diff --git a/rad_tag.py b/rad_tag.py
index d2d7db7..7159dea 100755
--- a/rad_tag.py
+++ b/rad_tag.py
@@ -14,7 +14,7 @@ import argparse
 import pytz
 import pyexiv2
 import gpxpy
-from functions import Radiation, Position
+from functions import Radiation
 
 # SIFACTOR for GQ Geiger counters
 
@@ -53,54 +53,52 @@ args = parser.parse_args()
 local_timezone = pytz.timezone(args.timezone)
 
 # Inform the user about what is going to happen
-if args.dry is not None:
+if args.dry is True:
+    print('Not modifying anything. Just print what would happen without --dry')
+else:
     if args.outdir == ".":
         print('Modifying photos in place (overwrite)')
     else:
         print('Modifying photos in', str(args.outdir), '(copy)')
-else:
-    print('Not modifying anything. Just print what would happen without --dry')
 
-# Print table header
-print('{:<15} {:<25} {:<22}'.format('filename', 'date / time', 'Exif UserComment'))
-
-for srcphoto in args.photos:
+for src_photo in args.photos:
     # Get image file name out of path
-    photo_basename = os.path.basename(srcphoto)
+    photo_basename = os.path.basename(src_photo)
 
     # Decide whether to modify photo in place or to copy it to outdir first
     # Then set the destination file as 'photo' to work on
     if args.outdir == ".":
-        photo = srcphoto
+        photo = src_photo
     else:
         # be os aware and use the correct directory delimiter for destfile
-        dstphoto = os.path.join(args.outdir, photo_basename)
+        dst_photo = os.path.join(args.outdir, photo_basename)
         # Don't copy image if in dry-run mode
         if args.dry == 'True':
-            shutil.copy(srcphoto, dstphoto)
-            photo = dstphoto
+            shutil.copy(src_photo, dst_photo)
+            photo = dst_photo
         else:
-            photo = srcphoto
+            photo = src_photo
 
     # Load Exif data from image
     metadata = pyexiv2.ImageMetadata(photo)
     metadata.read()
     tag = metadata['Exif.Photo.DateTimeOriginal']
     # tag.value creates datetime object in pictime
-    picnaivetime = tag.value
+    pic_naive_time = tag.value
     # Set timezone
-    pictime = picnaivetime.astimezone(local_timezone)
+    pic_time = pic_naive_time.astimezone(local_timezone)
 
+    # Initialize two empty lists for comparison
     radiation_list = []
     position_list = []
 
     # Import GeigerCounter log
     with open(args.csv, "r") as f:
-        csvreader = csv.reader(filter(lambda row: row[0] != '#', f), 
-                               delimiter=',', skipinitialspace=True)
+        csv_reader = csv.reader(filter(lambda row: row[0] != '#', f), 
+                                delimiter=',', skipinitialspace=True)
 
-        for _, csvrawtime, csvrawcpm, _ in csvreader:
-            radiation = Radiation(csvrawtime, csvrawcpm, local_timezone, args.sifactor)
+        for _, csv_raw_time, csv_raw_cpm, _ in csv_reader:
+            radiation = Radiation(csv_raw_time, csv_raw_cpm, local_timezone, args.sifactor)
             radiation_list.append(radiation)
             #print(radiation_list)
 
@@ -110,13 +108,15 @@ for srcphoto in args.photos:
     # Import GPX track(s)
     if args.gpx is not None:
         gpx_file = open(args.gpx, 'r')
-        gpxreader = gpxpy.parse(gpx_file)
+        gpx_reader = gpxpy.parse(gpx_file)
 
-        for waypoint in gpxreader.waypoints:
-            for track in gpxreader.tracks:
+        for waypoint in gpx_reader.waypoints:
+            for track in gpx_reader.tracks:
                 for segment in track.segments:
                     for point in segment.points:
                         position = [point.time, point.latitude, point.longitude]
                         position_list.append(position)
                         #print(position_list)
 
+# Print table header
+print('{:<15} {:<25} {:<22}'.format('filename', 'date / time', 'Exif UserComment'))