Async Subprocess Patterns

PyQt6 Thread-Based Runner

from PyQt6.QtCore import QThread, pyqtSignal
import subprocess
import sys

class CommandRunner(QThread):
    """Non-blocking command runner with real-time output"""
    
    output_line = pyqtSignal(str)      # Each line of output
    error_line = pyqtSignal(str)       # Error output
    process_finished = pyqtSignal(int) # Exit code
    process_started = pyqtSignal()     # Process started