title: can't remove python pip
body: <p>i've installed both python3 and python
  it used to work everything perfect
  but today i encountered several issues with <strong>pip</strong></p>
  
  <p>then i tried to uninstall it and install it again
  i've made </p>
  
  <pre><code>sudo apt-get remove pip
  sudo apt-get remove pip3
  sudo apt-get purge pip
  sudo apt-get purge pip3
  sudo apt-get remove python-setuptools
  sudo apt-get remove python3-setuptools
  </code></pre>
  
  <p>and
  when i write down "pip"
  at the prompt i still have this error:</p>
  
  <pre><code>    Traceback (most recent call last):
    File "/usr/local/bin/pip", line 9, in &lt;module&gt;
      load_entry_point('pip==9.0.1', 'console_scripts', 'pip')()
    File "/usr/lib/python3/dist-packages/pkg_resources.py", line 356, in load_entry_point
      return get_distribution(dist).load_entry_point(group, name)
    File "/usr/lib/python3/dist-packages/pkg_resources.py", line 2476, in load_entry_point
      return ep.load()
    File "/usr/lib/python3/dist-packages/pkg_resources.py", line 2190, in load
      ['__name__'])
    File "/usr/local/lib/python3.4/dist-packages/pip-9.0.1-py3.4.egg/pip/__init__.py", line 21, in &lt;module&gt;
      from pip._vendor.requests.packages.urllib3.exceptions import DependencyWarning
    File "/usr/local/lib/python3.4/dist-packages/pip-9.0.1-py3.4.egg/pip/_vendor/requests/__init__.py", line 65, in &lt;module&gt;
      from . import utils
    File "/usr/local/lib/python3.4/dist-packages/pip-9.0.1-py3.4.egg/pip/_vendor/requests/utils.py", line 22, in &lt;module&gt;
      from . import certs
    File "&lt;frozen importlib._bootstrap&gt;", line 2237, in _find_and_load
    File "&lt;frozen importlib._bootstrap&gt;", line 2226, in _find_and_load_unlocked
    File "&lt;frozen importlib._bootstrap&gt;", line 1200, in _load_unlocked
    File "&lt;frozen importlib._bootstrap&gt;", line 1129, in _exec
    File "&lt;frozen importlib._bootstrap&gt;", line 1467, in exec_module
    File "&lt;frozen importlib._bootstrap&gt;", line 1570, in get_code
    File "&lt;frozen importlib._bootstrap&gt;", line 656, in _compile_bytecode
  ValueError: bad marshal data (unknown type code)
  </code></pre>
  
  <p>what do you suggest?
  thanks</p>