2022-05-23 00:16:32 +04:00

32 lines
1.2 KiB
Python

# Copyright 2018-2022 Streamlit Inc.
#
# 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.
def open_python_file(filename):
"""Open a read-only Python file taking proper care of its encoding.
In Python 3, we would like all files to be opened with utf-8 encoding.
However, some author like to specify PEP263 headers in their source files
with their own encodings. In that case, we should respect the author's
encoding.
"""
import tokenize
if hasattr(tokenize, "open"): # Added in Python 3.2
# Open file respecting PEP263 encoding. If no encoding header is
# found, opens as utf-8.
return tokenize.open(filename)
else:
return open(filename, "r", encoding="utf-8")