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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 parse_yaml_config(args):
 """Parse yaml config"""

    try:
        import yaml
    except ImportError:
        yaml = None

    yml = {}
    try:
        with open(args.coveralls_yaml, 'r') as fp:
            if not yaml:
                raise SystemExit('PyYAML is required for parsing configuration')
            yml = yaml.load(fp)
    except IOError:
        pass
    yml = yml or {}
    return yml