我在快速入門-ESP-IDF編程指南的第四步失敗了，錯誤訊息如下：

# python -m pip install --user -r $IDF_PATH/requirements.txt
DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for ...