Issues with using pip3 to install python packages

Support
1

PYNQ v2.4
ZCU102

Hi,

So I was trying to run an ipynb project that utilies the fir library. I don’t have the fir library so I used
the instruction sudo pip3 install fir through the ipynb terminal, but it ran unsuccesfully. I noticed that I am having this issue with any python package that i try to install. Is there something wrong with my pynq image? I am able to run python code and load libraries that I have.

I received the error below for the instruction sudo pip3 install fir :

Collecting fir
Exception:
Traceback (most recent call last):
** File “/usr/share/python-wheels/urllib3-1.19.1-py2.py3-none-any.whl/urllib3/connection.py”, line 138, in _new_conn**
** (self.host, self.port), self.timeout, extra_kw)
** File “/usr/share/python-wheels/urllib3-1.19.1-py2.py3-none-any.whl/urllib3/util/connection.py”, line 75, in create_connection**
** for res in socket.getaddrinfo(host, port, family, socket.SOCK_STREAM):**
** File “/usr/lib/python3.6/socket.py”, line 745, in getaddrinfo**
** for res in _socket.getaddrinfo(host, port, family, type, proto, flags):**
socket.gaierror: [Errno -3] Temporary failure in name resolution

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
** File “/usr/share/python-wheels/urllib3-1.19.1-py2.py3-none-any.whl/urllib3/connectionpool.py”, line 594, in urlopen**
** chunked=chunked)**
** File “/usr/share/python-wheels/urllib3-1.19.1-py2.py3-none-any.whl/urllib3/connectionpool.py”, line 350, in _make_request**
** self._validate_conn(conn)**
** File “/usr/share/python-wheels/urllib3-1.19.1-py2.py3-none-any.whl/urllib3/connectionpool.py”, line 837, in _validate_conn**
** conn.connect()**
** File “/usr/share/python-wheels/urllib3-1.19.1-py2.py3-none-any.whl/urllib3/connection.py”, line 281, in connect**
** conn = self._new_conn()**
** File “/usr/share/python-wheels/urllib3-1.19.1-py2.py3-none-any.whl/urllib3/connection.py”, line 147, in _new_conn**
** self, “Failed to establish a new connection: %s” % e)**
requests.packages.urllib3.exceptions.NewConnectionError: <requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7fa96d00f0>:

Failed to establish a new connection: [Errno -3] Temporary failure in name resolution

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
** File “/usr/lib/python3/dist-packages/pip/basecommand.py”, line 215, in main**
** status = self.run(options, args)**
** File “/usr/lib/python3/dist-packages/pip/commands/install.py”, line 353, in run**
** wb.build(autobuilding=True)**
** File “/usr/lib/python3/dist-packages/pip/wheel.py”, line 749, in build**
** self.requirement_set.prepare_files(self.finder)**
** File “/usr/lib/python3/dist-packages/pip/req/req_set.py”, line 380, in prepare_files**
** ignore_dependencies=self.ignore_dependencies))**
** File “/usr/lib/python3/dist-packages/pip/req/req_set.py”, line 554, in _prepare_file**
** require_hashes**
** File “/usr/lib/python3/dist-packages/pip/req/req_install.py”, line 278, in populate_link**
** self.link = finder.find_requirement(self, upgrade)**
** File “/usr/lib/python3/dist-packages/pip/index.py”, line 465, in find_requirement**
** all_candidates = self.find_all_candidates(req.name)**
** File “/usr/lib/python3/dist-packages/pip/index.py”, line 423, in find_all_candidates**
** for page in self._get_pages(url_locations, project_name):**
** File “/usr/lib/python3/dist-packages/pip/index.py”, line 568, in _get_pages**
** page = self._get_page(location)**
** File “/usr/lib/python3/dist-packages/pip/index.py”, line 683, in _get_page**
** return HTMLPage.get_page(link, session=self.session)**
** File “/usr/lib/python3/dist-packages/pip/index.py”, line 792, in get_page**
** “Cache-Control”: “max-age=600”,**
** File “/usr/share/python-wheels/requests-2.12.4-py2.py3-none-any.whl/requests/sessions.py”, line 501, in get**
** return self.request(‘GET’, url, kwargs)
** File “/usr/lib/python3/dist-packages/pip/download.py”, line 386, in request**
** return super(PipSession, self).request(method, url, args, kwargs)
** File “/usr/share/python-wheels/requests-2.12.4-py2.py3-none-any.whl/requests/sessions.py”, line 488, in request*
** resp = self.send(prep, send_kwargs)
** File “/usr/share/python-wheels/requests-2.12.4-py2.py3-none-any.whl/requests/sessions.py”, line 609, in send**
** r = adapter.send(request, kwargs)
** File “/usr/share/python-wheels/CacheControl-0.11.7-py2.py3-none-any.whl/cachecontrol/adapter.py”, line 47, in send**
** resp = super(CacheControlAdapter, self).send(request, kw)
** File “/usr/share/python-wheels/requests-2.12.4-py2.py3-none-any.whl/requests/adapters.py”, line 423, in send**
** timeout=timeout**
** File “/usr/share/python-wheels/urllib3-1.19.1-py2.py3-none-any.whl/urllib3/connectionpool.py”, line 643, in urlopen**
** _stacktrace=sys.exc_info()[2])**
** File “/usr/share/python-wheels/urllib3-1.19.1-py2.py3-none-any.whl/urllib3/util/retry.py”, line 315, in increment**
** total -= 1**
TypeError: unsupported operand type(s) for -=: ‘Retry’ and ‘int’

2

This looks like a connection problem. Is your board connected to the internet?

Cathal

3

So I connected the ethernet port on my ZCU102 to the computer. I assumed that the directions on how to connect to the Jupyter Notebook set the board up with internet connection. Do I have to separately enable internet access on the board?

4

No, this is perhaps the easiest way to connect to your board, but your computer won’t automatically share a network connection.

If you have access to one, you can connect the board directly to a router/switch. You would need to figure out the IP assigned to the board from the router, and use it to connect from your computer.
https://pynq.readthedocs.io/en/v2.5.1/getting_started/zcu104_setup.html#network-connection

Cathak

5

That makes sense! However I am limited to connecting it directly to the computer, but I would just have to figure out a way to bridge that connection to an internet connection just like the documentation stated right?

6

Yes, you can try bridge from your host computer. I’d suggest you just google how to do this for the OS you are using - it isn’t really anything to do with PYNQ - you don’t need to change settings on your board.

Cathal