esp32/README: Add info about pyparsing and the correct Python version.
See issue #4655.
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@ -48,12 +48,12 @@ If you use WSL then follow the
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[Linux guidelines](https://esp-idf.readthedocs.io/en/latest/get-started/linux-setup.html)
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for the ESP-IDF instead of the Windows ones.
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The Espressif ESP-IDF instructions above only install pyserial for Python 2,
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so if you're running Python 3 or a non-system Python you'll also need to
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install `pyserial` (or `esptool`) so that the Makefile can flash the board
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and set parameters:
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You will also need either Python 2 or Python 3, along with the `pyserial` and
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`pyparsing` packages installed for the version of Python that you will be using
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(when building you can use, eg, `make PYTHON=python2` to specify the version
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used). To install the required packages do:
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```bash
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$ pip install pyserial
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$ pip install pyserial pyparsing
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```
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Once everything is set up you should have a functioning toolchain with
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