Remove environment variable dependency

activity_browser/__init__.py

@@ -2,6 +2,10 @@
 import sys
 from logging import getLogger
 
+try:
+    import PySide6
+except ImportError:
+    import PySide2
 
 from .logger import log_file_location, setup_ab_logging
 from .mod import bw2data

activity_browser/actions/pyside_upgrade.py

@@ -62,7 +62,6 @@ class PySideUpgradeThread(threading.ABThread):
 
     def run_safely(self):
         self.pip_installation()
-        self.set_conda_env_var()
         self.restart()
 
     def pip_installation(self):
@@ -86,15 +85,6 @@ def pip_installation(self):
 
         assert process.returncode == 0, "Failed to install PySide6"
 
-    def set_conda_env_var(self):
-        """
-        Set the QT_API QtPy environment variable persistently for this conda environment
-        """
-        self.status.emit(0, "Setting QT_API environment variable")
-
-        subprocess.run(["conda", "env", "config", "vars", "set", "QT_API=pyside6"])
-        os.environ["QT_API"] = "pyside6"  # also set for the env directly for the restart
-
     def restart(self):
         """
         Restarts the Activity Browser through a subprocess. Sleeps 5 seconds to allow the user to register