import sys
from PyQt5 import QtCore
from PyQt5.QtWidgets import (QApplication, QPushButton, QMainWindow,  QLabel, QDesktopWidget, QListWidget)
from PyQt5.QtGui import QFont
import logic
class Program(QMainWindow):
    def __init__(self):
        super().__init__()
        self.initUI()
    def initUI(self):
        self.first_list = QListWidget(self)
        self.first_list.setGeometry(15, 35, 140, 42)
        add_to_list_button = QPushButton('Add', self)
        add_to_list_button.setGeometry(165, 35, 30, 20)
        add_to_list_button.clicked.connect(lambda: logic.addToList(self))
        self.second_list = QListWidget(self)
        self.second_list.setGeometry(205, 35, 140, 192)
        for i in range(30):
            self.second_list.addItem(logic.list_one[i][3])
if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Program()
    sys.exit(app.exec_())

 import gui
# list_one and list_two go here
prog = gui.Program()
def addToList(self):
    for i in range(len(prog.second_list)):
        if list_one[i][3] == str(prog.second_list.currentItem().text()):
            index = i
    list_two.append(list_one[index])

 import logic

 prog = gui.Program()