def text_write(spec: Spectrum, path: str, filename: str) -> None:
"""
Writes an ASCII formatted spec file with appropriate header information.
Format can be read in by spec_load_write.text_load() method
:param spec: spectrum to be written
:param path: /path/to/write/
:param filename: filename to write in path
:type spec: Spectrum
:type path: str
:type filename: str
:return: None
:rtype: None
"""
dirCheck(path)
with open(join(path, filename), 'w') as outfile:
header = "namestring=%s,z=%f,gmag=%f%s" % (spec.getNS(), spec.getRS(),
spec.getGmag(), os.linesep)
outfile.writelines(header)
fieldnames = ["wavelength", "flux density", "error"]
writer = DictWriter(outfile, fieldnames=fieldnames)
writer.writeheader()
writer.writerows(spec.lineDictList())
