[英]Arguments passed to venv.create() have no effect when creating a virtual environment
我正在使用PyQt5向導來創建Python虛擬環境。 創建環境是可行的。 參數（例如，帶有或不帶有pip ，...）從QCheckBox()傳遞到Python隨附的venv模塊的create()函數。
問題在於傳遞給venv.create()的參數對虛擬環境的創建沒有影響。 始終使用默認設置創建它（例如，默認情況下安裝pip ）。
但是，如果我直接通過with_pip=False ，將不會安裝pip 。 這意味着，出於某種原因，從args傳遞的args對創建沒有影響。 我嘗試將值轉換為bool() ，但這沒有用。
我不清楚為什么，因為print(args)輸出True或False （作為字符串），具體取決於相應QCheckBox()的isChecked()狀態。
此外，我正在使用location和name （在args ）來構建將要安裝虛擬環境的路徑，並且可以正常工作。
有人可以解釋為什么venv.create()不接受來自QCheckBox() isChecked()的參數嗎？ 還是我錯過了什么？
復制代碼：
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_())
創建QLineEdit只是為了保存不必要的數據，因為您可以將小部件屬性注冊為復選框的狀態。 您還將布爾值True或False分別轉換為字符串“ True”或“ False”，然后將其傳遞給函數venv.create（），該函數會將其轉換為布爾值，但任何不為空的字符串都是真實的。
解決方案是除了其他小部件之外，直接注冊QCheckBox。
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)
# ...
使用命令“virtualenv venv”創建Python虛擬環境時出錯
[英]Error when using the command "virtualenv venv" to create Python virtual environment
嘗試導入模塊並運行虛擬環境 (venv) 時找不到模塊
[英]Module is not found when trying to import it and running a virtual environment (venv)
使用內置 venv 在 Windows 上創建虛擬環境不適用於 Python 3.8
[英]Creating a virtual environment is not working with Python 3.8 on Windows using built-in venv
現在 python 2 已棄用，我們還需要使用 venv 來創建虛擬環境嗎？
[英]Now that python 2 is deprecated, do we still need to use the venv for creating virtual environment?
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