« RuntimeError: profondeur de récursivité maximale dépassée tout en appelant un objet Python » erreur en python PyQt4

Question

Je crée un simple éditeur de texte dans PyQt4 par Pygments Syntex surligneur. J'ai le code suivant.

from PyQt4 import QtCore, QtGui 
import time,sys 
from PyQt4.QtGui import * 
from PyQt4.QtCore import * 
from pygments import highlight 
from pygments.lexers import PythonLexer,get_lexer_by_name 
from pygments.formatters import HtmlFormatter 
def highlighter(): 
     text = area.toPlainText() 
     result = highlight(text, lexer, formatter) 
     area.setText(result) 

code = 'print ("Hello World")\n# Test Program' 

lexer = get_lexer_by_name("python3", stripall=True) 
formatter = HtmlFormatter(linenos=False,style='colorful') 
formatter.noclasses = True 
result = highlight(code, lexer, formatter) 

app = QApplication(sys.argv) 
w=QWidget() 
w.setGeometry(500,400,350,350) 

area = QTextEdit(w) 
area.setGeometry(0,10,350,340) 
area.setText(result) 
area.textChanged.connect(highlighter) 

w.show() 
sys.exit(app.exec_()) 

Lorsque la première fois, il la charge correctement en sortie, mais si je tape un seul mot en QTextEdit il attend pendant 1-2 secondes et affiche l'erreur suivante:

Traceback (most recent call last): File "C:\Users\Home\Desktop\code_highlighter - Copy.py", line 10, in highlight er 
    result = highlight(text, lexer, formatter) File "C:\Python34\lib\site-packages\pygments\__init__.py", line 85, in highlig ht 
    return format(lex(code, lexer), formatter, outfile) File "C:\Python34\lib\site-packages\pygments\__init__.py", line 64, in format 
    formatter.format(tokens, realoutfile) File "C:\Python34\lib\site-packages\pygments\formatter.py", line 95, in format 

    return self.format_unencoded(tokensource, outfile) File "C:\Python34\lib\site-packages\pygments\formatters\html.py", line 850, in format_unencoded 
    for t, piece in source: File "C:\Python34\lib\site-packages\pygments\formatters\html.py", line 690, in _wrap_div 
    for tup in inner: File "C:\Python34\lib\site-packages\pygments\formatters\html.py", line 708, in _wrap_pre 
    for tup in inner: File "C:\Python34\lib\site-packages\pygments\formatters\html.py", line 727, in _format_lines 
    for ttype, value in tokensource: File "C:\Python34\lib\site-packages\pygments\lexer.py", line 191, in streamer 
    for _, t, v in self.get_tokens_unprocessed(text): File "C:\Python34\lib\site-packages\pygments\lexer.py", line 624, in get_token s_unprocessed 
    statestack = list(stack) RuntimeError: maximum recursion depth exceeded while calling a Python object Traceback (most recent call last): File "C:\Users\Home\Desktop\code_highlighter - Copy.py", line 10, in highlight er 
    result = highlight(text, lexer, formatter) File "C:\Python34\lib\site-packages\pygments\__init__.py", line 85, in highlig ht 
    return format(lex(code, lexer), formatter, outfile) File "C:\Python34\lib\site-packages\pygments\__init__.py", line 64, in format 
    formatter.format(tokens, realoutfile) File "C:\Python34\lib\site-packages\pygments\formatter.py", line 95, in format 

    return self.format_unencoded(tokensource, outfile) File "C:\Python34\lib\site-packages\pygments\formatters\html.py", line 850, in format_unencoded 
    for t, piece in source: File "C:\Python34\lib\site-packages\pygments\formatters\html.py", line 690, in _wrap_div 
    for tup in inner: File "C:\Python34\lib\site-packages\pygments\formatters\html.py", line 708, in _wrap_pre 
    for tup in inner: File "C:\Python34\lib\site-packages\pygments\formatters\html.py", line 727, in _format_lines 
    for ttype, value in tokensource: File "C:\Python34\lib\site-packages\pygments\lexer.py", line 191, in streamer 
    for _, t, v in self.get_tokens_unprocessed(text): File "C:\Python34\lib\site-packages\pygments\lexer.py", line 624, in get_token s_unprocessed 
    statestack = list(stack) RuntimeError: maximum recursion depth exceeded while calling a Python object 

Est-ce que beaucoup de choses peuvent ne m'aide pas. Je ne sais pas où je me trompe. Aidez-moi, s'il vous plaît.

Answer 1

appelle la fonction Votre highlighter()area.setText(), qui émettra le signal textChanged qui est relié à highlighter, qui appelle area.setText() qui ... et ainsi de suite.

Pour un QTextEdit le signal textChaged est toujours émis lorsque la méthode setText() est appelée, même si le contenu du texte visible ne modifie pas, parce que sa représentation interne change.

Une solution simple dans votre cas serait de bloquer la livraison de signaux lorsque vous appelez setText():

def highlighter(): 
     text = area.toPlainText() 
     result = highlight(text, lexer, formatter) 
     area.blockSignals(True) 
     pos = area.textCursor().position() 
     area.setText(result) 
     cursor = area.textCursor() 
     cursor.setPosition(min(pos, len(area.toPlainText()))) 
     area.setTextCursor(cursor) 
     area.blockSignals(False)