title: How to stop my terminal from defaulting to old Python 2.7.10 to install Pyperclip?
body: <p>I'm trying to install <code>Pyperclip</code> with <code>Pip</code> but I get a warning saying "Python 2.7 will reach the end of its life on January 1st, 2020." and tells me to upgrade. Following that I get a bunch of errors with the install.</p>
  
  <p>I have Python 2.7.10 and 3.7.3 installed on my system.</p>
  
  <p>When I launch <code>pip install pyperclip</code> I get the error :</p>
  
  <pre><code>DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7.
  Collecting pyperclip
    Using cached https://files.pythonhosted.org/packages/2d/0f/4eda562dffd085945d57c2d9a5da745cfb5228c02bc90f2c74bbac746243/pyperclip-1.7.0.tar.gz
  Installing collected packages: pyperclip
    Running setup.py install for pyperclip ... error
      ERROR: Complete output from command /usr/bin/python -u -c 'import setuptools, tokenize;__file__='"'"'/private/var/folders/b5/yshbmh_d1352tytvt1r95hwr0000gn/T/pip-install-EKTm69/pyperclip/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /private/var/folders/b5/yshbmh_d1352tytvt1r95hwr0000gn/T/pip-record-ntOrdw/install-record.txt --single-version-externally-managed --compile:
      ERROR: running install
      running build
      running build_py
      creating build
      creating build/lib
      creating build/lib/pyperclip
      copying src/pyperclip/__init__.py -&gt; build/lib/pyperclip
      copying src/pyperclip/__main__.py -&gt; build/lib/pyperclip
      running install_lib
      creating /Library/Python/2.7/site-packages/pyperclip
      error: could not create '/Library/Python/2.7/site-packages/pyperclip': Permission denied
      ----------------------------------------
  ERROR: Command "/usr/bin/python -u -c 'import setuptools, tokenize;__file__='"'"'/private/var/folders/b5/yshbmh_d1352tytvt1r95hwr0000gn/T/pip-install-EKTm69/pyperclip/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /private/var/folders/b5/yshbmh_d1352tytvt1r95hwr0000gn/T/pip-record-ntOrdw/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /private/var/folders/b5/yshbmh_d1352tytvt1r95hwr0000gn/T/pip-install-EKTm69/pyperclip/
  </code></pre>
  
  <p>I expect Pyperclip to install properly.</p>