[Python] How to Optimize PyQt6 Applicaitons

I'm building Python IDE and i ran into this problem. there are some function that makes my IDE delay, lags and freezes, i did some debugging and i found what makes my app freezes its this function

import ast


func_class_instances = {}

def list_classes_functions(code):
try:
func_class_instances.clear()
tree = ast.parse(code)

for node in ast.walk(tree):
if isinstance(node, ast.Assign):
if isinstance(node.value, ast.Call) and isinstance(node.value.func, ast.Name):
class_name = node.value.func.id
if class_name == 'int' or class_name == 'len' or class_name == 'str':
continue
else:
func_class_instances[class_name] = 'class'


elif isinstance(node, ast.Call):
func = node.func
if isinstance(func, ast.Attribute):
func_class_instances[func.attr] = 'function'


return func_class_instances

except Exception:
func_class_instances.clear()
return func_class_instances


this code return a dict of funciton calls and classes called in the current file.

here is how i used it:

import ast
from PyQt6.QtGui import QTextCursor, QColor, QTextCharFormat, QTextCursor, QColor
from PyQt6.QtCore import QTimer

from func_classes import list_classes_functions


class ShowErrors:
def __init__(self, parent, highlighter):
parent.textChanged.connect(self.schedule_check)
self.timer = QTimer()
self.timer.setSingleShot(True)
self.timer.timeout.connect(self.check_syntax)
self.error_label = None
self.parent = parent
self.highlighter = highlighter

def schedule_check(self):
self.timer.start(500)

def check_syntax(self):
code = self.parent.toPlainText()


self.clear_error_highlighting()
try:
ast.parse(code)
if self.error_label:
self.error_label.setText("✅ No syntax errors")

self.analyze_code(self.parent)


except (SyntaxError, NameError) as e:
if self.error_label:
self.error_label.setText(f"❌ Line {e.lineno}: {e.msg}")

self.underline_error(e.lineno, e.offset)

def clear_error_highlighting(self):
cursor = self.parent.textCursor()

cursor.select(QTextCursor.SelectionType.Document)
fmt = QTextCharFormat()
fmt.setUnderlineStyle(QTextCharFormat.UnderlineStyle.NoUnderline)
cursor.setCharFormat(fmt)

def underline_error(self, line, column):
cursor = self.parent.textCursor()

cursor.movePosition(QTextCursor.MoveOperation.Start)
for _ in range(line - 1):
cursor.movePosition(QTextCursor.MoveOperation.Down)

cursor.movePosition(QTextCursor.MoveOperation.Right, n=column - 1)
cursor.movePosition(QTextCursor.MoveOperation.Right, QTextCursor.MoveMode.KeepAnchor)

fmt = QTextCharFormat()
fmt.setUnderlineStyle(QTextCharFormat.UnderlineStyle.SpellCheckUnderline)
fmt.setUnderlineColor(QColor("red"))
cursor.setCharFormat(fmt)

def analyze_code(self, main_text):
code = main_text.toPlainText()
self.highlighter.set_code(code)

instances = list_classes_functions(code)
self.highlighter.get_calls(instances)

self.highlighter.rehighlight()


and a second function is the highlighting logic which highlights keywords, functions, etc.

cant really show the code here its 300+lines but here is the github repo.

tried to make it update if only the dict has been changed but it did not worked

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