title: pyenv does not use correct python version
body: <p>using pyenv 2.0.3</p>
  <p>when i'm in a folder with a python-version file, the python keeps using the system version which is 2.7.6. (not sure why it is 2.7.6 since i install 3.9.7 via brew).</p>
  <pre><code>$ python -V
  Python 2.7.16
  </code></pre>
  <p>looking via pyenv gives</p>
  <pre><code>$ pyenv which python
  /Users/jaco/.pyenv/versions/trading/bin/python
  </code></pre>
  <p>Activating it already says it is activated.</p>
  <p>i have</p>
  <pre><code># pyenv
  export PYENV_ROOT=&quot;$HOME/.pyenv&quot;
  export PATH=&quot;$PYENV_ROOT/bin:$PATH&quot;
  eval &quot;$(pyenv init -)&quot;
  eval &quot;$(pyenv virtualenv-init -)&quot;
  </code></pre>
  <p>in my zshrc</p>
  <p>also don't seem to have the bin folder of pyenv? is this new on the v2?</p>
  <pre><code>$ l /Users/jaco/.pyenv/bin
  ls: /Users/jaco/.pyenv/bin: No such file or directory
  </code></pre>
  <p>Also setting <code>pyenv global 3.9.1</code> does not work, it keeps 2.7</p>