来自 PyQt4.QtGui: NameError: name 'QtGui' is not defined答案

【问题标题】：from PyQt4.QtGui: NameError: name 'QtGui' is not defined来自 PyQt4.QtGui: NameError: name 'QtGui' is not defined
【发布时间】：2018-09-11 12:00:53
【问题描述】：

我遵循了具体的导入方式，而不是写 *.
from PyQt4.QtGui

我还缺少什么？

import sys

from PyQt4.QtGui import QMainWindow, QSizePolicy, QWidget, QVBoxLayout, QAction,\
        QKeySequence, QLabel, QItemSelectionModel, QMessageBox, QFileDialog, QFrame, \
        QDockWidget, QProgressBar, QProgressDialog

from PyQt4.QtCore import SIGNAL, QSettings, QSize, QPoint, QVariant, QFileInfo, QTimer, pyqtSignal, QObject


class Window(QtGui.QMainWindow):

    def __init__(self, parent=None):
        QtGui.QGraphicsView.__init__(self, parent)
        self.scene = QtGui.QGraphicsScene(self)
        self.scene.setBackgroundBrush(QtGui.QBrush(QtCore.Qt.darkGray, QtCore.Qt.SolidPattern))
        self.setScene(self.scene)

        self.setDragMode(QtGui.QGraphicsView.ScrollHandDrag)
        self.setTransformationAnchor(QtGui.QGraphicsView.AnchorUnderMouse)
        self.viewport().setCursor(QtCore.Qt.CrossCursor)
        self.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
        self.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)

        self._pan = False
        self._draw = False
        self._moved = False
        self._sel = False
        self.pen = None
        self.penid = None
        self.cmap = None
        self.penwidth = 4
        self._redoStack = []
        self._histStates = []
        self._baseRects = [] 

app = QtGui.QApplication(sys.argv)
GUI = Window()
sys.exit(app.exec_())

【问题讨论】：

您将其导入为PyQt4.QtGui。
那么，应该写什么呢？ @Aran-Fey
导入没问题，但是你必须使用PyQt4.QtGui而不是QtGui来引用它。
@Aran-Fey 我试过class Window(PyQt4.QtGui.QMainWindow):。结果是NameError: name 'PyQt4' is not defined
只需添加行 from PyQt4 import QtGui 到您的代码中，不要更改任何其他内容

标签： python qt4

【解决方案1】：

我添加了following lines to the code 并解决了错误：

from PyQt4 import QtGui
from PyQt4 import QtCore

现在看起来像这样：

import sys

from PyQt4 import QtGui
from PyQt4 import QtCore

from PyQt4.QtGui import QMainWindow, QSizePolicy, QWidget, QVBoxLayout, QAction,\
        QKeySequence, QLabel, QItemSelectionModel, QMessageBox, QFileDialog, QFrame, \
        QDockWidget, QProgressBar, QProgressDialog

from PyQt4.QtCore import SIGNAL, QSettings, QSize, QPoint, QVariant, QFileInfo, QTimer, pyqtSignal, QObject

【讨论】：