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venv/Lib/site-packages/django/db/backends/base/client.py

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+import os
+import subprocess
+
+
+class BaseDatabaseClient:
+    """Encapsulate backend-specific methods for opening a client shell."""
+    # This should be a string representing the name of the executable
+    # (e.g., "psql"). Subclasses must override this.
+    executable_name = None
+
+    def __init__(self, connection):
+        # connection is an instance of BaseDatabaseWrapper.
+        self.connection = connection
+
+    @classmethod
+    def settings_to_cmd_args_env(cls, settings_dict, parameters):
+        raise NotImplementedError(
+            'subclasses of BaseDatabaseClient must provide a '
+            'settings_to_cmd_args_env() method or override a runshell().'
+        )
+
+    def runshell(self, parameters):
+        args, env = self.settings_to_cmd_args_env(self.connection.settings_dict, parameters)
+        env = {**os.environ, **env} if env else None
+        subprocess.run(args, env=env, check=True)