diff --git a/misp_modules/lib/cof2misp/cof.py b/misp_modules/lib/cof2misp/cof.py
index 97c23a5..a741123 100644
--- a/misp_modules/lib/cof2misp/cof.py
+++ b/misp_modules/lib/cof2misp/cof.py
@@ -89,8 +89,8 @@ if __name__ == "__main__":
 {"count":2560,"rdata":["cpab.circl.lu"],"rrname":"www.circl.lu","rrtype":"CNAME","time_first":"1449584660","time_last":"1617676151"}"""
 
     i = 0
-    for l in ndjson.loads(mock_input):
-        retval = validate_cof(l, strict=False)
+    for entry in ndjson.loads(mock_input):
+        retval = validate_cof(entry, strict=False)
         assert retval
         print("line %d is valid: %s" % (i, retval))
         i += 1
diff --git a/misp_modules/modules/import_mod/cof2misp.py b/misp_modules/modules/import_mod/cof2misp.py
index 6b9c69f..b1c5e96 100755
--- a/misp_modules/modules/import_mod/cof2misp.py
+++ b/misp_modules/modules/import_mod/cof2misp.py
@@ -9,10 +9,11 @@ License: see LICENSE
 
 """
 
+import sys
 import json
 import base64
 
-import pprint
+
 import ndjson
 
 # from pymisp import MISPObject, MISPEvent, PyMISP
@@ -59,22 +60,22 @@ def parse_and_insert_cof(data: str) -> dict:
     objects = []
     try:
         entries = ndjson.loads(data)
-        for l in entries:           # iterate over all ndjson lines
+        for entry in entries:           # iterate over all ndjson lines
 
             # validate here (simple validation or full JSON Schema validation)
-            if not validate_cof(l):
-                return {"error": "Could not validate the COF input '%r'" % l}
+            if not validate_cof(entry):
+                return {"error": "Could not validate the COF input '%r'" % entry}
 
             # Next, extract some fields
-            rrtype = l['rrtype'].upper()
-            rrname = l['rrname'].rstrip('.')
-            rdata = [x.rstrip('.') for x in l['rdata']]
+            rrtype = entry['rrtype'].upper()
+            rrname = entry['rrname'].rstrip('.')
+            rdata = [x.rstrip('.') for x in entry['rdata']]
 
             # create a new MISP object, based on the passive-dns object for each nd-JSON line
             o = MISPObject(name='passive-dns', standalone=False, comment='created by cof2misp')
 
             # o.add_tag('tlp:amber')                                    # FIXME: we'll want to add a tlp: tag to the object
-            o.add_attribute('bailiwick', value=l['bailiwick'].rstrip('.'))
+            o.add_attribute('bailiwick', value=entry['bailiwick'].rstrip('.'))
 
             #
             # handle the combinations of rrtype (domain, ip) on both left and right side
@@ -100,17 +101,17 @@ def parse_and_insert_cof(data: str) -> dict:
             for r in rdata:
                 o.add_attribute('rdata', value=r)
             o.add_attribute('raw_rdata', value=json.dumps(rdata))       # FIXME: do we need to hex encode it?
-            o.add_attribute('time_first', value=l['time_first'])
-            o.add_attribute('time_last', value=l['time_last'])
-            o.first_seen = l['time_first']      # is this redundant?
-            o.last_seen = l['time_last']
+            o.add_attribute('time_first', value=entry['time_first'])
+            o.add_attribute('time_last', value=entry['time_last'])
+            o.first_seen = entry['time_first']      # is this redundant?
+            o.last_seen = entry['time_last']
 
             #
             # Now add the other optional values.                        # FIXME: how about a map() other function. DNRY
             #
             for k in ['count', 'sensor_id', 'origin', 'text', 'time_first_ms', 'time_last_ms', 'zone_time_first', 'zone_time_last']:
-                if k in l and l[k]:
-                    o.add_attribute(k, value=l[k])
+                if k in entry and entry[k]:
+                    o.add_attribute(k, value=entry[k])
 
             #
             # add COF entry to MISP object
@@ -164,7 +165,8 @@ def is_dnsdbflex(data: str) -> bool:
             if not set(l.keys()) == {'rrname', 'rrtype'}:
                 return False            # shortcut
         return True
-    except Exception as _ex:
+    except Exception as ex:
+        print("oops, this should not have happened. Maybe not an ndjson file?", file=sys.sterr)
         return False
 
 
@@ -183,7 +185,7 @@ def handler(q=False):
     # push to MISP
     event_id = request['event_id']
     # event = misp.get_event(event_id)
-    pprint.pprint("event_id = %s" % event_id)
+    print("event_id = %s" % event_id, file=sys.stderr)
     try:
         data = base64.b64decode(request["data"]).decode('utf-8')
         if not data:
@@ -197,7 +199,7 @@ def handler(q=False):
         else:
             return {'error': 'Could not find any valid COF input nor dnsdbflex input. Please have a loot at: https://datatracker.ietf.org/doc/draft-dulaunoy-dnsop-passive-dns-cof/'}
     except Exception as ex:
-        print("oops, got exception %s" % str(ex))
+        print("oops, got exception %s" % str(ex), file=sys.stderr)
         return {'error': "Got exception %s" % str(ex)}