python - 创建虚拟环境时，传递给 venv.create() 的参数无效
问题描述
我正在使用 PyQt5 向导来创建 Python 虚拟环境。创建环境有效。参数（例如，带或不带pip，...）从 a 传递到Python 附带的模块QCheckBox()的create()函数。venv
问题是传递的参数venv.create()对虚拟环境的创建没有影响。它始终使用默认设置创建（例如，pip默认安装）。
但是如果我with_pip=False直接通过，pip就不会安装。这意味着，由于某种原因，传递的参数args对创建没有影响。我尝试将值转换为bool()，但这没有用。
我不清楚为什么，因为print(args)输出True或False（作为字符串），取决于isChecked()相应QCheckBox().
此外，我正在使用locationand name(in args) 来构建将安装虚拟环境的路径，这很好用。
有人可以解释为什么venv.create()不接受来自的论点isChecked()吗QCheckBox()？还是我错过了什么？
重现代码：
from subprocess import Popen, PIPE, CalledProcessError
from functools import partial
import venv
import os
from PyQt5 import QtWidgets, QtGui, QtCore
from PyQt5.QtGui import QIcon
from PyQt5.QtCore import Qt, QObject, QTimer, QThread, pyqtSignal, pyqtSlot
from PyQt5.QtWidgets import (QApplication, QFileDialog, QGridLayout, QLabel,
QVBoxLayout, QWizard, QWizardPage, QProgressBar,
QCheckBox, QLineEdit, QGroupBox, QToolButton,
QComboBox, QDialog, QHBoxLayout)
#]===========================================================================[#
#] FIND INSTALLED INTERPRETERS [#============================================[#
#]===========================================================================[#
# look for installed Python 3 versions
versions = ['3.9', '3.8', '3.7', '3.6', '3.5', '3.4', '3.3', '3']
notFound = []
versFound = []
pathFound = []
for i, v in enumerate(versions):
try:
# get installed python3 versions
getVers = Popen(["python" + v, "-V"],
stdout=PIPE, universal_newlines=True)
version = getVers.communicate()[0].strip()
# get paths of the python executables
getPath = Popen(["which", "python" + v],
stdout=PIPE, universal_newlines=True)
path = getPath.communicate()[0].strip()
versFound.append(version)
pathFound.append(path)
except (CalledProcessError, FileNotFoundError):
notFound.append(i)
#]===========================================================================[#
#] PROGRESS BAR [#===========================================================[#
#]===========================================================================[#
class ProgBarWidget(QDialog):
"""
The dialog that shows a progress bar during the create process.
"""
def __init__(self):
super().__init__()
self.initMe()
def initMe(self):
self.setGeometry(690, 365, 325, 80)
self.setFixedSize(325, 80)
self.setWindowTitle("Creating")
self.setWindowFlag(Qt.WindowCloseButtonHint, False)
self.setWindowFlag(Qt.WindowMinimizeButtonHint, False)
horizontalLayout = QHBoxLayout(self)
verticalLayout = QVBoxLayout()
statusLabel = QLabel(self)
statusLabel.setText("Creating virtual environment...")
self.progressBar = QProgressBar(self)
self.progressBar.setFixedSize(300, 23)
self.progressBar.setRange(0, 0)
verticalLayout.addWidget(statusLabel)
verticalLayout.addWidget(self.progressBar)
horizontalLayout.addLayout(verticalLayout)
self.setLayout(horizontalLayout)
#]===========================================================================[#
#] VENV WIZARD [#============================================================[#
#]===========================================================================[#
class VenvWizard(QWizard):
"""
Wizard for creating and setting up virtual environments.
"""
def __init__(self):
super().__init__()
self.setWindowTitle("Venv Wizard")
self.resize(535, 430)
self.move(578, 183)
self.setStyleSheet(
"""
QToolTip {
background-color: rgb(47, 52, 63);
border: rgb(47, 52, 63);
color: rgb(210, 210, 210);
padding: 2px;
opacity: 325
}
"""
)
self.addPage(BasicSettings())
self.addPage(InstallPackages())
self.addPage(Summary())
class BasicSettings(QWizardPage):
"""
Basic settings of the virtual environment being created.
"""
def __init__(self):
super().__init__()
folder_icon = QIcon.fromTheme("folder")
self.setTitle("Basic Settings")
self.setSubTitle("This wizard will help you to create and set up "
"a virtual environment for Python 3. ")
#]===================================================================[#
#] PAGE CONTENT [#===================================================[#
#]===================================================================[#
interpreterLabel = QLabel("&Interpreter:")
self.interprComboBox = QComboBox()
interpreterLabel.setBuddy(self.interprComboBox)
# add items from versFound to combobox
self.interprComboBox.addItem("---")
for i in range(len(versFound)):
self.interprComboBox.addItem(versFound[i], pathFound[i])
venvNameLabel = QLabel("Venv &name:")
self.venvNameLineEdit = QLineEdit()
venvNameLabel.setBuddy(self.venvNameLineEdit)
venvLocationLabel = QLabel("&Location:")
self.venvLocationLineEdit = QLineEdit()
venvLocationLabel.setBuddy(self.venvLocationLineEdit)
selectFolderToolButton = QToolButton()
selectFolderToolButton.setFixedSize(26, 27)
selectFolderToolButton.setIcon(folder_icon)
selectFolderToolButton.setToolTip("Browse")
placeHolder = QLabel()
# the 'options' groupbox
groupBox = QGroupBox("Options")
self.withPipCBox = QCheckBox("Install and update &Pip")
self.sitePackagesCBox = QCheckBox(
"&Make system (global) site-packages dir available to venv")
self.launchVenvCBox = QCheckBox(
"Launch a terminal with activated &venv after installation")
self.symlinksCBox = QCheckBox(
"Attempt to &symlink rather than copy files into venv")
# events
self.withPipCBox.toggled.connect(self.collectData)
self.sitePackagesCBox.toggled.connect(self.collectData)
self.launchVenvCBox.toggled.connect(self.collectData)
self.venvNameLineEdit.textChanged.connect(self.collectData)
self.venvLocationLineEdit.textChanged.connect(self.collectData)
self.interprComboBox.currentIndexChanged.connect(self.collectData)
self.symlinksCBox.toggled.connect(self.collectData)
selectFolderToolButton.clicked.connect(self.selectDir)
# store the collected data in line edits
self.interprVers = QLineEdit()
self.interprPath = QLineEdit()
self.venvName = QLineEdit()
self.venvLocation = QLineEdit()
self.withPip = QLineEdit()
self.sitePackages = QLineEdit()
self.launchVenv = QLineEdit()
self.symlinks = QLineEdit()
# register fields
self.registerField("interprComboBox*", self.interprComboBox)
self.registerField("venvNameLineEdit*", self.venvNameLineEdit)
self.registerField("venvLocationLineEdit*", self.venvLocationLineEdit)
self.registerField("interprVers", self.interprVers)
self.registerField("interprPath", self.interprPath)
self.registerField("venvName", self.venvName)
self.registerField("venvLocation", self.venvLocation)
self.registerField("withPip", self.withPip)
self.registerField("sitePackages", self.sitePackages)
self.registerField("launchVenv", self.launchVenv)
self.registerField("symlinks", self.symlinks)
# grid layout
gridLayout = QGridLayout()
gridLayout.addWidget(interpreterLabel, 0, 0, 1, 1)
gridLayout.addWidget(self.interprComboBox, 0, 1, 1, 2)
gridLayout.addWidget(venvNameLabel, 1, 0, 1, 1)
gridLayout.addWidget(self.venvNameLineEdit, 1, 1, 1, 2)
gridLayout.addWidget(venvLocationLabel, 2, 0, 1, 1)
gridLayout.addWidget(self.venvLocationLineEdit, 2, 1, 1, 1)
gridLayout.addWidget(selectFolderToolButton, 2, 2, 1, 1)
gridLayout.addWidget(placeHolder, 3, 0, 1, 2)
gridLayout.addWidget(groupBox, 4, 0, 1, 3)
self.setLayout(gridLayout)
# 'options' groupbox
groupBoxLayout = QVBoxLayout()
groupBoxLayout.addWidget(self.withPipCBox)
groupBoxLayout.addWidget(self.sitePackagesCBox)
groupBoxLayout.addWidget(self.launchVenvCBox)
groupBoxLayout.addWidget(self.symlinksCBox)
groupBox.setLayout(groupBoxLayout)
#]=======================================================================[#
#] SELECTIONS [#=========================================================[#
#]=======================================================================[#
def selectDir(self):
"""
Specify path where to create venv.
"""
folderName = QFileDialog.getExistingDirectory()
self.venvLocationLineEdit.setText(folderName)
def collectData(self, i):
"""
Collect all input data and create the virtual environment.
"""
self.interprVers.setText(self.interprComboBox.currentText())
self.interprPath.setText(self.interprComboBox.currentData())
self.venvName.setText(self.venvNameLineEdit.text())
self.venvLocation.setText(self.venvLocationLineEdit.text())
# the 'options'
self.withPip.setText(str(self.withPipCBox.isChecked()))
self.sitePackages.setText(str(self.sitePackagesCBox.isChecked()))
self.launchVenv.setText(str(self.launchVenvCBox.isChecked()))
self.symlinks.setText(str(self.symlinksCBox.isChecked()))
#]===========================================================================[#
#] WORKER [#================================================================[#
#]===========================================================================[#
class InstallWorker(QObject):
"""
Worker informing about start and finish of the create process.
"""
started = pyqtSignal()
finished = pyqtSignal()
@pyqtSlot(tuple)
def install(self, args):
self.started.emit()
name, location, with_pip, site_packages, symlinks = args
# outputs as excpected
#print(args)
#print("pip:", args[2], "\nsite-pkgs:", args[3], "\nsymlinks:", args[4])
venv.create(
os.path.join(location, name), # 'location' and 'name' works
with_pip=with_pip, # installs pip always (the default)
system_site_packages=site_packages, # not tested yet
symlinks=symlinks, # never symlinking
)
self.finished.emit()
class InstallPackages(QWizardPage):
"""
Install packages via `pip` into the created virtual environment.
"""
def __init__(self):
super().__init__()
self.setTitle("Install Packages")
self.setSubTitle("Specify the packages which you want Pip to "
"install into the virtual environment.")
self.progressBar = ProgBarWidget()
#]===================================================================[#
#] THREAD [#========================================================[#
#]===================================================================[#
thread = QThread(self)
thread.start()
self.m_install_worker = InstallWorker()
self.m_install_worker.moveToThread(thread)
self.m_install_worker.started.connect(self.progressBar.exec_)
self.m_install_worker.finished.connect(self.progressBar.close)
self.m_install_worker.finished.connect(self.reEnablePage)
#]===================================================================[#
#] PAGE CONTENT [#===================================================[#
#]===================================================================[#
# just some test content (page is still in development)
TestLabel = QLabel("This is a test label:", self)
TestLineEdit = QLineEdit(self)
TestLabel.setBuddy(TestLineEdit)
TestLabel2 = QLabel("This is a test label:", self)
TestLineEdit2 = QLineEdit(self)
TestLabel2.setBuddy(TestLineEdit2)
v_layout = QVBoxLayout(self)
v_layout.addWidget(TestLabel)
v_layout.addWidget(TestLineEdit)
v_layout.addWidget(TestLabel2)
v_layout.addWidget(TestLineEdit2)
self.setLayout(v_layout)
def initializePage(self):
#interprVers = self.field("interprVers")
self.interprPath = self.field("interprPath")
self.venvName = self.field("venvName")
self.venvLocation = self.field("venvLocation")
self.withPip = self.field("withPip")
self.sitePackages = self.field("sitePackages")
#launchVenv = self.field("launchVenv")
self.symlinks = self.field("symlinks")
# set the selected interpreter
sys.executable = self.interprPath
# run the create process
self.createProcess()
# disable the page as long as the progress bar is up
self.setEnabled(False)
def reEnablePage(self):
"""
Re-enable page after the create process has finished.
"""
self.setEnabled(True)
def createProcess(self):
"""
Create the virtual environment.
"""
args = (
self.venvName,
self.venvLocation,
self.withPip,
self.sitePackages,
self.symlinks,
)
wrapper = partial(self.m_install_worker.install, args)
QTimer.singleShot(0, wrapper)
class Summary(QWizardPage):
def __init__(self):
super().__init__()
self.setTitle("Summary")
self.setSubTitle("...............")
if __name__ == "__main__":
import sys
app = QApplication(sys.argv)
wizard = VenvWizard()
wizard.show()
sys.exit(app.exec_())
解决方案
您创建 QLineEdit 只是为了保存不必要的数据，因为您可以将小部件属性注册为复选框的状态。您还将布尔 True 或 False 分别转换为字符串“True”或“False”，然后将其传递给函数 venv.create()，该函数将其转换为布尔值，但任何不为空的字符串都是真实的。
解决方案是直接注册 QCheckBox，除了其他小部件。
class BasicSettings(QWizardPage):
"""
Basic settings of the virtual environment being created.
"""
def __init__(self):
super().__init__()
# ...
groupBox.setLayout(groupBoxLayout)
selectFolderToolButton.clicked.connect(self.selectDir)
self.registerField("interprVers", self.interprComboBox, "currentText")
self.registerField("interprPath", self.interprComboBox, "currentData")
self.registerField("venvName", self.venvNameLineEdit)
self.registerField("venvLocation", self.venvLocationLineEdit)
self.registerField("withPip", self.withPipCBox)
self.registerField("sitePackages", self.sitePackagesCBox)
self.registerField("launchVenv", self.launchVenvCBox)
self.registerField("symlinks", self.symlinksCBox)
# ...
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