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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 system_types():
    '''
    List the system types that are supported by the installed version of sfdisk

    CLI Example:

    .. code-block:: bash

        salt '*' partition.system_types
    '''
    ret = {}
    for line in __salt__['cmd.run']('sfdisk -T').splitlines():
        if not line:
            continue
        if line.startswith('Id'):
            continue
        comps = line.strip().split()
        ret[comps[0]] = comps[1]
    return ret