Update comments (#4569)

### What problem does this PR solve?

Add license statement.

### Type of change

- [x] Refactoring

Signed-off-by: Jin Hai <[email protected]>

agent/__init__.py

@@ -1,2 +1,18 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+
 from beartype.claw import beartype_this_package
 beartype_this_package()

agent/component/__init__.py

@@ -1,3 +1,19 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+
 import importlib
 from .begin import Begin, BeginParam
 from .generate import Generate, GenerateParam

agent/settings.py

@@ -1,5 +1,5 @@
 #
-#  Copyright 2019 The FATE Authors. All Rights Reserved.
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.

api/__init__.py

@@ -1,2 +1,18 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+
 from beartype.claw import beartype_this_package
 beartype_this_package()

api/utils/t_crypt.py

@@ -1,3 +1,19 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+
 import base64
 import os
 import sys

api/utils/web_utils.py

@@ -1,3 +1,19 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+
 import re
 import socket
 from urllib.parse import urlparse

deepdoc/__init__.py

@@ -1,2 +1,18 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+
 from beartype.claw import beartype_this_package
 beartype_this_package()

deepdoc/parser/__init__.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at

deepdoc/parser/docx_parser.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at

deepdoc/parser/excel_parser.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at

deepdoc/parser/html_parser.py

@@ -1,4 +1,7 @@
 # -*- coding: utf-8 -*-
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at
@@ -11,6 +14,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
+
 from rag.nlp import find_codec
 import readability
 import html_text

deepdoc/parser/json_parser.py

@@ -1,4 +1,20 @@
 # -*- coding: utf-8 -*-
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+
 # The following documents are mainly referenced, and only adaptation modifications have been made
 # from https://github.com/langchain-ai/langchain/blob/master/libs/text-splitters/langchain_text_splitters/json.py
 

deepdoc/parser/markdown_parser.py

@@ -1,4 +1,7 @@
 # -*- coding: utf-8 -*-
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at
@@ -11,6 +14,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
+
 import re
 
 class RAGFlowMarkdownParser:

deepdoc/parser/pdf_parser.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at

deepdoc/parser/ppt_parser.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at
@@ -10,6 +13,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
+
 import logging
 from io import BytesIO
 from pptx import Presentation

deepdoc/parser/resume/__init__.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at

deepdoc/parser/resume/entities/__init__.py

@@ -0,0 +1,15 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#

deepdoc/parser/resume/entities/corporations.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at

deepdoc/parser/resume/entities/degrees.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at

deepdoc/parser/resume/entities/industries.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at

deepdoc/parser/resume/entities/regions.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at
@@ -10,6 +13,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
+
 import re
 
 TBL = {

deepdoc/parser/resume/entities/schools.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at

deepdoc/parser/resume/step_one.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at

deepdoc/parser/resume/step_two.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at
@@ -10,6 +13,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
+
 import logging
 import re
 import copy

deepdoc/parser/txt_parser.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at
@@ -10,6 +13,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
+
 import re
 
 from deepdoc.parser.utils import get_text

deepdoc/parser/utils.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at

deepdoc/vision/__init__.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at

deepdoc/vision/layout_recognizer.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at
@@ -10,6 +13,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
+
 import os
 import re
 from collections import Counter

deepdoc/vision/ocr.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at

deepdoc/vision/postprocess.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at

deepdoc/vision/recognizer.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at

deepdoc/vision/seeit.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at

deepdoc/vision/t_ocr.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at

deepdoc/vision/t_recognizer.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at
@@ -10,6 +13,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
+
 import logging
 import os
 import sys

deepdoc/vision/table_structure_recognizer.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at

intergrations/chatgpt-on-wechat/plugins/__init__.py

@@ -1,3 +1,19 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+
 from beartype.claw import beartype_this_package
 beartype_this_package()
 

intergrations/chatgpt-on-wechat/plugins/ragflow_chat.py

@@ -1,3 +1,19 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+
 import logging
 import requests
 from bridge.context import ContextType  # Import Context, ContextType

rag/__init__.py

@@ -1,2 +1,18 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+
 from beartype.claw import beartype_this_package
 beartype_this_package()

rag/app/__init__.py

@@ -0,0 +1,15 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#

rag/app/audio.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at
@@ -10,6 +13,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
+
 import re
 
 from api.db import LLMType

rag/app/book.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at
@@ -10,6 +13,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
+
 import logging
 from tika import parser
 import re

rag/app/email.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at

rag/app/knowledge_graph.py

@@ -1,3 +1,19 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+
 import re
 
 from graphrag.index import build_knowledge_graph_chunks

rag/app/laws.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at
@@ -10,6 +13,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
+
 import logging
 from tika import parser
 import re

rag/app/manual.py

@@ -1,5 +1,5 @@
 #
-#  Copyright 2024 The InfiniFlow Authors. All Rights Reserved.
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.

rag/app/naive.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at
@@ -10,6 +13,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
+
 import logging
 from tika import parser
 from io import BytesIO

rag/app/one.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at
@@ -10,6 +13,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
+
 import logging
 from tika import parser
 from io import BytesIO

rag/app/paper.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at
@@ -10,6 +13,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
+
 import logging
 import copy
 import re

rag/app/picture.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at
@@ -10,6 +13,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
+
 import io
 
 import numpy as np

rag/app/presentation.py

@@ -1,3 +1,6 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
 #  You may obtain a copy of the License at
@@ -10,6 +13,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
+
 import copy
 import re
 from io import BytesIO