[Python] Pyenv doesn't change the Python version when doing 'pyenv global 3.7.2'

I'm using Ubuntu 16.04 (Xenial Xerus).

I installed dependencies for pyvenv and pyenv, by:

su sudo apt-get install -y make build-essential libssl-dev zlib1g-dev libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev libncursesw5-dev xz-utils tk-dev git python-pip


export PYENV_ROOT="$HOME/.pyenv"
export PATH="$PYENV_ROOT/bin:$PATH"
eval "$(pyenv init -)"


in file ~/.bashrc.

And I ran

source ~/.bashrc


Run the

pyenv install 3.7.2
pyenv global 3.7.2


And pyenv versions shows:

system
* 3.7.2 (set by PYENV_VERSION environment variable)


But python -V shows just the same as my system Python.

Python 3.5.2


What did I do wrong?

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