Assistance required during installation process

[jackwalsh5801]

hello, I am a new beginner when it comes to python, but very experienced with legos official software. i figured after spending years programming using word blocks that i would make the next step towards learning python. my question is simple, how do i install NXT - python? i have honestly spent hours trying to understand how to even begin the installation process, and i still cannot understand how to install it after ive installed numerous versions of python. could you please assist me in translating the installation process into a words that are understandable to an extremely new beginner? Thank you

[schodet]

First, keep in mind that NXT-Python is running on your computer, not on the brick, which makes a real difference. You can use NXC to program the NXT on the brick with a text based language.

For NXT-Python, first make sure that you have a working python3 installation, then clone this repository:

git clone https://github.com/schodet/nxt-python.git

And install the module:

cd nxt-python
python3 setup.py install

For a simpler method, you will have to wait a little bit that I publish the first python 3 release (I expect to do it in December), then installation instructions will be simpler.

[JoseSantos7]

hello

I am also new to this - specifically python and lego nxt . I recently have been handled a lego nxt Mindstorms set

I expect this could be an enriching source; I don't know how to put this to work in python + Mac

sorry for the ignorance, what do you mean by:

And install the module:

cd nxt-python python3 setup.py install

thank you for your help

[schodet]

These are commands to run from the command line, change to the directory you downloaded nxt-python, then run the setup.py script with the install parameter.

You need to learn how to use Python first if you want to use NXT-Python.

[auryan898]

@JoseSantos7 Anything in quotation marks below, feel free to search its meaning on Google or some other search engine.

---

So first go to the Python.org website and install "Python 3.8, 3.9, or 3.10" for Mac.
Now go and install "Git VCS", look for Downloads > Binary Installer as a Beginner's option.

When both of those are done, open up a "Terminal" on your Mac computer

Then input the commands shown above, pressing the Enter/Return key at the end of each line:

git clone https://github.com/schodet/nxt-python.git
cd nxt-python
python3 setup.py install

If you get an error on that last line, then do python setup.py install instead.

If you are still lost on installation, then search online for "Installing Python Modules setup.py" and find a tutorial or guide that makes it work for you.

[schodet]

Keep in mind that I plan to do an alpha release in December, there will be some interface changes.

[JoseSantos7]

thank you both

it installed everything except the error below. pybluez is to make possible the connection via bluetooth?

do you know why?

message conveyed:

Download error on https://pypi.org/simple/pybluez/: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:997) -- Some packages may not be found! Couldn't find index page for 'pybluez' (maybe misspelled?) Scanning index of all packages (this may take a while) Reading https://pypi.org/simple/ Download error on https://pypi.org/simple/: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:997) -- Some packages may not be found! No local packages or working download links found for pybluez>=0.23 error: Could not find suitable distribution for Requirement.parse('pybluez>=0.23')

I will try to find similar issues on stack overflow maybe

thank you

[schodet]

Yes, pybluez is only for Bluetooth.

There seems to be something wrong with your installation, is your OS up to date? Are you using a proxy which filter HTTPS?

[JoseSantos7]

the system is up to date

the question "Are you using a proxy which filter HTTPS?" is something beyond my comprehension

so it communicates via usb or bluetooth, but it would be nice to have bluetooth available

pip install pybluez is the only command to activate bluetooth?

many thanks

[schodet]

This means that something is broken on your computer or network:

Download error on https://pypi.org/simple/pybluez/: [SSL: CERTIFICATE_VERIFY_FAILED]

You could try again, and include a full log of what command you typed and what was the result, but this has nothing to do with NXT-Python.

By the way, I made the alpha release, so you can try it like this:

python3 -m pip install --upgrade --pre nxt-python

Here is what I get on my computer:

nicolas@boktor:~/work/lego/nxt-python% python3 -m pip install --upgrade --pre nxt-python
Collecting nxt-python
  Downloading nxt_python-3.0.0a1-py3-none-any.whl (74 kB)
     |████████████████████████████████| 74 kB 1.9 MB/s
Collecting pybluez>=0.23
  Using cached PyBluez-0.23.tar.gz (97 kB)
Collecting pyusb>=1.2.1
  Using cached pyusb-1.2.1-py3-none-any.whl (58 kB)
Using legacy 'setup.py install' for pybluez, since package 'wheel' is not installed.
Installing collected packages: pyusb, pybluez, nxt-python
    Running setup.py install for pybluez ... done
Successfully installed nxt-python-3.0.0a1 pybluez-0.23 pyusb-1.2.1
nicolas@boktor:~/work/lego/nxt-python%

Please use triple back-quotes to insert the log like I just did.

[JoseSantos7]

it is somewhat different from yours...

  Downloading pre-1.3.0.tar.gz (704 bytes)
  Preparing metadata (setup.py) ... done
Requirement already satisfied: nxt-python in /Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages (2.2.2)
Using legacy 'setup.py install' for pre, since package 'wheel' is not installed.
Installing collected packages: pre
    Running setup.py install for pre ... done
Successfully installed pre-1.3.0```

[schodet]

You installed the package pre…

I guess you forgot the -- before pre, or that you have a space between them.

Just copy/paste the command line.

[JoseSantos7]

thank you for your help

I am doing something wrong and I don't get what it is....

Requirement already satisfied: nxt-python in /Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages (2.2.2)
Collecting nxt-python
  Using cached nxt_python-3.0.0a1-py3-none-any.whl (74 kB)
Collecting pyusb>=1.2.1
  Using cached pyusb-1.2.1-py3-none-any.whl (58 kB)
Collecting pybluez>=0.23
  Using cached PyBluez-0.23.tar.gz (97 kB)
  Preparing metadata (setup.py) ... error
  ERROR: Command errored out with exit status 1:
   command: /Library/Frameworks/Python.framework/Versions/3.10/bin/python3 -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/_z/m60znzld66189n8_4_83xr8m0000gn/T/pip-install-wu8lqimg/pybluez_f98e4e47e4c14b73b87b61b2de157283/setup.py'"'"'; __file__='"'"'/private/var/folders/_z/m60znzld66189n8_4_83xr8m0000gn/T/pip-install-wu8lqimg/pybluez_f98e4e47e4c14b73b87b61b2de157283/setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(__file__) if os.path.exists(__file__) else io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /private/var/folders/_z/m60znzld66189n8_4_83xr8m0000gn/T/pip-pip-egg-info-xu6ffga2
       cwd: /private/var/folders/_z/m60znzld66189n8_4_83xr8m0000gn/T/pip-install-wu8lqimg/pybluez_f98e4e47e4c14b73b87b61b2de157283/
  Complete output (1 lines):
  error in PyBluez setup command: use_2to3 is invalid.
  ----------------------------------------
WARNING: Discarding https://files.pythonhosted.org/packages/08/9f/e9d93b266d2d1ea988780a52a696073ba0a65df65a532165fdf6ff90d0ed/PyBluez-0.23.tar.gz#sha256=c8f04d2e78951eaa9de486b4d49381704e8943d0a6e6e58f55fcd7b8582e90de (from https://pypi.org/simple/pybluez/). Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.```

[schodet]

I do not think it’s you, there is several issues open on PyBluez for python 3.10.

For example: https://github.com/pybluez/pybluez/issues/424

Could you try with python 3.7?

---

Also, I am not sure whether it installed nxt-python from a previously built cached package or if it comes from PyPI, as the version in the git repo was also 3.0.0a1. You can try with --no-cache-dir and --force-reinstall if this is a problem:

python3 -m pip install --upgrade --no-cache-dir --force-reinstall --pre nxt-python

---

Are you able to use the USB connection? If you run nxt_test, it should detect the NXT brick and play a sound.

I am writing a NXT-Python tutorial for the next alpha release.

[JoseSantos7]

hello

honestly, thank you for your dedication and help

how can I evaluate if the usb is working?

what is the file or something else through which python communicates via usb with the brick?

sorry for the ignorance, I went to directory nxt-python and I can't find any program 'nxt-test.py' to run

I have others like motor.py, brick.py, etc

thank you

[schodet]

If nxt-python is installed correctly, nxt_test should be in your $PATH, this means that you can run in from anywhere just by typing nxt_test on the command prompt.

If that does not work, you can find it in scripts:

cd "where you have cloned nxt-python"/scripts
./nxt_test

This one: https://github.com/schodet/nxt-python/blob/master/scripts/nxt_test

[JoseSantos7]

ok

the brick is turned on and with usb cable connected

nxt_test file is here, I can see it

after nxt_testthis is what happens

  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 573, in _build_master
    ws.require(__requires__)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 891, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 782, in resolve
    raise VersionConflict(dist, req).with_context(dependent_req)
pkg_resources.VersionConflict: (nxt-python 2.2.2 (/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages), Requirement.parse('nxt-python==3.0.0a1'))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.10/bin/nxt_test", line 4, in <module>
    __import__('pkg_resources').run_script('nxt-python==3.0.0a1', 'nxt_test')
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 3267, in <module>
    def _initialize_master_working_set():
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 3241, in _call_aside
    f(*args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 3279, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 575, in _build_master
    return cls._build_from_requirements(__requires__)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 588, in _build_from_requirements
    dists = ws.resolve(reqs, Environment())
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 777, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'pybluez>=0.23' distribution was not found and is required by nxt-python```

last lines is misleading, seems it is still looking for pybluez

[schodet]

This looks strange too:

pkg_resources.VersionConflict: (nxt-python 2.2.2 (/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages), Requirement.parse('nxt-python==3.0.0a1'))

It looks like there is a 2.2.2 version installed somewhere.

---

I made a 3.0.0a2 version which drops the pybluez requirement, can you try to install it?

Once this works I may have another solution for Bluetooth.

[JoseSantos7]

hi there

I am struggling a little bit, so I will remove everything ok and reinstall again

hope it works

via usb, there is nothing to, running a script without any further action will work in the brick?

thank you

[schodet]

Yes, it should work without any further action.

[JoseSantos7]

hi there

it seems not be looking anymore for pybluez but everything else seems the same, after I got rid of and reinstalled eveyrhing again (python 3.10 from their site and nxt package from here)

don't know why the conflict version: pkg_resources.VersionConflict: (nxt-python 2.2.2 (/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages), Requirement.parse('nxt-python==3.0.0a2'))

the entire reaction is this:

  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 573, in _build_master
    ws.require(__requires__)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 891, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 782, in resolve
    raise VersionConflict(dist, req).with_context(dependent_req)
pkg_resources.VersionConflict: (nxt-python 2.2.2 (/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages), Requirement.parse('nxt-python==3.0.0a2'))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.10/bin/nxt_test", line 4, in <module>
    __import__('pkg_resources').run_script('nxt-python==3.0.0a2', 'nxt_test')
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 3267, in <module>
    def _initialize_master_working_set():
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 3241, in _call_aside
    f(*args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 3279, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 575, in _build_master
    return cls._build_from_requirements(__requires__)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 588, in _build_from_requirements
    dists = ws.resolve(reqs, Environment())
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 777, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'pyusb>=1.2.1' distribution was not found and is required by nxt-python

[schodet]

It seems that there is a 2.2.2 version in /Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages.

Can you try to find help from someone who knows mac OS? I suppose that this directory was not emptied when you got rid of everything.

[JoseSantos7]

yes, thank you

@auryan898 are you proficient with this?

can you help me overcome this issue? the version conflict and the rest...

thank you

[Svein-Tore]

Hi! As many other here I have problems with the installation of the nxt-python. After trying a lot of things I thought it was a good idea to reinstall, and ran the folllwoing commad:

python3 -m pip install --upgrade --no-cache-dir --force-reinstall --pre nxt-python Result: Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple Collecting nxt-python Downloading https://files.pythonhosted.org/packages/58/7c/51804d620621a661a1c5c39c15245dbfe3d21dc7faf0539c97ac81fa0cdc/nxt_python-3.0.0a1-py3-none-any.whl (74kB) 100% |████████████████████████████████| 81kB 4.2MB/s Collecting pyusb>=1.2.1 (from nxt-python) Downloading https://files.pythonhosted.org/packages/15/a8/4982498b2ab44d1fcd5c49f07ea3795eab01601dc143b009d333fcace3b9/pyusb-1.2.1-py3-none-any.whl (58kB) 100% |████████████████████████████████| 61kB 5.1MB/s Collecting pybluez>=0.23; platform_system == "Linux" (from nxt-python) Downloading https://www.piwheels.org/simple/pybluez/PyBluez-0.23-cp37-cp37m-linux_armv7l.whl (132kB) 100% |████████████████████████████████| 133kB 1.3MB/s Installing collected packages: pyusb, pybluez, nxt-python Found existing installation: pyusb 1.2.1 Uninstalling pyusb-1.2.1: Successfully uninstalled pyusb-1.2.1 Found existing installation: PyBluez 0.23 Uninstalling PyBluez-0.23: Successfully uninstalled PyBluez-0.23 Found existing installation: nxt-python 3.0.0a1 Uninstalling nxt-python-3.0.0a1: Successfully uninstalled nxt-python-3.0.0a1 Successfully installed nxt-python-3.0.0a1 pybluez-0.23 pyusb-1.2.1

Going through this info it seems to me I have done a successfull installation. But then by executing nxt_test I got the following:

pi@raspberrypi:~/.local/bin $ nxt_test Traceback (most recent call last): File "/home/pi/.local/bin/nxt_test", line 7, in import nxt.locator ImportError: bad magic number in 'nxt': b'\x03\xf3\r\n'

Any suggetions?

I have to mention that I have python 3.7 and I'm running a RPi 4. I have only tried with bluetooth, not with USB connection.

[schodet]

pi@raspberrypi:~/.local/bin $ nxt_test Traceback (most recent call last): File "/home/pi/.local/bin/nxt_test", line 7, in import nxt.locator ImportError: bad magic number in 'nxt': b'\x03\xf3\r\n'

Any suggetions?

You seems to have a nxt or nxt.py file in .local/bin, where does it come from? Not from nxt-python.

Please use triple backquotes when pasting in github. Also, you are hijacking a issue for an unrelated problem, please use the mailing list.

[schodet]

@JoseSantos7 look at your /Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages directory, there must be an old nxt-python version here, please remove it and retry.

[schodet]

Closing, please recontact me if you need more help.