Python 2.7.8 TypeError：“unicode”对象不可调用

Question

我正在运行 python 版本 2.7.8。我将项目标题存储在我试图导入组合框的 sqlite 数据库中。当我尝试从 sqlite 数据库导入项目标题并将它们导入组合框时，我收到此错误：TypeError: 'unicode' object is not callable

这是我的代码：

main.py

from EvDB import EvDB
import wx
from ProjectsPanel import ProjectsPanel

class MyFrame(wx.Frame):
    """ We simply derive a new class of Frame. """
    def __init__(self, parent, ID, title):
        wx.Frame.__init__(self, parent, ID, title=title, size=(650,725))

        # Create Database Tables
        self.db = EvDB(self)
        self.db.createTbls()

        main = wx.Panel(self)

        self.projectsPg = ProjectsPanel(main, -1)

        self.mainSizer = wx.BoxSizer(wx.VERTICAL)

        self.mainSizer.Add(self.projectsPg, 1, wx.ALL|wx.EXPAND)


        main.SetAutoLayout(True)
        main.SetSizer(self.mainSizer)
        self.mainSizer.Fit(main)
        self.Layout()
        self.Show()

        self.UserID = 1
        rows = self.db.getProjects(self.UserID)

        print(rows)
        print(str(rows))

        self.projectsPg.cb.Value(rows)

app = wx.App(False)

ProjectsPanel.py

import wx
from EvDB import EvDB
import sqlite3 as lite

class ProjectsPanel(wx.Panel):
    def __init__(self, parent, ID):
        wx.Panel.__init__(self, parent, ID)

        self.db = lite.connect('evDB.db')
        self.cur = self.db.cursor()
        self.db2 = EvDB(self)

        sizer = wx.BoxSizer(wx.VERTICAL)

        # the combobox Control
        self.userProjects = ['Before1','Before2', 'Before3', 'Before4']
        self.cb = wx.ComboBox(self, value='New', choices=self.userProjects, style=wx.CB_DROPDOWN)

        sizer.Add(self.cb, 0, wx.EXPAND)

        # Setting Layouts
        self.SetAutoLayout(True)
        self.SetSizer(sizer)
        sizer.Fit(self)

EvDB.py

import sqlite3 as lite

class EvDB():
    def __init__(self, parent):
        self.db = lite.connect('evDB.db')
        self.cur = self.db.cursor()

    def createTbls(self):

        self.db.execute('''CREATE TABLE IF NOT EXISTS Projects
                        (ID INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
                        Title varchar(50) DEFAULT NULL,
                        DateCreated DATE);''')

        self.db.execute('''CREATE TABLE IF NOT EXISTS User_x_Project
                        (ID INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
                        UserID INT DEFAULT NULL,
                        ProjectID INT DEFAULT NULL);''')


    def getProjects(self,userID):
        self.cur.execute("SELECT Title FROM User_x_Project, Projects WHERE User_x_Project.UserID = "+str(userID)+" AND User_x_Project.ProjectID = Projects.ID;")
        rows = self.cur.fetchall()

        return rows

打印结果：[(u'Tests',), (u'Test1',), (u'Test2',), (u'Test3',)]

如何将存储在我的 sqlite 数据库中的标题添加到我的组合框？

感谢您的所有帮助！

编辑：这是我的全部回溯

C:\Python27\python.exe C:/Users/xxx/xxx/xxx/main.py
[(u'Tests',), (u'Test1',), (u'Test2',), (u'Test3',)]
[(u'Tests',), (u'Test1',), (u'Test2',), (u'Test3',)]
Traceback (most recent call last):
  File "C:/Users/xxx/xxx/xxx/main.py", line 43, in <module>
    frame = MyFrame(None, -1, 'Small editor')
  File "C:/Users/xxx/xxx/xxx/main.py", line 37, in __init__
    self.projectsPg.cb.Value(rows)
TypeError: 'unicode' object is not callable

Process finished with exit code 1

Answer 1

self.projectsPg.cb 是一个 ComboBox 对象，Value 是一个属性。如果您在没有赋值的情况下访问该属性，它将返回一个字符串（或 unicode）。你不能叫它。

如果要为组合框设置值，请使用属性赋值 (ComboBox.Value =) 或 ComboxBox.SetValue：

除此之外，Cursor.fetchall 返回的rows 是一个元组列表。您需要获取第一个。 （在下面的例子中，为了简洁，我省略了返回行计数检查）

self.projectsPg.cb.Value = rows[0][0]

# OR

self.projectsPg.cb.SetValue(rows[0][0])