Develop Reference

running any pip commands results in an attribute error

Pip seems to have broken all of a sudden in my virtual environment (venv). When running any pip command, (like pip install --upgrade pip), I get the following error:
Traceback (most recent call last):
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_internal/cli/base_command.py", line 165, in exc_logging_wrapper
status = run_func(*args)
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_internal/cli/req_command.py", line 205, in wrapper
return func(self, options, args)
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_internal/commands/install.py", line 339, in run
requirement_set = resolver.resolve(
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_internal/resolution/resolvelib/resolver.py", line 94, in resolve
result = self._result = resolver.resolve(
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_vendor/resolvelib/resolvers.py", line 481, in resolve
state = resolution.resolve(requirements, max_rounds=max_rounds)
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_vendor/resolvelib/resolvers.py", line 348, in resolve
self._add_to_criteria(self.state.criteria, r, parent=None)
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_vendor/resolvelib/resolvers.py", line 172, in _add_to_criteria
if not criterion.candidates:
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_vendor/resolvelib/structs.py", line 151, in __bool__
return bool(self._sequence)
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_internal/resolution/resolvelib/found_candidates.py", line 155, in __bool__
return any(self)
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_internal/resolution/resolvelib/found_candidates.py", line 143, in <genexpr>
return (c for c in iterator if id(c) not in self._incompatible_ids)
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_internal/resolution/resolvelib/found_candidates.py", line 44, in _iter_built
for version, func in infos:
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_internal/resolution/resolvelib/factory.py", line 294, in iter_index_candidate_infos
result = self._finder.find_best_candidate(
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_internal/index/package_finder.py", line 868, in find_best_candidate
candidates = self.find_all_candidates(project_name)
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_internal/index/package_finder.py", line 809, in find_all_candidates
page_candidates = list(page_candidates_it)
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_internal/index/sources.py", line 134, in page_candidates
yield from self._candidates_from_page(self._link)
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_internal/index/package_finder.py", line 769, in process_project_url
html_page = self._link_collector.fetch_page(project_url)
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_internal/index/collector.py", line 604, in fetch_page
return _get_html_page(location, session=self.session)
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_internal/index/collector.py", line 509, in _get_html_page
resp = _get_html_response(url, session=session)
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_internal/index/collector.py", line 125, in _get_html_response
resp = session.get(
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_vendor/requests/sessions.py", line 542, in get
return self.request('GET', url, **kwargs)
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_internal/network/session.py", line 454, in request
return super().request(method, url, *args, **kwargs)
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_vendor/requests/sessions.py", line 529, in request
resp = self.send(prep, **send_kwargs)
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_vendor/requests/sessions.py", line 645, in send
r = adapter.send(request, **kwargs)
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_vendor/cachecontrol/adapter.py", line 57, in send
resp = super(CacheControlAdapter, self).send(request, **kw)
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_vendor/requests/adapters.py", line 413, in send
conn = self.get_connection(request.url, proxies)
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_vendor/requests/adapters.py", line 316, in get_connection
conn = self.poolmanager.connection_from_url(url)
File "/home/user/code/home-stuff/.venv/lib/python3.10/site-packages/pip/_vendor/urllib3/poolmanager.py", line 299, in connection_from_url
u.host_ip, port=u.port, scheme=u.scheme, pool_kwargs=pool_kwargs
AttributeError: 'Url' object has no attribute 'host_ip'
I'm running linux mint 21 with Python 3.10. Not sure what caused this issue as the only changes I've made recently were system updates (via apt upgrade).

After poking around for a bit and trying a few things, I deleted my virtual environment (rm -rf .venv) and recreated it via python -m venv .venv.

Can not use pip install on Windows 10

When I was trying to install PyQt5 on Windows 10, I got the following error:
C:\Users\USER_NAME>pip install PyQt5
ERROR: Exception:
Traceback (most recent call last):
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\cli\base_command.py", line 180, in _main
status = self.run(options, args)
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\cli\req_command.py", line 205, in wrapper
return func(self, options, args)
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\commands\install.py", line 318, in run
requirement_set = resolver.resolve(
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\resolution\resolvelib\resolver.py", line 127, in resolve
result = self._result = resolver.resolve(
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 473, in resolve
state = resolution.resolve(requirements, max_rounds=max_rounds)
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 341, in resolve
name, crit = self._merge_into_criterion(r, parent=None)
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 172, in _merge_into_criterion
if not criterion.candidates:
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_vendor\resolvelib\structs.py", line 139, in __bool__
return bool(self._sequence)
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\resolution\resolvelib\found_candidates.py", line 143, in __bool__
return any(self)
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\resolution\resolvelib\found_candidates.py", line 129, in <genexpr>
return (c for c in iterator if id(c) not in self._incompatible_ids)
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\resolution\resolvelib\found_candidates.py", line 30, in _iter_built
for version, func in infos:
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\resolution\resolvelib\factory.py", line 269, in iter_index_candidate_infos
result = self._finder.find_best_candidate(
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\index\package_finder.py", line 879, in find_best_candidate
candidates = self.find_all_candidates(project_name)
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\index\package_finder.py", line 824, in find_all_candidates
page_candidates = list(page_candidates_it)
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\index\sources.py", line 134, in page_candidates
yield from self._candidates_from_page(self._link)
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\index\package_finder.py", line 783, in process_project_url
html_page = self._link_collector.fetch_page(project_url)
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\index\collector.py", line 512, in fetch_page
return _get_html_page(location, session=self.session)
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\index\collector.py", line 422, in _get_html_page
resp = _get_html_response(url, session=session)
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\index\collector.py", line 120, in _get_html_response
resp = session.get(
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_vendor\requests\sessions.py", line 555, in get
return self.request('GET', url, **kwargs)
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\network\session.py", line 449, in request
return super().request(method, url, *args, **kwargs)
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_vendor\requests\sessions.py", line 542, in request
resp = self.send(prep, **send_kwargs)
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_vendor\requests\sessions.py", line 655, in send
r = adapter.send(request, **kwargs)
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_vendor\cachecontrol\adapter.py", line 53, in send
resp = super(CacheControlAdapter, self).send(request, **kw)
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_vendor\requests\adapters.py", line 439, in send
resp = conn.urlopen(
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_vendor\urllib3\connectionpool.py", line 696, in urlopen
self._prepare_proxy(conn)
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_vendor\urllib3\connectionpool.py", line 964, in _prepare_proxy
conn.connect()
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_vendor\urllib3\connection.py", line 359, in connect
conn = self._connect_tls_proxy(hostname, conn)
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_vendor\urllib3\connection.py", line 500, in _connect_tls_proxy
return ssl_wrap_socket(
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_vendor\urllib3\util\ssl_.py", line 432, in ssl_wrap_socket
ssl_sock = _ssl_wrap_socket_impl(sock, context, tls_in_tls)
File "c:\users\andrew\appdata\local\programs\python\python39\lib\site-packages\pip\_vendor\urllib3\util\ssl_.py", line 474, in _ssl_wrap_socket_impl
return ssl_context.wrap_socket(sock)
File "c:\users\andrew\appdata\local\programs\python\python39\lib\ssl.py", line 500, in wrap_socket
return self.sslsocket_class._create(
File "c:\users\andrew\appdata\local\programs\python\python39\lib\ssl.py", line 997, in _create
raise ValueError("check_hostname requires server_hostname")
ValueError: check_hostname requires server_hostname
I have tried all the methods on this link and none of them helps. What could be the problem here? I have spent a lot of time on this. Thank you so much!!!
I don't have a proxy server on my system, does it matter? It might not be the problem of PyQt5. It might be the problem of my system.

I would try downloading anaconda, it has the pyQt5 environment, also when downloading / installing, make sure you click the update path option.

Go through these below, but it'd also be helpful if you could verify that you have pip installed correctly with pip -V.
https://www.geeksforgeeks.org/how-to-install-pip-on-windows/
https://stackoverflow.com/a/44232032/12406158

How to resolve PIP exception from Proxy issues

Just moved to a new work computer and I seem to be getting the following error when I try to use pip. Wondering what the issue could be, python 3.7.2 on Windows 10.
Is it that my work password has characters that aren't allowed?
Strange because my older computer didn't have this issue.
Exception:
Traceback (most recent call last):
File "C:\Program Files\Python37\lib\site-packages\pip\_internal\cli\base_command.py", line 143, in main
status = self.run(options, args)
File "C:\Program Files\Python37\lib\site-packages\pip\_internal\commands\install.py", line 318, in run
resolver.resolve(requirement_set)
File "C:\Program Files\Python37\lib\site-packages\pip\_internal\resolve.py", line 102, in resolve
self._resolve_one(requirement_set, req)
File "C:\Program Files\Python37\lib\site-packages\pip\_internal\resolve.py", line 256, in _resolve_one
abstract_dist = self._get_abstract_dist_for(req_to_install)
File "C:\Program Files\Python37\lib\site-packages\pip\_internal\resolve.py", line 199, in _get_abstract_dist_for
skip_reason = self._check_skip_installed(req)
File "C:\Program Files\Python37\lib\site-packages\pip\_internal\resolve.py", line 170, in _check_skip_installed
self.finder.find_requirement(req_to_install, upgrade=True)
File "C:\Program Files\Python37\lib\site-packages\pip\_internal\index.py", line 572, in find_requirement
all_candidates = self.find_all_candidates(req.name)
File "C:\Program Files\Python37\lib\site-packages\pip\_internal\index.py", line 530, in find_all_candidates
for page in self._get_pages(url_locations, project_name):
File "C:\Program Files\Python37\lib\site-packages\pip\_internal\index.py", line 675, in _get_pages
page = self._get_page(location)
File "C:\Program Files\Python37\lib\site-packages\pip\_internal\index.py", line 793, in _get_page
return _get_html_page(link, session=self.session)
File "C:\Program Files\Python37\lib\site-packages\pip\_internal\index.py", line 144, in _get_html_page
"Cache-Control": "max-age=0",
File "C:\Program Files\Python37\lib\site-packages\pip\_vendor\requests\sessions.py", line 525, in get
return self.request('GET', url, **kwargs)
File "C:\Program Files\Python37\lib\site-packages\pip\_internal\download.py", line 396, in request
return super(PipSession, self).request(method, url, *args, **kwargs)
File "C:\Program Files\Python37\lib\site-packages\pip\_vendor\requests\sessions.py", line 512, in request
resp = self.send(prep, **send_kwargs)
File "C:\Program Files\Python37\lib\site-packages\pip\_vendor\requests\sessions.py", line 622, in send
r = adapter.send(request, **kwargs)
File "C:\Program Files\Python37\lib\site-packages\pip\_vendor\requests\adapters.py", line 410, in send
conn = self.get_connection(request.url, proxies)
File "C:\Program Files\Python37\lib\site-packages\pip\_vendor\requests\adapters.py", line 308, in get_connection
proxy_manager = self.proxy_manager_for(proxy)
File "C:\Program Files\Python37\lib\site-packages\pip\_vendor\requests\adapters.py", line 191, in proxy_manager_for
proxy_headers = self.proxy_headers(proxy)
File "C:\Program Files\Python37\lib\site-packages\pip\_vendor\requests\adapters.py", line 389, in proxy_headers
password)
File "C:\Program Files\Python37\lib\site-packages\pip\_vendor\requests\auth.py", line 63, in _basic_auth_str
password = password.encode('latin1')
UnicodeEncodeError: 'latin-1' codec can't encode character '\u201d' in position 0: ordinal not in range(256)

Oops I think I resolved it minutes later. The instructions for the environmental variable for the proxy server password included a "" that wasn't supposed to actually be in the environmental variable text.

Many errors when trying to use pip

When trying to pip install any package (specifically, right now, gspread)...
Full message I get is:
Exception:
Traceback (most recent call last):
File "/Library/Python/2.7/site-packages/pip/basecommand.py", line 211, in main
status = self.run(options, args)
File "/Library/Python/2.7/site-packages/pip/commands/install.py", line 305, in run
wb.build(autobuilding=True)
File "/Library/Python/2.7/site-packages/pip/wheel.py", line 705, in build
self.requirement_set.prepare_files(self.finder)
File "/Library/Python/2.7/site-packages/pip/req/req_set.py", line 334, in prepare_files
functools.partial(self._prepare_file, finder))
File "/Library/Python/2.7/site-packages/pip/req/req_set.py", line 321, in _walk_req_to_install
more_reqs = handler(req_to_install)
File "/Library/Python/2.7/site-packages/pip/req/req_set.py", line 409, in _prepare_file
req_to_install, finder)
File "/Library/Python/2.7/site-packages/pip/req/req_set.py", line 365, in _check_skip_installed
finder.find_requirement(req_to_install, self.upgrade)
File "/Library/Python/2.7/site-packages/pip/index.py", line 486, in find_requirement
all_versions = self._find_all_versions(req.name)
File "/Library/Python/2.7/site-packages/pip/index.py", line 404, in _find_all_versions
index_locations = self._get_index_urls_locations(project_name)
File "/Library/Python/2.7/site-packages/pip/index.py", line 378, in _get_index_urls_locations
page = self._get_page(main_index_url)
File "/Library/Python/2.7/site-packages/pip/index.py", line 818, in _get_page
return HTMLPage.get_page(link, session=self.session)
File "/Library/Python/2.7/site-packages/pip/index.py", line 928, in get_page
"Cache-Control": "max-age=600",
File "/Library/Python/2.7/site-packages/pip/_vendor/requests/sessions.py", line 477, in get
return self.request('GET', url, **kwargs)
File "/Library/Python/2.7/site-packages/pip/download.py", line 373, in request
return super(PipSession, self).request(method, url, *args, **kwargs)
File "/Library/Python/2.7/site-packages/pip/_vendor/requests/sessions.py", line 465, in request
resp = self.send(prep, **send_kwargs)
File "/Library/Python/2.7/site-packages/pip/_vendor/requests/sessions.py", line 573, in send
r = adapter.send(request, **kwargs)
File "/Library/Python/2.7/site-packages/pip/_vendor/cachecontrol/adapter.py", line 46, in send
resp = super(CacheControlAdapter, self).send(request, **kw)
File "/Library/Python/2.7/site-packages/pip/_vendor/requests/adapters.py", line 370, in send
timeout=timeout
File "/Library/Python/2.7/site-packages/pip/_vendor/requests/packages/urllib3/connectionpool.py", line 544, in urlopen
body=body, headers=headers)
File "/Library/Python/2.7/site-packages/pip/_vendor/requests/packages/urllib3/connectionpool.py", line 344, in _make_request
self._raise_timeout(err=e, url=url, timeout_value=conn.timeout)
File "/Library/Python/2.7/site-packages/pip/_vendor/requests/packages/urllib3/connectionpool.py", line 314, in _raise_timeout
if 'timed out' in str(err) or 'did not complete (read)' in str(err): # Python 2.6
TypeError: __str__ returned non-string (type Error)
I am running high sierra,
which pip = /usr/local/bin/pip
python = 2.7.1
I am still new to python and this is my first time using it on this machine. I have googled a lot of different variations of this problem and am unable to figure out what I am doing wrong.
Sorry for such a simple question but any help would be appreciated. Thanks

UnicodeDecodeError in pip install flake8 on Windows 8.1

I'm trying to install the flake8 module for Python (in order to use the SublimeLinter-flake8 package to Sublime Text 3) but get an error message on install (below). What am I doing wrong here?
C:\Windows\system32>python -m pip install flake8
Collecting flake8
Exception:
Traceback (most recent call last):
File "C:\Python27\lib\site-packages\pip\basecommand.py", line 223, in main
status = self.run(options, args)
File "C:\Python27\lib\site-packages\pip\commands\install.py", line 280, in run
requirement_set.prepare_files(finder)
File "C:\Python27\lib\site-packages\pip\req\req_set.py", line 317, in prepare_files
functools.partial(self._prepare_file, finder))
File "C:\Python27\lib\site-packages\pip\req\req_set.py", line 304, in _walk_req_to_install
more_reqs = handler(req_to_install)
File "C:\Python27\lib\site-packages\pip\req\req_set.py", line 439, in _prepare_file
req_to_install.populate_link(finder, self.upgrade)
File "C:\Python27\lib\site-packages\pip\req\req_install.py", line 244, in populate_link
self.link = finder.find_requirement(self, upgrade)
File "C:\Python27\lib\site-packages\pip\index.py", line 486, in find_requirement
all_versions = self._find_all_versions(req.name)
File "C:\Python27\lib\site-packages\pip\index.py", line 404, in _find_all_versions
index_locations = self._get_index_urls_locations(project_name)
File "C:\Python27\lib\site-packages\pip\index.py", line 378, in _get_index_urls_locations
page = self._get_page(main_index_url)
File "C:\Python27\lib\site-packages\pip\index.py", line 810, in _get_page
return HTMLPage.get_page(link, session=self.session)
File "C:\Python27\lib\site-packages\pip\index.py", line 920, in get_page
"Cache-Control": "max-age=600",
File "C:\Python27\lib\site-packages\pip\_vendor\requests\sessions.py", line 477, in get
return self.request('GET', url, **kwargs)
File "C:\Python27\lib\site-packages\pip\download.py", line 373, in request
return super(PipSession, self).request(method, url, *args, **kwargs)
File "C:\Python27\lib\site-packages\pip\_vendor\requests\sessions.py", line 465, in request
resp = self.send(prep, **send_kwargs)
File "C:\Python27\lib\site-packages\pip\_vendor\requests\sessions.py", line 605, in send
r.content
File "C:\Python27\lib\site-packages\pip\_vendor\requests\models.py", line 750, in content
self._content = bytes().join(self.iter_content(CONTENT_CHUNK_SIZE)) or bytes()
File "C:\Python27\lib\site-packages\pip\_vendor\requests\models.py", line 673, in generate
for chunk in self.raw.stream(chunk_size, decode_content=True):
File "C:\Python27\lib\site-packages\pip\_vendor\requests\packages\urllib3\response.py", line 307, in stream
data = self.read(amt=amt, decode_content=decode_content)
File "C:\Python27\lib\site-packages\pip\_vendor\requests\packages\urllib3\response.py", line 243, in read
data = self._fp.read(amt)
File "C:\Python27\lib\site-packages\pip\_vendor\cachecontrol\filewrapper.py", line 54, in read
self.__callback(self.__buf.getvalue())
File "C:\Python27\lib\site-packages\pip\_vendor\cachecontrol\controller.py", line 244, in cache_response
self.serializer.dumps(request, response, body=body),
File "C:\Python27\lib\site-packages\pip\download.py", line 276, in set
return super(SafeFileCache, self).set(*args, **kwargs)
File "C:\Python27\lib\site-packages\pip\_vendor\cachecontrol\caches\file_cache.py", line 99, in set
with self.lock_class(name) as lock:
File "C:\Python27\lib\site-packages\pip\_vendor\lockfile\mkdirlockfile.py", line 18, in __init__
LockBase.__init__(self, path, threaded, timeout)
File "C:\Python27\lib\site-packages\pip\_vendor\lockfile\__init__.py", line 189, in __init__
hash(self.path)))
File "C:\Python27\lib\ntpath.py", line 85, in join
result_path = result_path + p_path
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe4 in position 9: ordinal not in range(128)

After startlingly generous help from Padraic, we eventually figured out that the problem was my computer name, which was Fredrik-Bärbar (notice the ä, i.e. 0xe4 in code page 850, there in the 10th place, or 9th place using Python's 0-based indexing).
(This error is related to that in Pip Error when installing, another question solved by Padraic.)