qgis plugin using python

Question

I'm trying to code a qgis plugin using the latest version of python and qgis 2.18 but I keep getting this error message:

AttributeError: AutomatisationDEPLOIEMENT instance has no attribute 'utilisat_lineEdit'

This is my code would anyone kindly help me?

class AutomatisationDEPLOIEMENT:
    """QGIS Plugin Implementation."""

    def __init__(self, iface):
        """Constructor.

        :param iface: An interface instance that will be passed to this class
            which provides the hook by which you can manipulate the QGIS
            application at run time.
        :type iface: QgisInterface
        """
        # Save reference to the QGIS interface
        self.iface = iface
        # initialize plugin directory
        self.plugin_dir = os.path.dirname(__file__)
        # initialize locale
        locale = QSettings().value('locale/userLocale')[0:2]
        locale_path = os.path.join(
            self.plugin_dir,
            'i18n',
            'AutomatisationDEPLOIEMENT_{}.qm'.format(locale))

        if os.path.exists(locale_path):
            self.translator = QTranslator()
            self.translator.load(locale_path)

            if qVersion() > '4.3.3':
                QCoreApplication.installTranslator(self.translator)


        # Declare instance attributes
        self.actions = []
        self.menu = self.tr(u'&Automatisation DEPLOIEMENT')
        # TODO: We are going to let the user set this up in a future iteration
        self.toolbar = self.iface.addToolBar(u'AutomatisationDEPLOIEMENT')
        self.toolbar.setObjectName(u'AutomatisationDEPLOIEMENT')

... snip ...

def loginCheck(self):
    username = self.utilisat_lineEdit.text()
    password = self.pass_lineEdit.text()

    connection = sqlite3.connect("login.db")
    result = connection.execute("SELECT * FROM USERS WHERE USERNAME = ? AND PASSWORD = ?", (username, password))
    if (len(result.fetchall()) > 0):
        print("User Found ! ")
    else:
        print("User Not Found !")
        self.showMessageBox('Warning', 'Invalid Username And Password')
    connection.close()

I'm trying to get the logincheck function to work

Answer 1

The error message clearly shows what you did wrong: AttributeError: AutomatisationDEPLOIEMENT instance has no attribute 'utilisat_lineEdit'

In the first line of your loginCheck() you are trying to access self.utilisat_lineEdit but this property does not exist. I guess your are trying to access some kind of gui element, but this is not available in your class.