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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 pretty_memory_info():
    '''
    Pretty format memory info.

    Returns
    -------
    str
        Memory info.

    Examples
    --------
    >>> pretty_memory_info()
    '5MB memory usage'
    '''
    process = psutil.Process(os.getpid())
    return '{}MB memory usage'.format(int(process.memory_info().rss / 2**20))