copying from old repo

1 files changed, 45 insertions, 0 deletions

diff --git a/extension/examples/filesystem/filesystem.py b/extension/examples/filesystem/filesystem.py
new file mode 100644
index 00000000..eb5c2043
--- /dev/null
+++ b/extension/examples/filesystem/filesystem.py
@@ -0,0 +1,45 @@
+from abc import ABC, abstractmethod
+from typing import List
+
+
+class FileSystem(ABC):
+    """An abstract filesystem that can read/write from a set of files."""
+    @abstractmethod
+    def read(self, path) -> str:
+        raise NotImplementedError
+
+    @abstractmethod
+    def readlines(self, path) -> List[str]:
+        raise NotImplementedError
+
+    @abstractmethod
+    def write(self, path, content):
+        raise NotImplementedError
+
+    @abstractmethod
+    def exists(self, path) -> bool:
+        raise NotImplementedError
+
+    @abstractmethod
+    def rename_file(self, filepath: str, new_filepath: str):
+        raise NotImplementedError
+
+    @abstractmethod
+    def walk(self, path: str) -> List[str]:
+        raise NotImplementedError
+
+    @abstractmethod
+    def rename_directory(self, path: str, new_path: str):
+        raise NotImplementedError
+
+    @abstractmethod
+    def delete_file(self, filepath: str):
+        raise NotImplementedError
+
+    @abstractmethod
+    def delete_directory(self, path: str):
+        raise NotImplementedError
+
+    @abstractmethod
+    def add_directory(self, path: str):
+        raise NotImplementedError