Added fromfile feature for hdulists

README.md

@@ -158,6 +158,23 @@ fsspec_HDUList.writeto(hdul_img, out_combined_img, overwrite=True)
 fsspec_HDUList.writeto(hdul_img, out_combined_img, s3_options=s3_options, overwrite=True)
 ```
 
+
+### HDUList.fromfile
+#### 老写法
+```python
+hdul_img = fits.HDUList.fromfile("hdulist.fits")
+```
+usage reference:
+[https://docs.astropy.org/en/stable/io/fits/api/hdulists.html#astropy.io.fits.HDUList.fromfile](https://docs.astropy.org/en/stable/io/fits/api/hdulists.html#astropy.io.fits.HDUList.fromfile)
+
+#### 新写法
+ ```python
+from csst_fs import fsspec_HDUList
+hdul_img = fsspec_HDUList.fromfile("hdulist.fits")
+hdul_img = fsspec_HDUList.fromfile("hdulist.fits", cache=False, s3_options=s3_options)
+```
+
+
 ### table.Table.read
 #### 老写法
 ```python

csst_fs/fits/fsspec_HDUList.py

 import fsspec
+from astropy.io import fits
 from ..fsspec_fileobj import open_fileobj
 from ..s3_config import load_s3_options
 
-def writeto(fits_HDUList, out_path, s3_options=load_s3_options(), *args, **kwargs):
+def writeto(fits_HDUList, out_path, *args, s3_options=load_s3_options(), **kwargs):
     fileobj = open_fileobj(out_path, s3_options, mode='wb')
     fits_HDUList.writeto(fileobj, *args, **kwargs)
     if hasattr(fileobj, 'close'):
         fileobj.close()
+
+def fromfile(filename, *args, s3_options=load_s3_options(), **kwargs):
+    fileobj = open_fileobj(filename, s3_options, mode='rb')
+    return fits.HDUList.fromfile(fileobj, *args, **kwargs)
     
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