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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 read_crtf(filename, errors='strict'):
 """ Reads a CRTF region file and returns a list of region objects. Parameters filename : `str` The file path errors : ``warn``, ``ignore``, ``strict``, optional The error handling scheme to use for handling parsing errors. The default is 'strict', which will raise a `~regions.CRTFRegionParserError`. ``warn`` will raise a `~regions.CRTFRegionParserWarning`, and ``ignore`` will do nothing (i.e., be silent). Returns ------- regions : `list` Python `list` of `~regions.Region` objects. Examples -------- Region: CircleSkyRegion center: <SkyCoord (FK4: equinox=B1950.000, obstime=B1950.000):
 (ra, dec) in deg (273.1, -23.18333333)> radius: 2.3 arcsec {'frame': 'BARY', 'corr': ['I', 'Q'], 'include': True, 'type': 'ann'} {'color': 'blue'} """

    with open(filename) as fh:
        if regex_begin.search(fh.readline()):
            region_string = fh.read()
            parser = CRTFParser(region_string, errors)
            return parser.shapes.to_regions()
        else:
            raise CRTFRegionParserError('Every CRTF Region must start with "#CRTF" ')