diff --git a/reldi_tokeniser/tokeniser.py b/reldi_tokeniser/tokeniser.py
index ca1f3ce..113c93e 100755
--- a/reldi_tokeniser/tokeniser.py
+++ b/reldi_tokeniser/tokeniser.py
@@ -13,11 +13,12 @@
 reldir=os.path.dirname(os.path.abspath(__file__))
 
 def read_abbrevs(file):
-  abbrevs={'B':[],'N':[],'S':[]}
-  for line in open(os.path.join(reldir,file),encoding='utf8'):
-    if not line.startswith('#'):
-      abbrev,type=line.strip().split('\t')[:2]
-      abbrevs[type].append(abbrev)
+  abbrevs={'B':[], 'N':[], 'S':[]}
+  with open(os.path.join(reldir, file), encoding='utf8') as file:
+    for line in file:
+      if not line.startswith('#'):
+        abbrev, type = line.strip().split('\t')[:2]
+        abbrevs[type].append(abbrev)
   return abbrevs
 
 abbrevs={
@@ -34,7 +35,8 @@ def read_abbrevs(file):
 url=r'https?://[-\w/%]+(?:[.#?=&@;][-\w/%]+)+|\b[\w-]+\.(?:[\w-]+\.)?(?:com|org|net|gov|edu|int|io|eu|si|hr|rs|ba|me|mk|it|at|hu|bg|ro|al|de|ch|be|dk|se|no|es|pt|ie|fr|fi|cl|co|bo|br|gr|ru|uk|us|by|cz|sk|pl|lt|lv|lu|ca|in|tr|il|iq|ir|hk|cn|jp|au|nz)/?\b'
 word=r'(?:[*]{2,})?\w+(?:[@­\'-]\w+|[*]+\w+)*(?:[*]{2,})?'
 #open('punct','w').write(''.join([chr(i) for i in range(sys.maxunicode) if unicodedata.category(chr(i)).startswith('P')]))
-punct = open(os.path.join(reldir,'punct'), encoding="utf-8").read()
+with open(os.path.join(reldir,'punct'), encoding="utf-8") as punct_file:
+  punct = punct_file.read()
 
 langs={
   'hr':{