diff --git a/nhentai/constant.py b/nhentai/constant.py
index 680fef6..c5c9092 100644
--- a/nhentai/constant.py
+++ b/nhentai/constant.py
@@ -4,9 +4,8 @@ import tempfile
 
 from urllib.parse import urlparse
 
-BASE_URL = os.getenv('NHENTAI', 'https://nhentai.net')
 
-__api_suspended_DETAIL_URL = f'{BASE_URL}/api/gallery'
+BASE_URL = os.getenv('NHENTAI', 'https://nhentai.net')
 
 DETAIL_URL = f'{BASE_URL}/g'
 LEGACY_SEARCH_URL = f'{BASE_URL}/search/'
@@ -17,13 +16,14 @@ LOGIN_URL = f'{BASE_URL}/login/'
 CHALLENGE_URL = f'{BASE_URL}/challenge'
 FAV_URL = f'{BASE_URL}/favorites/'
 
-u = urlparse(BASE_URL)
-IMAGE_URL = f'{u.scheme}://i.{u.hostname}/galleries'
+IMAGE_URL = f'{urlparse(BASE_URL).scheme}://i.{urlparse(BASE_URL).hostname}/galleries'
 
 NHENTAI_HOME = os.path.join(os.getenv('HOME', tempfile.gettempdir()), '.nhentai')
 NHENTAI_HISTORY = os.path.join(NHENTAI_HOME, 'history.sqlite3')
 NHENTAI_CONFIG_FILE = os.path.join(NHENTAI_HOME, 'config.json')
 
+__api_suspended_DETAIL_URL = f'{BASE_URL}/api/gallery'
+
 CONFIG = {
     'proxy': {'http': '', 'https': ''},
     'cookie': '',
@@ -32,7 +32,7 @@ CONFIG = {
     'useragent': 'nhentai command line client (https://github.com/RicterZ/nhentai)'
 }
 
-LANGUAGEISO = {
+LANGUAGE_ISO = {
     'english': 'en',
     'chinese': 'zh',
     'japanese': 'ja',
diff --git a/nhentai/serializer.py b/nhentai/serializer.py
index bf5b12e..2cb93cd 100644
--- a/nhentai/serializer.py
+++ b/nhentai/serializer.py
@@ -2,7 +2,7 @@
 import json
 import os
 from xml.sax.saxutils import escape
-from nhentai.constant import LANGUAGEISO
+from nhentai.constant import LANGUAGE_ISO
 
 
 def serialize_json(doujinshi, output_dir):
@@ -67,8 +67,8 @@ def serialize_comic_xml(doujinshi, output_dir):
         if doujinshi.info.languages:
             languages = [i.strip() for i in doujinshi.info.languages.split(',')]
             xml_write_simple_tag(f, 'Translated', 'Yes' if 'translated' in languages else 'No')
-            [xml_write_simple_tag(f, 'LanguageISO', LANGUAGEISO[i]) for i in languages
-                if (i != 'translated' and i in LANGUAGEISO)]
+            [xml_write_simple_tag(f, 'LanguageISO', LANGUAGE_ISO[i]) for i in languages
+             if (i != 'translated' and i in LANGUAGE_ISO)]
 
         f.write('</ComicInfo>')