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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_current_venv():
 """ Returns the path to the current virtualenv """

        if 'VIRTUAL_ENV' in os.environ:
            venv = os.environ['VIRTUAL_ENV']
        elif os.path.exists('.python-version'):  # pragma: no cover
            try:
                subprocess.check_output(['pyenv', 'help'], stderr=subprocess.STDOUT)
            except OSError:
                print("This directory seems to have pyenv's local venv, "
                      "but pyenv executable was not found.")
            with open('.python-version', 'r') as f:
                # minor fix in how .python-version is read
                # Related: https://github.com/Miserlou/Zappa/issues/921
                env_name = f.readline().strip()
            bin_path = subprocess.check_output(['pyenv', 'which', 'python']).decode('utf-8')
            venv = bin_path[:bin_path.rfind(env_name)] + env_name
        else:  # pragma: no cover
            return None
        return venv