python3+PyQt5 implémente une application d'indexation de pages qui prend en charge le multi-threading

不言
Libérer: 2018-04-20 14:31:33
original
2601 Les gens l'ont consulté

Cet article présente principalement en détail l'implémentation de python3+PyQt5 pour prendre en charge l'application d'indexation de pages multithread, qui a une certaine valeur de référence. Les amis intéressés peuvent s'y référer

Cet article utilise Python3 +pyqt5 et implémente le. exemple d'application d'indexeur de pages dans le chapitre 19 de Programmation rapide de l'interface graphique Python Qt.

/home/yrd/eric_workspace/chap19/walker_ans.py

#!/usr/bin/env python3

import codecs
import html.entities
import re
import sys
from PyQt5.QtCore import (QMutex, QThread,pyqtSignal,Qt)

class Walker(QThread):
 finished = pyqtSignal(bool,int)
 indexed = pyqtSignal(str,int)
 COMMON_WORDS_THRESHOLD = 250
 MIN_WORD_LEN = 3
 MAX_WORD_LEN = 25
 INVALID_FIRST_OR_LAST = frozenset("0123456789_")
 STRIPHTML_RE = re.compile(r"<[^>]*?>", re.IGNORECASE|re.MULTILINE)
 ENTITY_RE = re.compile(r"&(\w+?);|(\d+?);")
 SPLIT_RE = re.compile(r"\W+", re.IGNORECASE|re.MULTILINE)

 def __init__(self, index, lock, files, filenamesForWords,
     commonWords, parent=None):
  super(Walker, self).__init__(parent)
  self.index = index
  self.lock = lock
  self.files = files
  self.filenamesForWords = filenamesForWords
  self.commonWords = commonWords
  self.stopped = False
  self.mutex = QMutex()
  self.completed = False


 def stop(self):
  try:
   self.mutex.lock()
   self.stopped = True
  finally:
   self.mutex.unlock()


 def isStopped(self):
  try:
   self.mutex.lock()
   return self.stopped
  finally:
   self.mutex.unlock()


 def run(self):
  self.processFiles()
  self.stop()
  self.finished.emit(self.completed,self.index)


 def processFiles(self):
  def unichrFromEntity(match):
   text = match.group(match.lastindex)
   if text.isdigit():
    return chr(int(text))
   u = html.entities.name2codepoint.get(text)
   return chr(u) if u is not None else ""

  for fname in self.files:
   if self.isStopped():
    return
   words = set()
   fh = None
   try:
    fh = codecs.open(fname, "r", "UTF8", "ignore")
    text = fh.read()
   except EnvironmentError as e:
    sys.stderr.write("Error: {0}\n".format(e))
    continue
   finally:
    if fh is not None:
     fh.close()
   if self.isStopped():
    return
   text = self.STRIPHTML_RE.sub("", text)
   text = self.ENTITY_RE.sub(unichrFromEntity, text)
   text = text.lower()
   for word in self.SPLIT_RE.split(text):
    if (self.MIN_WORD_LEN <= len(word) <=
     self.MAX_WORD_LEN and
     word[0] not in self.INVALID_FIRST_OR_LAST and
     word[-1] not in self.INVALID_FIRST_OR_LAST):
     try:
      self.lock.lockForRead()
      new = word not in self.commonWords
     finally:
      self.lock.unlock()
     if new:
      words.add(word)
   if self.isStopped():
    return
   for word in words:
    try:
     self.lock.lockForWrite()
     files = self.filenamesForWords[word]
     if len(files) > self.COMMON_WORDS_THRESHOLD:
      del self.filenamesForWords[word]
      self.commonWords.add(word)
     else:
      files.add(str(fname))
    finally:
     self.lock.unlock()
   self.indexed.emit(fname,self.index)
  self.completed = True


/home/yrd/eric_workspace/chap19/pageindexer_ans.pyw

#!/usr/bin/env python3

import collections
import os
import sys
from PyQt5.QtCore import (QDir, QReadWriteLock, QMutex,Qt)
from PyQt5.QtWidgets import (QApplication, QDialog, QFileDialog, QFrame,
        QHBoxLayout, QLCDNumber, QLabel, QLineEdit, QListWidget,
        QPushButton, QVBoxLayout)
import walker_ans as walker


def isAlive(qobj):
 import sip
 try:
  sip.unwrapinstance(qobj)
 except RuntimeError:
  return False
 return True


class Form(QDialog):

 def __init__(self, parent=None):
  super(Form, self).__init__(parent)

  self.mutex = QMutex()
  self.fileCount = 0
  self.filenamesForWords = collections.defaultdict(set)
  self.commonWords = set()
  self.lock = QReadWriteLock()
  self.path = QDir.homePath()
  pathLabel = QLabel("Indexing path:")
  self.pathLabel = QLabel()
  self.pathLabel.setFrameStyle(QFrame.StyledPanel|QFrame.Sunken)
  self.pathButton = QPushButton("Set &Path...")
  self.pathButton.setAutoDefault(False)
  findLabel = QLabel("&Find word:")
  self.findEdit = QLineEdit()
  findLabel.setBuddy(self.findEdit)
  commonWordsLabel = QLabel("&Common words:")
  self.commonWordsListWidget = QListWidget()
  commonWordsLabel.setBuddy(self.commonWordsListWidget)
  filesLabel = QLabel("Files containing the &word:")
  self.filesListWidget = QListWidget()
  filesLabel.setBuddy(self.filesListWidget)
  filesIndexedLabel = QLabel("Files indexed")
  self.filesIndexedLCD = QLCDNumber()
  self.filesIndexedLCD.setSegmentStyle(QLCDNumber.Flat)
  wordsIndexedLabel = QLabel("Words indexed")
  self.wordsIndexedLCD = QLCDNumber()
  self.wordsIndexedLCD.setSegmentStyle(QLCDNumber.Flat)
  commonWordsLCDLabel = QLabel("Common words")
  self.commonWordsLCD = QLCDNumber()
  self.commonWordsLCD.setSegmentStyle(QLCDNumber.Flat)
  self.statusLabel = QLabel("Click the &#39;Set Path&#39; "
         "button to start indexing")
  self.statusLabel.setFrameStyle(QFrame.StyledPanel|QFrame.Sunken)

  topLayout = QHBoxLayout()
  topLayout.addWidget(pathLabel)
  topLayout.addWidget(self.pathLabel, 1)
  topLayout.addWidget(self.pathButton)
  topLayout.addWidget(findLabel)
  topLayout.addWidget(self.findEdit, 1)
  leftLayout = QVBoxLayout()
  leftLayout.addWidget(filesLabel)
  leftLayout.addWidget(self.filesListWidget)
  rightLayout = QVBoxLayout()
  rightLayout.addWidget(commonWordsLabel)
  rightLayout.addWidget(self.commonWordsListWidget)
  middleLayout = QHBoxLayout()
  middleLayout.addLayout(leftLayout, 1)
  middleLayout.addLayout(rightLayout)
  bottomLayout = QHBoxLayout()
  bottomLayout.addWidget(filesIndexedLabel)
  bottomLayout.addWidget(self.filesIndexedLCD)
  bottomLayout.addWidget(wordsIndexedLabel)
  bottomLayout.addWidget(self.wordsIndexedLCD)
  bottomLayout.addWidget(commonWordsLCDLabel)
  bottomLayout.addWidget(self.commonWordsLCD)
  bottomLayout.addStretch()
  layout = QVBoxLayout()
  layout.addLayout(topLayout)
  layout.addLayout(middleLayout)
  layout.addLayout(bottomLayout)
  layout.addWidget(self.statusLabel)
  self.setLayout(layout)

  self.walkers = []
  self.completed = []
  self.pathButton.clicked.connect(self.setPath)
  self.findEdit.returnPressed.connect(self.find)
  self.setWindowTitle("Page Indexer")


 def stopWalkers(self):
  for walker in self.walkers:
   if isAlive(walker) and walker.isRunning():
    walker.stop()
  for walker in self.walkers:
   if isAlive(walker) and walker.isRunning():
    walker.wait()
  self.walkers = []
  self.completed = []


 def setPath(self):
  self.stopWalkers()
  self.pathButton.setEnabled(False)
  path = QFileDialog.getExistingDirectory(self,
     "Choose a Path to Index", self.path)
  if not path:
   self.statusLabel.setText("Click the &#39;Set Path&#39; "
          "button to start indexing")
   self.pathButton.setEnabled(True)
   return
  self.statusLabel.setText("Scanning directories...")
  QApplication.processEvents() # Needed for Windows
  self.path = QDir.toNativeSeparators(path)
  self.findEdit.setFocus()
  self.pathLabel.setText(self.path)
  self.statusLabel.clear()
  self.filesListWidget.clear()
  self.fileCount = 0
  self.filenamesForWords = collections.defaultdict(set)
  self.commonWords = set()
  nofilesfound = True
  files = []
  index = 0
  for root, dirs, fnames in os.walk(str(self.path)):
   for name in [name for name in fnames
       if name.endswith((".htm", ".html"))]:
    files.append(os.path.join(root, name))
    if len(files) == 1000:
     self.processFiles(index, files[:])
     files = []
     index += 1
     nofilesfound = False
  if files:
   self.processFiles(index, files[:])
   nofilesfound = False
  if nofilesfound:
   self.finishedIndexing()
   self.statusLabel.setText(
     "No HTML files found in the given path")


 def processFiles(self, index, files):
  thread = walker.Walker(index, self.lock, files,
    self.filenamesForWords, self.commonWords, self)
  thread.indexed[str,int].connect(self.indexed)
  thread.finished[bool,int].connect(self.finished)
  thread.finished.connect(thread.deleteLater)
  self.walkers.append(thread)
  self.completed.append(False)
  thread.start()
  thread.wait(300) # Needed for Windows


 def find(self):
  word = str(self.findEdit.text())
  if not word:
   try:
    self.mutex.lock()
    self.statusLabel.setText("Enter a word to find in files")
   finally:
    self.mutex.unlock()
   return
  try:
   self.mutex.lock()
   self.statusLabel.clear()
   self.filesListWidget.clear()
  finally:
   self.mutex.unlock()
  word = word.lower()
  if " " in word:
   word = word.split()[0]
  try:
   self.lock.lockForRead()
   found = word in self.commonWords
  finally:
   self.lock.unlock()
  if found:
   try:
    self.mutex.lock()
    self.statusLabel.setText("Common words like &#39;{0}&#39; "
      "are not indexed".format(word))
   finally:
    self.mutex.unlock()
   return
  try:
   self.lock.lockForRead()
   files = self.filenamesForWords.get(word, set()).copy()
  finally:
   self.lock.unlock()
  if not files:
   try:
    self.mutex.lock()
    self.statusLabel.setText("No indexed file contains "
      "the word &#39;{0}&#39;".format(word))
   finally:
    self.mutex.unlock()
   return
  files = [QDir.toNativeSeparators(name) for name in
     sorted(files, key=str.lower)]
  try:
   self.mutex.lock()
   self.filesListWidget.addItems(files)
   self.statusLabel.setText(
     "{0} indexed files contain the word &#39;{1}&#39;".format(
     len(files), word))
  finally:
   self.mutex.unlock()


 def indexed(self, fname, index):
  try:
   self.mutex.lock()
   self.statusLabel.setText(fname)
   self.fileCount += 1
   count = self.fileCount
  finally:
   self.mutex.unlock()
  if count % 25 == 0:
   try:
    self.lock.lockForRead()
    indexedWordCount = len(self.filenamesForWords)
    commonWordCount = len(self.commonWords)
   finally:
    self.lock.unlock()
   try:
    self.mutex.lock()
    self.filesIndexedLCD.display(count)
    self.wordsIndexedLCD.display(indexedWordCount)
    self.commonWordsLCD.display(commonWordCount)
   finally:
    self.mutex.unlock()
  elif count % 101 == 0:
   try:
    self.lock.lockForRead()
    words = self.commonWords.copy()
   finally:
    self.lock.unlock()
   try:
    self.mutex.lock()
    self.commonWordsListWidget.clear()
    self.commonWordsListWidget.addItems(sorted(words))
   finally:
    self.mutex.unlock()


 def finished(self, completed, index):
  done = False
  if self.walkers:
   self.completed[index] = True
   if all(self.completed):
    try:
     self.mutex.lock()
     self.statusLabel.setText("Finished")
     done = True
    finally:
     self.mutex.unlock()
  else:
   try:
    self.mutex.lock()
    self.statusLabel.setText("Finished")
    done = True
   finally:
    self.mutex.unlock()
  if done:
   self.finishedIndexing()


 def reject(self):
  if not all(self.completed):
   self.stopWalkers()
   self.finishedIndexing()
  else:
   self.accept()


 def closeEvent(self, event=None):
  self.stopWalkers()


 def finishedIndexing(self):
  self.filesIndexedLCD.display(self.fileCount)
  self.wordsIndexedLCD.display(len(self.filenamesForWords))
  self.commonWordsLCD.display(len(self.commonWords))
  self.pathButton.setEnabled(True)
  QApplication.processEvents() # Needed for Windows


app = QApplication(sys.argv)
form = Form()
form.show()
app.exec_()
Copier après la connexion

Résultat de l'exécution :

Recommandations associées :

python3+PyQt5+Qt Designer implémente des widgets empilés

python3+PyQt5+Qt Designer implémente une boîte de dialogue étendue

Ce qui précède est le contenu détaillé de. pour plus d'informations, suivez d'autres articles connexes sur le site Web de PHP en chinois!

Étiquettes associées:
source:php.cn
Déclaration de ce site Web
Le contenu de cet article est volontairement contribué par les internautes et les droits d'auteur appartiennent à l'auteur original. Ce site n'assume aucune responsabilité légale correspondante. Si vous trouvez un contenu suspecté de plagiat ou de contrefaçon, veuillez contacter admin@php.cn
Tutoriels populaires
Plus>
Derniers téléchargements
Plus>
effets Web
Code source du site Web
Matériel du site Web
Modèle frontal
À propos de nous Clause de non-responsabilité Sitemap
Site Web PHP chinois:Formation PHP en ligne sur le bien-être public,Aidez les apprenants PHP à grandir rapidement!