def command(cmd, label, env={}):
    """Create a Benchpress command, which define a single benchmark execution

    This is a help function to create a Benchpress command, which is a Python `dict` of the parameters given.

    Parameters
    ----------
    cmd : str
        The bash string that makes up the command
    label : str
        The human readable label of the command
    env : dict
        The Python dictionary of environment variables to define before execution'
        
    Returns
    -------
    command : dict
        The created Benchpress command        
    """
    return {'cmd': cmd,
            'label': label,
            'env': env}