In this tutorial, we are going to learn how to use the QCompleter class to implement autocomplete feature using PyQt5 in Python.

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Source Code:

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout, QTextEdit, QLineEdit, QCompleter
from PyQt5.QtGui import QStandardItem, QStandardItemModel, QFont

class AppDemo(QWidget):
    def __init__(self):
        super().__init__()
        self.resize(1200, 800)

        fnt = QFont('Open Sans', 12)

        mainLayout = QVBoxLayout()

        # input field
        self.input = QLineEdit()
        self.input.setFixedHeight(50)
        self.input.setFont(fnt)
        self.input.editingFinished.connect(self.addEntry)
        mainLayout.addWidget(self.input)

        self.model = QStandardItemModel()
        completer = QCompleter(self.model, self)
        self.input.setCompleter(completer)

        self.console = QTextEdit()
        self.console.setFont(fnt)
        mainLayout.addWidget(self.console)

        self.setLayout(mainLayout)

    def addEntry(self):
        entryItem = self.input.text()
        self.input.clear()
        self.console.append(entryItem)

        if not self.model.findItems(entryItem):
            self.model.appendRow(QStandardItem(entryItem))


app = QApplication(sys.argv)
demo = AppDemo()
demo.show()
sys.exit(app.exec_())