generalized loop for n exposures

Author: penaguerrero

CHANGES.rst

@@ -37,8 +37,8 @@ resample
   image shape and the bounding box both for ``SCI`` image as well as for the
   ``ERR`` and ``VARIANCE_*`` images. [#7774]
 
-- Update the following exposure time keywords according to JWST Keyword dictionary
-  equations: XPOSURE (EFFEXPTM), EFFINTTM, DURATION and TELAPSE. [#7793]
+- Update the following exposure time keywords: XPOSURE (EFFEXPTM), EFFINTTM,
+  DURATION and TELAPSE. [#7793]
 
 
 1.11.3 (2023-07-17)

jwst/resample/resample.py

@@ -365,11 +365,12 @@ def update_exposure_times(self, output_model):
         exposure_times = {'start': [], 'end': []}
         effinttm, duration = 0.0, 0.0
         for exposure in self.input_models.models_grouped:
-            total_exposure_time += exposure[0].meta.exposure.exposure_time
-            exposure_times['start'].append(exposure[0].meta.exposure.start_time)
-            exposure_times['end'].append(exposure[0].meta.exposure.end_time)
-            effinttm += exposure[0].meta.exposure.integration_time
-            duration += exposure[0].meta.exposure.duration
+            for n, _ in enumerate(exposure):
+                total_exposure_time += exposure[n].meta.exposure.exposure_time
+                exposure_times['start'].append(exposure[n].meta.exposure.start_time)
+                exposure_times['end'].append(exposure[n].meta.exposure.end_time)
+                effinttm += exposure[n].meta.exposure.integration_time
+                duration += exposure[n].meta.exposure.duration
 
         # Update some basic exposure time values based on output_model
         output_model.meta.exposure.exposure_time = total_exposure_time