Created
May 11, 2019 16:03
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| def _insert_in_metadata_fits_safe(meta, key, value): | |
| """Helper function to insert key-value pair into metadata in a way that | |
| FITS can serialize | |
| Parameters | |
| ---------- | |
| key : str | |
| Key to be inserted in the dictionary | |
| value : str or None | |
| Value to be inserted | |
| Notes | |
| ----- | |
| This addresses a shortcoming of the FITS standard. There are length | |
| restrictions on both the ``key`` (8 characters) and ``value`` (72 | |
| characters) in the FITS standard. There is a convention for handling | |
| long keywords and a convention for handling long values, but the | |
| two conventions cannot be used at the same time. | |
| This addresses that case by checking the length of the ``key`` and | |
| ``value`` and, if necessary, shortening the key. | |
| Reference | |
| --------- | |
| This helper method is taken from `astropy.nddata.cddata`. Not imported | |
| as this is a private method, subject to change | |
| """ | |
| if len(key) > 8 and len(value) > 72: | |
| short_name = key[:8] | |
| meta['HIERARCH {0}'.format(key.upper())] = (short_name, "Shortened name for {}".format(key)) | |
| meta[short_name] = value | |
| else: | |
| meta[key] = value |
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