix())
            tc.movePosition(QTextCursor.Left)
            tc.movePosition(QTextCursor.EndOfWord)

            if self.completion_prefix.lower() == completion[-extra:].lower():
                pass
                #print('You inserted the word after it was completed')
            else:
                tc.insertText(completion[-extra:])
                #print('The text being inserted',completion[-extra:])
                self.setTextCursor(tc)
                self._completer.setModel(QStringListModel(self.all_autocomplete, self._completer))

        def textUnderCursor(self):
            tc = self.textCursor()
            tc.select(QTextCursor.WordUnderCursor)
            #print('Here is the selected text under the cursor' , tc.selectedText())
            return tc.selectedText()

        def focusInEvent(self, e):
            #Open the widget where you are at in the edit
            if self._completer is not None:
                self._completer.setWidget(self)
            super(TextEdit, self).focusInEvent(e)

        def keyPressEvent(self, e):

            isShortcut = False

            if self._completer is not None and self._completer.popup().isVisible():
                #print('Popup is up')
                # The following keys are forwarded by the completer to the widget.
                if e.key() in (Qt.Key_Enter, Qt.Key_Return, Qt.Key_Escape, Qt.Key_Tab, Qt.Key_Backtab):
                    e.ignore()
                    #self._completer.setModel(QStringListModel(self.all_autocomplete, self._completer))
                    # Let the completer do default behavior.
                    return

            if e.key() == Qt.Key_E and e.modifiers() == Qt.ControlModifier:
                #Control + E was pressed.
                words = self.all_autocomplete
                self._completer.setModel(QStringListModel(words, self._completer))
                isShortcut = True

            if e.key() == Qt.Key_Period:
                #This is how I will do the lookup functionality. Show when period is his, open the list of options.
                self.textCursor().insertText('.')
                self.moveCursor(QtGui.QTextCursor.PreviousWord)
                self.moveCursor(QtGui.QTextCursor.PreviousWord, QtGui.QTextCursor.KeepAnchor)
                dict_key = self.textCursor().selectedText().upper()
                #print('Dict Key' , dict_key)
                self.moveCursor(QtGui.QTextCursor.NextWord)
                self.moveCursor(QtGui.QTextCursor.NextWord)

                #print(dict_key)
                words = self.auto_complete_dict[dict_key]
                self._completer.setModel(QStringListModel(words, self._completer))
                isShortcut = True

            if self._completer is None or not isShortcut:
                # Do not process the shortcut when we have a completer.
                super(TextEdit, self).keyPressEvent(e)

            ctrlOrShift = e.modifiers() & (Qt.ControlModifier | Qt.ShiftModifier)
            if self._completer is None or (ctrlOrShift and len(e.text()) == 0):
                return

            eow = "~!@#$%^&*()_+{}|:\"<>?,./;'[]\\-="
            hasModifier = (e.modifiers() != Qt.NoModifier) and not ctrlOrShift


            completionPrefix = self.textUnderCursor()
            self.completion_prefix = completionPrefix
            #print('CompletionPrefix :' , completionPrefix)

            if not isShortcut and (hasModifier or len(e.text()) == 0 or len(completionPrefix) < 2 or e.text()[-1] in eow):
                self._completer.popup().hide()
                return

            if completionPrefix != self._completer.completionPrefix():
                #Puts the Prefix of the word youre typing into the Prefix
                self._completer.setCompletionPrefix(completionPrefix)
                self._completer.popup().setCurrentIndex(
                        self._completer.completionModel().index(0, 0))

            cr = self.cursorRect()
            cr.setWidth(self._completer.popup().sizeHintForColumn(0) + self._completer.popup().verticalScrollBar().sizeHint().width())
            self._completer.complete(cr)

    if __name__ == "__main__":
        import sys

        '''These excepthook lines are to catch errors when using pyqt5'''
        sys._excepthook = sys.excepthook
        def exception_hook(exctype, value, traceback):
            print(exctype, value, traceback)
            sys._excepthook(exctype, value, traceback)
            sys.exit(1)
        sys.excepthook = exception_hook
        '''Error handling section to raise errors'''

        app = QApplication(sys.argv)
        main_window = sqlWindow()
        main_window.show()
        sys.exit(app.exec_())

来自 ui 的静态 QPlainText

Answer 1

所以对于以后遇到这个问题的人，我尝试在Qt Designer中推广widget。但是，我在尝试为 QCompleter 添加参数时遇到了问题。我最终要做的是在加载时删除 QPlainTextEdit，然后调用一个函数来添加我与 QCompleter 一起创建的新 TextEdit 类。

见下面的代码：

from min_example_fromui import Ui_MainWindow
from PyQt5.QtWidgets import QApplication, QMainWindow, QFileDialog, QTreeWidget, QTreeWidgetItem, QMenu, QAction, \
    QMessageBox, QTreeWidgetItemIterator, QAbstractItemView, QDialog, QShortcut, QGridLayout, QLabel, QLineEdit,\
    QPushButton, QWhatsThis, QCompleter, QTextEdit, QProgressDialog, QTableWidgetItem, QTableView
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtCore import QFile, QStringListModel, Qt, QThread, pyqtSignal, QObject, pyqtSlot, QTimer, QEventLoop
from PyQt5.QtGui import QCursor, QKeySequence, QTextCursor
import pandas as pd

class sqlWindow(QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(sqlWindow, self).__init__(parent)
        self.setupUi(self)
        self.sql_words = [
            'ABORT'
        ]
        self.all_autocomplete_words = []
        self.auto_completion_words = {}

        ##################Delete the existing QPlainTextEdit############
        self.my_sqlbox.deleteLater()


        self.pushButton.clicked.connect(self.add_tab)
        self.pushButton_2.clicked.connect(self.test)
        self.completer = QCompleter(self)

        self.all_autocomplete_words.extend(self.sql_words)
        self.all_autocomplete_words = pd.Series(
            self.all_autocomplete_words).sort_values().drop_duplicates().tolist()
        # print(self.all_autocomplete_words)

        self.completer_model = QStringListModel(self.all_autocomplete_words, self.completer)
        self.completer.setModel(self.completer_model)
        self.completer.setModelSorting(QCompleter.CaseInsensitivelySortedModel)
        self.completer.setCaseSensitivity(Qt.CaseInsensitive)
        self.completer.setWrapAround(False)

        #######RIGHT HERE IS WHERE I CALL THE NEW TextEdit creation#######
        self.makeText()





    def add_tab(self):
        tab = QtWidgets.QWidget()
        horizontalLayout = QtWidgets.QHBoxLayout(tab)


        self.completingTextEdit = TextEdit(dict_words=self.auto_completion_words,
                                           list_words=self.all_autocomplete_words, parent=tab)
        self.completingTextEdit.setCompleter(self.completer)
        self.completingTextEdit.setPlaceholderText('SQL Script')
        horizontalLayout.addWidget(self.completingTextEdit)

        # sql_ws.setPlaceholderText('SQL Script')
        self.sql_tab.addTab(tab, 'key')
        self.sql_tab.setCurrentWidget(tab)

    def makeText(self):
        self.my_sqlbox = TextEdit(dict_words=self.auto_completion_words,
                                  list_words=self.all_autocomplete_words, parent=None)
        self.my_sqlbox.setCompleter(self.completer)
        self.my_sqlbox.setPlaceholderText('SQL Script')
        self.gridLayout_2.addWidget(self.my_sqlbox ,0, 1, 1, 1)

class TextEdit(QTextEdit):
    def __init__(self, dict_words=dict, list_words=list, parent=None):
        super(TextEdit, self).__init__(parent)

        self._completer = None
        self.auto_complete_dict = dict_words
        self.all_autocomplete = list_words
        #Class Instances
        self.completion_prefix = ''


    def setCompleter(self, c):

        self._completer = c
        c.setWidget(self)
        c.setCompletionMode(QCompleter.PopupCompletion)
        c.setCaseSensitivity(Qt.CaseInsensitive)
        c.activated.connect(self.insertCompletion)


    def insertCompletion(self, completion):
        if self._completer.widget() is not self:
            return

        tc = self.textCursor()
        extra = len(completion) - len(self._completer.completionPrefix())
        tc.movePosition(QTextCursor.Left)
        tc.movePosition(QTextCursor.EndOfWord)

        if self.completion_prefix.lower() == completion[-extra:].lower():
            pass
            #print('You inserted the word after it was completed')
        else:
            tc.insertText(completion[-extra:])
            #print('The text being inserted',completion[-extra:])
            self.setTextCursor(tc)
            self._completer.setModel(QStringListModel(self.all_autocomplete, self._completer))

    def textUnderCursor(self):
        tc = self.textCursor()
        tc.select(QTextCursor.WordUnderCursor)
        #print('Here is the selected text under the cursor' , tc.selectedText())
        return tc.selectedText()

    def focusInEvent(self, e):
        #Open the widget where you are at in the edit
        if self._completer is not None:
            self._completer.setWidget(self)
        super(TextEdit, self).focusInEvent(e)

    def keyPressEvent(self, e):

        isShortcut = False

        if self._completer is not None and self._completer.popup().isVisible():
            #print('Popup is up')
            # The following keys are forwarded by the completer to the widget.
            if e.key() in (Qt.Key_Enter, Qt.Key_Return, Qt.Key_Escape, Qt.Key_Tab, Qt.Key_Backtab):
                e.ignore()
                #self._completer.setModel(QStringListModel(self.all_autocomplete, self._completer))
                # Let the completer do default behavior.
                return

        if e.key() == Qt.Key_E and e.modifiers() == Qt.ControlModifier:
            #Control + E was pressed.
            words = self.all_autocomplete
            self._completer.setModel(QStringListModel(words, self._completer))
            isShortcut = True

        if e.key() == Qt.Key_Period:
            #This is how I will do the lookup functionality. Show when period is his, open the list of options.
            self.textCursor().insertText('.')
            self.moveCursor(QtGui.QTextCursor.PreviousWord)
            self.moveCursor(QtGui.QTextCursor.PreviousWord, QtGui.QTextCursor.KeepAnchor)
            dict_key = self.textCursor().selectedText().upper()
            #print('Dict Key' , dict_key)
            self.moveCursor(QtGui.QTextCursor.NextWord)
            self.moveCursor(QtGui.QTextCursor.NextWord)

            #print(dict_key)
            words = self.auto_complete_dict[dict_key]
            self._completer.setModel(QStringListModel(words, self._completer))
            isShortcut = True

        if self._completer is None or not isShortcut:
            # Do not process the shortcut when we have a completer.
            super(TextEdit, self).keyPressEvent(e)

        ctrlOrShift = e.modifiers() & (Qt.ControlModifier | Qt.ShiftModifier)
        if self._completer is None or (ctrlOrShift and len(e.text()) == 0):
            return

        eow = "~!@#$%^&*()_+{}|:\"<>?,./;'[]\\-="
        hasModifier = (e.modifiers() != Qt.NoModifier) and not ctrlOrShift


        completionPrefix = self.textUnderCursor()
        self.completion_prefix = completionPrefix
        #print('CompletionPrefix :' , completionPrefix)

        if not isShortcut and (hasModifier or len(e.text()) == 0 or len(completionPrefix) < 2 or e.text()[-1] in eow):
            self._completer.popup().hide()
            return

        if completionPrefix != self._completer.completionPrefix():
            #Puts the Prefix of the word youre typing into the Prefix
            self._completer.setCompletionPrefix(completionPrefix)
            self._completer.popup().setCurrentIndex(
                    self._completer.completionModel().index(0, 0))

        cr = self.cursorRect()
        cr.setWidth(self._completer.popup().sizeHintForColumn(0) + self._completer.popup().verticalScrollBar().sizeHint().width())
        self._completer.complete(cr)

if __name__ == "__main__":
    import sys

    '''These excepthook lines are to catch errors when using pyqt5'''
    sys._excepthook = sys.excepthook
    def exception_hook(exctype, value, traceback):
        print(exctype, value, traceback)
        sys._excepthook(exctype, value, traceback)
        sys.exit(1)
    sys.excepthook = exception_hook
    '''Error handling section to raise errors'''

    app = QApplication(sys.argv)
    main_window = sqlWindow()
    main_window.show()
    sys.exit(app.exec_())