eric6/PipInterface/PipDialog.py

Tue, 09 Feb 2021 17:51:16 +0100

author
Detlev Offenbach <detlev@die-offenbachs.de>
date
Tue, 09 Feb 2021 17:51:16 +0100
changeset 8090
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parent 7923
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child 8043
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child 8143
2c730d5fd177
permissions
-rw-r--r--

pip Interface
- extended the Package Details dialog to include buttons to install, upgrade or uninstall the package

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1 # -*- coding: utf-8 -*-
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2
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3 # Copyright (c) 2015 - 2021 Detlev Offenbach <detlev@die-offenbachs.de>
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4 #
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5
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6 """
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7 Module implementing a dialog showing the output of a pip command.
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8 """
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9
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10 from PyQt5.QtCore import (
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11 pyqtSlot, Qt, QCoreApplication, QTimer, QProcess
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12 )
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13 from PyQt5.QtWidgets import QDialog, QDialogButtonBox, QAbstractButton
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14
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15 from E5Gui import E5MessageBox
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16
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17 from .Ui_PipDialog import Ui_PipDialog
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18
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19 import Preferences
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20
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21
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22 class PipDialog(QDialog, Ui_PipDialog):
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23 """
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24 Class implementing a dialog showing the output of a 'python -m pip'
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25 command.
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26 """
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27 def __init__(self, text, parent=None):
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28 """
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29 Constructor
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30
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31 @param text text to be shown by the label
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32 @type str
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33 @param parent reference to the parent widget
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34 @type QWidget
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35 """
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36 super(PipDialog, self).__init__(parent)
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37 self.setupUi(self)
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38
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39 self.buttonBox.button(QDialogButtonBox.Close).setEnabled(False)
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40 self.buttonBox.button(QDialogButtonBox.Cancel).setDefault(True)
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41
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42 self.proc = None
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43 self.__processQueue = []
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44 self.__ioEncoding = Preferences.getSystem("IOEncoding")
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45
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46 self.outputGroup.setTitle(text)
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47
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48 self.show()
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49 QCoreApplication.processEvents()
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50
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51 def closeEvent(self, e):
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52 """
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53 Protected slot implementing a close event handler.
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54
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55 @param e close event
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56 @type QCloseEvent
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57 """
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58 self.__cancel()
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59 e.accept()
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60
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61 def __finish(self):
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62 """
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63 Private slot called when the process finished or the user pressed
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64 the button.
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65 """
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66 if (
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67 self.proc is not None and
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68 self.proc.state() != QProcess.NotRunning
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69 ):
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70 self.proc.terminate()
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71 QTimer.singleShot(2000, self.proc.kill)
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72 self.proc.waitForFinished(3000)
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73
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74 self.proc = None
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75
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76 if self.__processQueue:
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77 cmd, args = self.__processQueue.pop(0)
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78 self.__addOutput("\n\n")
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79 self.startProcess(cmd, args)
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80 else:
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81 self.buttonBox.button(QDialogButtonBox.Close).setEnabled(True)
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82 self.buttonBox.button(QDialogButtonBox.Cancel).setEnabled(False)
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83 self.buttonBox.button(QDialogButtonBox.Close).setDefault(True)
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84 self.buttonBox.button(QDialogButtonBox.Close).setFocus(
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85 Qt.OtherFocusReason)
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86
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87 def __cancel(self):
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88 """
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89 Private slot to cancel the current action.
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90 """
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91 self.__processQueue = []
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92 self.__finish()
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93
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94 @pyqtSlot(QAbstractButton)
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95 def on_buttonBox_clicked(self, button):
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96 """
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97 Private slot called by a button of the button box clicked.
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98
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99 @param button button that was clicked
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100 @type QAbstractButton
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101 """
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102 if button == self.buttonBox.button(QDialogButtonBox.Close):
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103 self.close()
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104 elif button == self.buttonBox.button(QDialogButtonBox.Cancel):
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105 self.__cancel()
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106
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107 def __procFinished(self, exitCode, exitStatus):
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108 """
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109 Private slot connected to the finished signal.
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110
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111 @param exitCode exit code of the process
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112 @type int
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113 @param exitStatus exit status of the process
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114 @type QProcess.ExitStatus
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115 """
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116 self.__finish()
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117
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118 def startProcess(self, cmd, args, showArgs=True):
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119 """
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120 Public slot used to start the process.
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121
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122 @param cmd name of the pip executable to be used
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123 @type str
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124 @param args list of arguments for the process
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125 @type list of str
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126 @param showArgs flag indicating to show the arguments
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127 @type bool
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128 @return flag indicating a successful start of the process
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129 @rtype bool
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130 """
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131 if len(self.errors.toPlainText()) == 0:
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132 self.errorGroup.hide()
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133
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134 if showArgs:
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135 self.resultbox.append(cmd + ' ' + ' '.join(args))
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136 self.resultbox.append('')
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137
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138 self.proc = QProcess()
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139 self.proc.finished.connect(self.__procFinished)
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140 self.proc.readyReadStandardOutput.connect(self.__readStdout)
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141 self.proc.readyReadStandardError.connect(self.__readStderr)
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142 self.proc.start(cmd, args)
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143 procStarted = self.proc.waitForStarted(5000)
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144 if not procStarted:
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145 self.buttonBox.setFocus()
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146 E5MessageBox.critical(
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147 self,
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148 self.tr('Process Generation Error'),
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149 self.tr(
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150 'The process {0} could not be started.'
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151 ).format(cmd))
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152 return procStarted
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153
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154 def startProcesses(self, processParams):
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155 """
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156 Public method to issue a list of commands to be executed.
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157
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158 @param processParams list of tuples containing the command
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159 and arguments
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160 @type list of tuples of (str, list of str)
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161 @return flag indicating a successful start of the first process
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162 @rtype bool
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163 """
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164 if len(processParams) > 1:
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165 for cmd, args in processParams[1:]:
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166 self.__processQueue.append((cmd, args[:]))
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167 cmd, args = processParams[0]
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168 return self.startProcess(cmd, args)
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169
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170 def __readStdout(self):
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171 """
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172 Private slot to handle the readyReadStandardOutput signal.
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173
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174 It reads the output of the process, formats it and inserts it into
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175 the contents pane.
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176 """
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177 if self.proc is not None:
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178 txt = str(self.proc.readAllStandardOutput(),
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179 self.__ioEncoding, 'replace')
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180 self.__addOutput(txt)
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181
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182 def __addOutput(self, txt):
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183 """
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184 Private method to add some text to the output pane.
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185
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186 @param txt text to be added
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187 @type str
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188 """
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189 self.resultbox.insertPlainText(txt)
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190 self.resultbox.ensureCursorVisible()
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191 QCoreApplication.processEvents()
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192
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193 def __readStderr(self):
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194 """
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195 Private slot to handle the readyReadStandardError signal.
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196
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197 It reads the error output of the process and inserts it into the
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198 error pane.
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199 """
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200 if self.proc is not None:
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201 s = str(self.proc.readAllStandardError(),
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202 self.__ioEncoding, 'replace')
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203 self.errorGroup.show()
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204 self.errors.insertPlainText(s)
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205 self.errors.ensureCursorVisible()
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206
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207 QCoreApplication.processEvents()

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