如何从 Python 的主模块中获取变量？

Question

I am a Structural Engineer by trade and I am trying to automate the creation of 3D models using scripts.

So far I have created three modules; the GUI module using PyQt4, a main module that controls the signals from the GUI, and an export module which "should" pull the variables from main module and generate a script that can be read by my analysis program.

So far the I can't pull the variables from main module when clicking the export menu in the GUI because variable names are not defined.

If I import the main module into the export module to get the variables, I get errors with the Ui_MainWindow.

I have tried to simplify what I am doing below.

main.py module

import sys
from PyQt4 import QtGui, QtCore
from gui import Ui_MainWindow
from export import newFile

class Main(QtGui.QMainWindow):

    def __init__(self):
    super(Main, self).__init__()
    self.ui = Ui_MainWindow()
    self.ui.setupUi(self)


    self.setName()

    self.ui.actionExport.triggered.connect(self.exportName)

def exportName(self):
    self.exportStaad = newFile().createNewFile()

def setName(self):
    self.ui.tbo_Name.textChanged.connect(self.name_Changed)

def name_Changed(self):
    someName = self.ui.tbo_Name.text()
    print('Name = ' + someName)


app = QtGui.QApplication(sys.argv)
form = Main()
form.show()
app.exec_()

gui.py

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'gui.ui'
#
# Created by: PyQt4 UI code generator 4.11.4
#
# WARNING! All changes made in this file will be lost!

from PyQt4 import QtCore, QtGui

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName(_fromUtf8("MainWindow"))
        MainWindow.resize(800, 600)
        self.centralwidget = QtGui.QWidget(MainWindow)
        self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
        self.tbo_Name = QtGui.QLineEdit(self.centralwidget)
        self.tbo_Name.setGeometry(QtCore.QRect(80, 60, 150, 20))
        self.tbo_Name.setObjectName(_fromUtf8("tbo_Name"))
        self.lab_Name = QtGui.QLabel(self.centralwidget)
        self.lab_Name.setGeometry(QtCore.QRect(30, 60, 40, 20))
        self.lab_Name.setObjectName(_fromUtf8("lab_Name"))
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtGui.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 21))
        self.menubar.setObjectName(_fromUtf8("menubar"))
        self.menuFile = QtGui.QMenu(self.menubar)
        self.menuFile.setObjectName(_fromUtf8("menuFile"))
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtGui.QStatusBar(MainWindow)
        self.statusbar.setObjectName(_fromUtf8("statusbar"))
        MainWindow.setStatusBar(self.statusbar)
        self.actionExport = QtGui.QAction(MainWindow)
        self.actionExport.setObjectName(_fromUtf8("actionExport"))
        self.menuFile.addAction(self.actionExport)
        self.menubar.addAction(self.menuFile.menuAction())

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

    def retranslateUi(self, MainWindow):
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow", None))
        self.lab_Name.setText(_translate("MainWindow", "Name:", None))
        self.menuFile.setTitle(_translate("MainWindow", "File", None))
        self.actionExport.setText(_translate("MainWindow", "Export", None))


if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    MainWindow = QtGui.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

export.py

import sys
from PyQt4 import QtGui, QtCore
from os import path
import math

class newFile():
    def createNewFile(dest):
        '''
        Creates file
        '''

        name = QtGui.QFileDialog.getSaveFileName ()

        f = open(name, 'w')
        f.write('Hello' + someName)


        f.close

Answer 1

The method called createNewFile(dest) inside the class newFile uses undefined var someName at f.write('Hello' + someName) . This causes the error as it is not defined in the class. Define a variable before you use it.