Support absolute paths for SQLite

This makes it compatible with dj-database-url [1].

1: https://github.com/kennethreitz/dj-database-url#id6

Author: blueyed

databases/core.py

@@ -351,7 +351,10 @@ def netloc(self) -> typing.Optional[str]:
 
     @property
     def database(self) -> str:
-        return self.components.path.lstrip("/")
+        path = self.components.path
+        if path[:1] == "/":
+            return path[1:]
+        return path
 
     @property
     def options(self) -> dict:

tests/test_database_url.py

@@ -51,3 +51,9 @@ def test_replace_database_url_components():
     new = u.replace(database="test_" + u.database)
     assert new.database == "test_mydatabase"
     assert str(new) == "sqlite:///test_mydatabase"
+
+    u = DatabaseURL("sqlite:////absolute/path")
+    assert u.database == "/absolute/path"
+    new = u.replace(database=u.database + "_test")
+    assert new.database == "/absolute/path_test"
+    assert str(new) == "sqlite:////absolute/path_test"