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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_env_bin_path(env_path):
 """Return the bin path for a virtualenv This provides a fallback for a situation in which you're trying to use the script and create a virtualenv from within a virtualenv in which virtualenv isn't installed and so is not importable. """

    if IS_VIRTUALENV_INSTALLED:
        path = virtualenv.path_locations(env_path)[3]
    else:
        path = os.path.join(env_path, 'Scripts' if IS_WIN else 'bin')
    return r'{0}'.format(path)