title: installing requirements with pip
body: <p>I am very new to using python and pip, and I am currently trying to run a python program for the very first time. 
  I downloaded the program on git and the readme file told me to run the command:</p>
  
  <pre><code>pip install -r requirements.txt
  </code></pre>
  
  <p>which I did. I now have an exception that I don't understand. Could you help me? </p>
  
  <p>I tried doing the sudo thing but it didn't help. I am using OS X.</p>
  
  <p>Here is the answer I got from the terminal: </p>
  
  <pre><code>Requirement already satisfied: geopy==1.11.0 in /Library/Python/2.7/site-packages (from -r requirements.txt (line 1))
  Requirement already satisfied: gpsoauth==0.3.0 in /Library/Python/2.7/site-packages (from -r requirements.txt (line 2))
  Collecting protobuf==3.0.0b3 (from -r requirements.txt (line 3))
    Using cached protobuf-3.0.0b3-py2-none-any.whl
  Requirement already satisfied: pycryptodomex==3.4.2 in /Library/Python/2.7/site-packages (from -r requirements.txt (line 4))
  Requirement already satisfied: requests==2.10.0 in /Library/Python/2.7/site-packages (from -r requirements.txt (line 5))
  Requirement already satisfied: s2sphere==0.2.4 in /Library/Python/2.7/site-packages (from -r requirements.txt (line 6))
  Collecting gpxpy==1.1.1 (from -r requirements.txt (line 7))
    Using cached gpxpy-1.1.1.tar.gz
  Collecting six&gt;=1.9 (from protobuf==3.0.0b3-&gt;-r requirements.txt (line 3))
    Using cached six-1.10.0-py2.py3-none-any.whl
  Requirement already satisfied: setuptools in /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python (from protobuf==3.0.0b3-&gt;-r requirements.txt (line 3))
  Requirement already satisfied: future in /Library/Python/2.7/site-packages (from s2sphere==0.2.4-&gt;-r requirements.txt (line 6))
  Installing collected packages: six, protobuf, gpxpy
    Found existing installation: six 1.4.1
      DEPRECATION: Uninstalling a distutils installed project (six) has been deprecated and will be removed in a future version. This is due to the fact that uninstalling a distutils project will only partially uninstall the project.
      Uninstalling six-1.4.1:
  Exception:
  Traceback (most recent call last):
    File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/basecommand.py", line 215, in main
      status = self.run(options, args)
    File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/commands/install.py", line 342, in run
      prefix=options.prefix_path,
    File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/req/req_set.py", line 778, in install
      requirement.uninstall(auto_confirm=True)
    File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/req/req_install.py", line 754, in uninstall
      paths_to_remove.remove(auto_confirm)
    File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/req/req_uninstall.py", line 115, in remove
      renames(path, new_path)
    File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/utils/__init__.py", line 267, in renames
      shutil.move(old, new)
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 302, in move
      copy2(src, real_dst)
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 131, in copy2
      copystat(src, dst)
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 103, in copystat
      os.chflags(dst, st.st_flags)
  OSError: [Errno 1] Operation not permitted: '/var/folders/26/d0_xn9hx26g4_nl84j40qp8c0000gn/T/pip-cLBEyu-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/six-1.4.1-py2.7.egg-info'
  </code></pre>