from tkinter import *
import os, sqlite3
root=Tk()
.
.
.
def Chtenie():
        sqlites_db=[]
        for filename in os.listdir(os.getcwd()):
                try:
                        res=sqlite3.connect(filename).cursor().execute('SELECT * from sqlite_master')
                        sqlites_db.append(filename)
                except sqlite3.DatabaseError:
                        pass
        return sqlites_db
def interfaceGrid():
        sbar=Scrollbar(root)
        list=Listbox(root, relief=SUNKEN, bd=2, height=10)
        sbar.config(command=list.yview)
        list.config(yscrollcommand=sbar.set)
        list.grid(row=1, rowspan=3, column=0, padx=0, pady=10)
        sbar.grid(row=1, rowspan=3, column=1, sticky=NS, pady=10)
        pos=0
        optionsBG=Chtenie()
        for label in optionsBG:
                list.insert(pos, label)
                pos+=1
        list.config(selectmode=SINGLE, setgrid=1)
        list.bind('<Double-1>', handleList)
        Label(root).grid(row=1, column=0)
        konnekt=Button(root, text='Connect',width=10)
        konnekt.grid(row=1, column=2, padx=10, pady=10)
        konnekt.bind('<Button-1>', handleList)
       .
       .
       .
        root.listbox=list
            
def handleList(event):
        index=root.listbox.curselection()
        label=root.listbox.get(index)
        runCommand(root, label)
def runCommand(root, selection):
	print('You selected:', selection)
if __name__=='__main__':
	interfaceGrid()
	mainloop()

import os, sqlite3
sqlites_db=[]
for filename in os.listdir(os.getcwdu()):
    try:
        res=sqlite3.connect(filename).cursor().execute('SELECT * from sqlite_master')
        sqlites_db.append(filename)
    except sqlite3.DatabaseError:
        pass
print sqlites_db