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I want to install paho-mqtt using this command:

$ sudo apt-get install python-pip

Collecting paho-mqtt

Exception:

Traceback (most recent call last):

  File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 215, in main

    status = self.run(options, args)

  File "/usr/lib/python2.7/dist-packages/pip/commands/install.py", line 353, in run

    wb.build(autobuilding=True)

  File "/usr/lib/python2.7/dist-packages/pip/wheel.py", line 749, in build

    self.requirement_set.prepare_files(self.finder)

  File "/usr/lib/python2.7/dist-packages/pip/req/req_set.py", line 380, in prepare_files

    ignore_dependencies=self.ignore_dependencies))

  File "/usr/lib/python2.7/dist-packages/pip/req/req_set.py", line 554, in _prepare_file

    require_hashes

  File "/usr/lib/python2.7/dist-packages/pip/req/req_install.py", line 278, in populate_link

    self.link = finder.find_requirement(self, upgrade)

  File "/usr/lib/python2.7/dist-packages/pip/index.py", line 465, in find_requirement

    all_candidates = self.find_all_candidates(req.name)

  File "/usr/lib/python2.7/dist-packages/pip/index.py", line 423, in find_all_candidates

    for page in self._get_pages(url_locations, project_name):

  File "/usr/lib/python2.7/dist-packages/pip/index.py", line 568, in _get_pages

    page = self._get_page(location)

  File "/usr/lib/python2.7/dist-packages/pip/index.py", line 683, in _get_page

    return HTMLPage.get_page(link, session=self.session)

  File "/usr/lib/python2.7/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/python2.7/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'

pip is the python package manager, it works a lot like apt but for python packages. apt-get install python-pip installs just pip. It does not install any packages. instead try:

pip install paho-mqtt

and if that doesn't work (often doesn't) try

sudo pip install paho-mqtt

You can specify the python version (make sure it's installed before you try to use it ;) )

sudo pip2 install paho-mqtt

or

sudo pip3 install paho-mqtt