Microsoft Windows [Version 10.0.16299.309]
(c) 2017 Microsoft Corporation. All rights reserved.

C:\Users\Lewis>pip install pipenv
You are using pip version 6.0.8, however version 9.0.3 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
Collecting pipenv
  Downloading pipenv-11.9.0.tar.gz (5.0MB)
    100% |################################| 5.0MB 123kB/s
    error in pipenv setup command: 'install_requires' must be a string or list of strings containing valid project/version requirement specifiers
    Complete output from command python setup.py egg_info:
    error in pipenv setup command: 'install_requires' must be a string or list of strings containing valid project/version requirement specifiers

    ----------------------------------------
    Command "python setup.py egg_info" failed with error code 1 in C:\Users\Lewis\AppData\Local\Temp\pip-build-jazhenwq\pipenv

C:\Users\Lewis>pip install --upgrade pip
You are using pip version 6.0.8, however version 9.0.3 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
Collecting pip from https://pypi.python.org/packages/ac/95/a05b56bb975efa78d3557efa36acaf9cf5d2fd0ee0062060493687432e03/pip-9.0.3-py2.py3-none-any.whl#md5=d512ceb964f38ba31addb8142bc657cb
  Downloading pip-9.0.3-py2.py3-none-any.whl (1.4MB)
    100% |################################| 1.4MB 385kB/s
Installing collected packages: pip
  Found existing installation: pip 6.0.8
    Uninstalling pip-6.0.8:
      Successfully uninstalled pip-6.0.8

  Exception:
  Traceback (most recent call last):
    File "C:\Python34\lib\shutil.py", line 371, in _rmtree_unsafe
      os.unlink(fullname)
  PermissionError: [WinError 5] Access is denied: 'C:\\Users\\Lewis\\AppData\\Local\\Temp\\pip-8x6q46tu-uninstall\\python34\\scripts\\pip.exe'

  During handling of the above exception, another exception occurred:

  Traceback (most recent call last):
    File "C:\Python34\lib\site-packages\pip\basecommand.py", line 232, in main
      logger.debug('Exception information:', exc_info=True)
    File "C:\Python34\lib\site-packages\pip\commands\install.py", line 347, in run
      home=temp_target_dir,
    File "C:\Python34\lib\site-packages\pip\req\req_set.py", line 560, in install
      # Then inside find_requirement existing_applicable -> False
    File "C:\Python34\lib\site-packages\pip\req\req_install.py", line 680, in commit_uninstall
      )
    File "C:\Python34\lib\site-packages\pip\req\req_uninstall.py", line 153, in commit
      self.file = pth_file
    File "C:\Python34\lib\site-packages\pip\_vendor\retrying.py", line 49, in wrapped_f
      return Retrying(*dargs, **dkw).call(f, *args, **kw)
    File "C:\Python34\lib\site-packages\pip\_vendor\retrying.py", line 212, in call
      raise attempt.get()
    File "C:\Python34\lib\site-packages\pip\_vendor\retrying.py", line 247, in get
      six.reraise(self.value[0], self.value[1], self.value[2])
    File "C:\Python34\lib\site-packages\pip\_vendor\six.py", line 659, in reraise
      _assertCountEqual = "assertItemsEqual"
    File "C:\Python34\lib\site-packages\pip\_vendor\retrying.py", line 200, in call
      attempt = Attempt(fn(*args, **kwargs), attempt_number, False)
    File "C:\Python34\lib\site-packages\pip\utils\__init__.py", line 61, in rmtree
      SUPPORTED_EXTENSIONS += BZ2_EXTENSIONS
    File "C:\Python34\lib\shutil.py", line 478, in rmtree
      return _rmtree_unsafe(path, onerror)
    File "C:\Python34\lib\shutil.py", line 368, in _rmtree_unsafe
      _rmtree_unsafe(fullname, onerror)
    File "C:\Python34\lib\shutil.py", line 368, in _rmtree_unsafe
      _rmtree_unsafe(fullname, onerror)
    File "C:\Python34\lib\shutil.py", line 373, in _rmtree_unsafe
      onerror(os.unlink, fullname, sys.exc_info())
    File "C:\Python34\lib\site-packages\pip\utils\__init__.py", line 73, in rmtree_errorhandler
      def import_or_raise(pkg_or_module_string, ExceptionType, *args, **kwargs):
  PermissionError: [WinError 5] Access is denied: 'C:\\Users\\Lewis\\AppData\\Local\\Temp\\pip-8x6q46tu-uninstall\\python34\\scripts\\pip.exe'


C:\Users\Lewis>