Docs: Encourage to used Python 3

Kconfig

@@ -45,12 +45,11 @@ mainmenu "Espressif IoT Development Framework Configuration"
                 a crosstool-ng gcc setup that is in your PATH.
 
         config SDK_PYTHON
-            string "Python 2 interpreter"
+            string "Python interpreter"
             depends on !IDF_CMAKE
             default "python"
             help
-                The executable name/path that is used to run python. On some systems Python 2.x
-                may need to be invoked as python2.
+                The executable name/path that is used to run python.
 
                 (Note: This option is used with the legacy GNU Make build system only.)
 

docs/en/api-guides/build-system.rst

@@ -178,14 +178,15 @@ For more detailed information about integrating ESP-IDF with CMake into an IDE,
 
 .. _setting-python-interpreter:
 
-Setting the Python Interpreter
-------------------------------
+Setting up the Python Interpreter
+---------------------------------
 
-Currently, ESP-IDF only works with Python 2.7. If you have a system where the default ``python`` interpreter is Python 3.x, this can lead to problems.
+ESP-IDF works well with all supported Python versions. It should work out-of-box even if you have a legacy system where the default ``python`` interpreter is still Python 2.7, however, it is advised to switch to Python 3 if possible.
 
-If using ``idf.py``, running ``idf.py`` as ``python2 $IDF_PATH/tools/idf.py ...`` will work around this issue (``idf.py`` will tell other Python processes to use the same Python interpreter). You can set up a shell alias or another script to simplify the command.
+``idf.py`` and other Python scripts will run with the default Python interpreter, i.e. ``python``. You can switch to a
+different one like ``python3 $IDF_PATH/tools/idf.py ...``, or you can set up a shell alias or another script to simplify the command.
 
-If using CMake directly, running ``cmake -D PYTHON=python2 ...`` will cause CMake to override the default Python interpreter.
+If using CMake directly, running ``cmake -D PYTHON=python3 ...`` will cause CMake to override the default Python interpreter.
 
 If using an IDE with CMake, setting the ``PYTHON`` value as a CMake cache override in the IDE UI will override the default Python interpreter.
 

docs/en/get-started-legacy/index.rst

@@ -180,10 +180,10 @@ The python packages required by ESP-IDF are located in ``IDF_PATH/requirements.t
 .. note::
 
     Please check the version of the Python interpreter that you will be using with ESP-IDF. For this, run
-    the command ``python --version`` and depending on the result, you might want to use ``python2``, ``python2.7``
+    the command ``python --version`` and depending on the result, you might want to use ``python3``, ``python3.7``
     or similar instead of just ``python``, e.g.::
 
-        python2.7 -m pip install --user -r $IDF_PATH/requirements.txt
+        python3 -m pip install --user -r $IDF_PATH/requirements.txt
 
 
 .. _get-started-start-project-legacy:
@@ -283,10 +283,6 @@ To navigate and use ``menuconfig``, press the following keys:
 * ``?`` while highlighting a configuration item to display help about that item
 * ``/`` to find configuration items
 
-.. note::
-
-    If you are **Arch Linux** user, navigate to ``SDK tool configuration`` and change the name of ``Python 2 interpreter`` from ``python`` to ``python2``.
-
 .. attention::
 
     If you use ESP32-DevKitC board with the **ESP32-SOLO-1** module, enable single core mode (:ref:`CONFIG_FREERTOS_UNICORE`) in menuconfig before flashing examples.

docs/en/get-started-legacy/linux-setup-scratch.rst

@@ -20,7 +20,7 @@ To compile with ESP-IDF you need to get the following packages:
 
 - Arch::
 
-    sudo pacman -S --needed gcc git make ncurses flex bison gperf python2-pyserial python2-cryptography python2-future python2-pyparsing python2-pyelftools
+    sudo pacman -S --needed gcc git make ncurses flex bison gperf python-pyserial python-cryptography python-future python-pyparsing python-pyelftools
 
 .. note::
 

docs/en/get-started-legacy/linux-setup.rst

@@ -20,7 +20,7 @@ To compile with ESP-IDF you need to get the following packages:
 
 - Arch::
 
-    sudo pacman -S --needed gcc git make flex bison gperf python2-pyserial python2-cryptography python2-future python2-pyparsing python2-pyelftools
+    sudo pacman -S --needed gcc git make flex bison gperf python-pyserial python-cryptography python-future python-pyparsing python-pyelftools
 
 .. note::
 

docs/en/get-started/index.rst

@@ -314,8 +314,6 @@ Linux and macOS
     cd ~/esp/hello_world
     idf.py menuconfig
 
-If your default version of Python is 3.x, you may need to run ``python2 $(which idf.py) menuconfig`` instead.
-
 Windows
 ~~~~~~~
 

docs/en/get-started/linux-setup-scratch.rst

@@ -23,7 +23,7 @@ To compile with ESP-IDF you need to get the following packages:
 
 - Arch::
 
-    sudo pacman -S --needed gcc git make ncurses flex bison gperf python2-pyserial python2-click python2-cryptography python2-future python2-pyparsing python2-pyelftools cmake ninja ccache
+    sudo pacman -S --needed gcc git make ncurses flex bison gperf python-pyserial python-click python-cryptography python-future python-pyparsing python-pyelftools cmake ninja ccache
 
 .. note::
     CMake version 3.5 or newer is required for use with ESP-IDF. Older Linux distributions may require updating, enabling of a "backports" repository, or installing of a "cmake3" package rather than "cmake".

docs/en/get-started/linux-setup.rst

@@ -11,15 +11,15 @@ To compile with ESP-IDF you need to get the following packages:
 
 - CentOS 7::
 
-    sudo yum install git wget flex bison gperf python pyserial python-pyelftools cmake ninja-build ccache
+    sudo yum install git wget flex bison gperf python cmake ninja-build ccache
 
 - Ubuntu and Debian::
 
-    sudo apt-get install git wget flex bison gperf python python-pip python-setuptools python-serial python-click python-cryptography python-future python-pyparsing python-pyelftools cmake ninja-build ccache libffi-dev libssl-dev
+    sudo apt-get install git wget flex bison gperf python python-pip python-setuptools cmake ninja-build ccache libffi-dev libssl-dev
 
 - Arch::
 
-    sudo pacman -S --needed gcc git make flex bison gperf python2-pip python2-pyserial python2-click python2-cryptography python2-future python2-pyparsing python2-pyelftools cmake ninja ccache
+    sudo pacman -S --needed gcc git make flex bison gperf python-pip cmake ninja ccache
 
 .. note::
     CMake version 3.5 or newer is required for use with ESP-IDF. Older Linux distributions may require updating, enabling of a "backports" repository, or installing of a "cmake3" package rather than "cmake".
@@ -32,6 +32,20 @@ Permission issues /dev/ttyUSB0
 
 With some Linux distributions you may get the ``Failed to open port /dev/ttyUSB0`` error message when flashing the {IDF_TARGET_NAME}. :ref:`This can be solved by adding the current user to the dialout group<linux-dialout-group>`.
 
+Setting up Python 3 as default for Ubuntu and Debian
+----------------------------------------------------
+
+Ubuntu and Debian are still providing Python 2.7 as the default interpreter. Python 3 can be installed as follows::
+
+    sudo apt-get install python3 python3-pip python3-setuptools
+
+Making Python 3 the default interpreter is possible by running::
+
+    sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 10
+
+.. note::
+    This is system-wide change which may affect all of the applications.
+
 Next Steps
 ==========
 

docs/en/get-started/windows-setup-scratch.rst

@@ -61,10 +61,10 @@ Download the ninja_ latest stable Windows release from the (`download page <ninj
 The Ninja for Windows download is a .zip file containing a single ``ninja.exe`` file which needs to be unzipped to a directory which is then :ref:`added to your Path <add-directory-windows-path>` (or you can choose a directory which is already on your Path).
 
 
-Python 2.x
-^^^^^^^^^^
+Python
+^^^^^^
 
-Download the latest Python_ 2.7 for Windows installer, and run it.
+Download the latest Python_ for Windows installer, and run it.
 
 The "Customise" step of the Python installer gives a list of options. The last option is "Add python.exe to Path". Change this option to select "Will be installed".
 

docs/zh_CN/contribute/documenting-code.rst

@@ -323,9 +323,9 @@ Doxygen 的安装取决于操作系统：
 
         ::
 
-            $ pacman -S mingw32/mingw-w64-i686-python2-pillow
+            $ pacman -S mingw32/mingw-w64-i686-python-pillow
 
-        查看屏幕上的记录，确定 ``mingw-w64-i686-python2-pillow-4.3.0-1`` 已安装。旧版本 *pillow* 无法运行。
+        查看屏幕上的记录，确定 ``mingw-w64-i686-python-pillow-4.3.0-1`` 已安装。旧版本 *pillow* 无法运行。
 
     Windows 安装 Doxygen 的缺点是 `blockdiag pictures <add-illustrations>` 字体不能正确加载，可能会存在乱码。在此问题解决之前，您可以使用 `interactive shell`_ 查看完整图片。
 

docs/zh_CN/get-started-legacy/index.rst

@@ -178,9 +178,9 @@ ESP-IDF 所需的 Python 软件包位于 ``IDF_PATH/requirements.txt`` 中。您
 
 .. note::
 
-    请注意查询您所使用的 Python 解释器的版本（运行命令 ``python --version``），并根据查询结果将上方命令中的 ``python`` 替换为 ``python2``, ``python2.7``，例如::
+    请注意查询您所使用的 Python 解释器的版本（运行命令 ``python --version``），并根据查询结果将上方命令中的 ``python`` 替换为 ``python3``, ``python3.7``，例如::
 
-        python2.7 -m pip install --user -r $IDF_PATH/requirements.txt
+        python3 -m pip install --user -r $IDF_PATH/requirements.txt
 
 
 .. _get-started-start-project-legacy:
@@ -278,10 +278,6 @@ Windows 操作系统
 * ``英文问号`` （查询配置选项）：调出有关该选项的帮助菜单
 * ``/ 键``：寻找配置工程
 
-.. note::
-
-    如果您是 **Arch Linux** 用户，请前往 ``SDK tool configuration``，并将 ``Python 2 interpreter`` 的名称从 ``python`` 替换为 ``python2``。
-
 .. attention::
 
     如果您使用的是 ESP32-DevKitC（板载 ESP32-SOLO-1 模组），请在烧写示例程序前，前往 ``menuconfig`` 中使能单核模式（:ref:`CONFIG_FREERTOS_UNICORE`）。

docs/zh_CN/get-started-legacy/linux-setup-scratch.rst

@@ -20,7 +20,7 @@
 
 - Arch::
 
-    sudo pacman -S --needed gcc git make ncurses flex bison gperf python2-pyserial python2-cryptography python2-future python2-pyparsing python2-pyelftools
+    sudo pacman -S --needed gcc git make ncurses flex bison gperf python-pyserial python-cryptography python-future python-pyparsing python-pyelftools
 
 .. note::
 

docs/zh_CN/get-started-legacy/linux-setup.rst

@@ -20,7 +20,7 @@ Linux 平台工具链的标准设置（传统 GNU Make）
 
 - Arch::
 
-    sudo pacman -S --needed gcc git make flex bison gperf python2-pyserial python2-cryptography python2-future python2-pyparsing python2-pyelftools
+    sudo pacman -S --needed gcc git make flex bison gperf python-pyserial python-cryptography python-future python-pyparsing python-pyelftools
 
 .. note::
 

docs/zh_CN/get-started/index.rst

@@ -311,8 +311,6 @@ Linux 和 MacOS 操作系统
     cd ~/esp/hello_world
     idf.py menuconfig
 
-如果您的默认 Python 版本为 3.0 及以上，可能需要运行 ``python2 $(which idf.py) menuconfig``。
-
 Windows 操作系统
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

docs/zh_CN/get-started/linux-setup-scratch.rst

@@ -21,7 +21,7 @@
 
 - Arch::
 
-    sudo pacman -S --needed gcc git make ncurses flex bison gperf python2-pyserial python2-click python2-cryptography python2-future python2-pyparsing python2-pyelftools cmake ninja ccache
+    sudo pacman -S --needed gcc git make ncurses flex bison gperf python-pyserial python-click python-cryptography python-future python-pyparsing python-pyelftools cmake ninja ccache
 
 .. note::
     使用 ESP-IDF 需要 CMake 3.5 或以上版本。较早版本的 Linux 可能需要升级才能向后移植仓库，或安装 "cmake3" 软件包，而不是安装 "cmake"。

docs/zh_CN/get-started/linux-setup.rst

@@ -11,15 +11,15 @@ Linux 平台工具链的标准设置
 
 - CentOS 7::
 
-    sudo yum install git wget flex bison gperf python pyserial python-pyelftools cmake ninja-build ccache
+    sudo yum install git wget flex bison gperf python cmake ninja-build ccache
 
 - Ubuntu 和 Debian::
 
-    sudo apt-get install git wget flex bison gperf python python-pip python-setuptools python-serial python-click python-cryptography python-future python-pyparsing python-pyelftools cmake ninja-build ccache libffi-dev libssl-dev
+    sudo apt-get install git wget flex bison gperf python python-pip python-setuptools cmake ninja-build ccache libffi-dev libssl-dev
 
 - Arch::
 
-    sudo pacman -S --needed gcc git make flex bison gperf python2-pip python2-pyserial python2-click python2-cryptography python2-future python2-pyparsing python2-pyelftools cmake ninja ccache
+    sudo pacman -S --needed gcc git make flex bison gperf python-pip python-pyserial cmake ninja ccache
 
 .. note::
     使用 ESP-IDF 需要 CMake 3.5 或以上版本。较早版本的 Linux 可能需要升级才能向后移植仓库，或安装 "cmake3" 软件包，而不是安装 "cmake"。

docs/zh_CN/get-started/windows-setup-scratch.rst

@@ -61,10 +61,10 @@ Ninja 编译工具
 适用于 Windows 平台的 Ninja 下载文件是一个 .zip 文件，包含一个 ``ninja.exe`` 文件。您需要将该文件解压到目录，并 :ref:`添加到您的路径 <add-directory-windows-path>` （或者选择您路径中的已有目录）。
 
 
-Python 2.x
-^^^^^^^^^^
+Python
+^^^^^^
 
-下载并运行适用于 Windows 安装器的最新版 Python_ 2.7。
+下载并运行适用于 Windows 安装器的最新版 Python_。
 
 Python 安装器的“自定义”菜单可为您提供一系列选项，最后一项为 "Add python.exe to Path"（添加 python.exe 到路径中）。请将该选项更改到 "Will be installed"（将会安装）。
 

examples/protocols/esp_local_ctrl/README.md

@@ -18,7 +18,7 @@ python scripts/esp_local_ctrl.py
 Sample output:
 
 ```
-python2 scripts/esp_local_ctrl.py
+python scripts/esp_local_ctrl.py
 
 ==== Acquiring properties information ====
 

examples/protocols/http_server/persistent_sockets/README.md

@@ -8,7 +8,7 @@ This sort of persistency enables the server to have independent sessions/context
 * In order to test the HTTPD server persistent sockets demo :
     1. compile and burn the firmware `idf.py -p PORT flash`
     2. run `idf.py -p PORT monitor` and note down the IP assigned to your ESP module. The default port is 80
-    3. run the test script "python2 scripts/adder.py \<IP\> \<port\> \<N\>"
+    3. run the test script "python scripts/adder.py \<IP\> \<port\> \<N\>"
         * the provided test script sends (POST) numbers from 1 to N to the server which has a URI POST handler for adding these numbers into an accumulator that is valid throughout the lifetime of the connection socket, hence persistent
         * the script does a GET before closing and displays the final value of the accumulator
 

examples/protocols/http_server/simple/README.md

@@ -10,7 +10,7 @@ The Example consists of HTTPD server demo with demostration of URI handling :
     1. compile and burn the firmware `idf.py -p PORT flash`
     2. run `idf.py -p PORT monitor` and note down the IP assigned to your ESP module. The default port is 80
     3. test the example :
-        * run the test script : "python2 scripts/client.py \<IP\> \<port\> \<MSG\>"
+        * run the test script : "python scripts/client.py \<IP\> \<port\> \<MSG\>"
             * the provided test script first does a GET \hello and displays the response
             * the script does a POST to \echo with the user input \<MSG\> and displays the response
         * or use curl (asssuming IP is 192.168.43.130):

tools/mass_mfg/docs/README.rst

@@ -24,7 +24,7 @@ Prerequisites
 	-	Linux / MacOS / Windows (standard distributions)
 
 * The following packages are needed to use this utility:
-	-	Python version: 2.7 (minimum) is required. You can find it here: <https://www.python.org/downloads/>
+	-	Python: <https://www.python.org/downloads/>
 
 .. note::
 

tools/mass_mfg/docs/README_CN.rst

@@ -24,7 +24,7 @@
     -   Linux、MacOS 或 Windows（标准版） 
 
 * 安装依赖包：
-    -   Python：最低版本要求为 2.7。下载地址：https://www.python.org/downloads/。 
+    -   Python： https://www.python.org/downloads/。 
 
 .. note:: 
 

tools/windows/windows_install_prerequisites.sh

@@ -34,7 +34,7 @@ set -e
 pacman --noconfirm -Syu # This step may require the terminal to be closed and restarted
 
 pacman --noconfirm -S --needed gettext-devel gcc git make ncurses-devel flex bison gperf vim \
-       mingw-w64-i686-python2-pip mingw-w64-i686-python2-cryptography unzip winpty
+       mingw-w64-i686-python-pip mingw-w64-i686-python-cryptography unzip winpty
 
 # if IDF_PATH is set, install requirements now as well
 if [ -n "$IDF_PATH" ]; then