✨ use os.path.join() instead of string concatenation to join paths

This change should make the program compatible with other operating systems.

main.py

@@ -9,14 +9,16 @@ from models import TazDownloader, TazConfiguration
 from exceptions import TazConfigurationError, TazDownloadError, TazDownloadFormatException
 
 # Get directory
-dir_path = os.path.dirname(os.path.realpath(__file__)) + '/'
+dir_path = os.path.dirname(os.path.realpath(__file__))
 
 
 def main(config: dict):
-
     # Get german date for tomorrow
     tomorrow = (datetime.now(pytz.timezone('Europe/Berlin')) + timedelta(1)).strftime('%Y_%m_%d')
 
+    # Define tmp/ folder
+    tmp_folder = os.path.join(dir_path, 'tmp')
+
     # Set log level
     try:
         logging.getLogger().setLevel(config['log_level'].upper())
@@ -25,7 +27,7 @@ def main(config: dict):
 
     # Read download history from csv file
     try:
-        df = pd.read_csv(dir_path + 'download_history.csv', header=0)
+        df = pd.read_csv(os.path.join(dir_path, 'download_history.csv'), header=0)
     except FileNotFoundError:
         # In case, there isn't yet a csv file, create data frame with headers
         df = pd.DataFrame(
@@ -69,7 +71,7 @@ def main(config: dict):
     newspaper_downloaded = []
     for n in newspaper_to_download:
         try:
-            if taz_dl.download_newspaper(n):
+            if taz_dl.download_newspaper(n, tmp_folder):
                 newspaper_downloaded.append(n)
         except Exception as e:
             logging.error(f"Could not download {n}\n{e}", exc_info=True)
@@ -85,17 +87,19 @@ def main(config: dict):
             )
             df = df.append(df_tmp, ignore_index=True)
         df.sort_values(by='file', ascending=False, inplace=True)
-        df.to_csv(dir_path + 'download_history.csv', index=False)
+        df.to_csv(os.path.join(dir_path, 'download_history.csv'), index=False)
     except Exception as e:
         logging.error(f"Could not update download_history.csv\n{e}", exc_info=True)
 
     # Move downloaded file to download folder
     if os.path.isdir(config['download_folder']):
         download_folder = \
-            config['download_folder'] if config['download_folder'].endswith('/') else config['download_folder'] + "/"
+            config['download_folder'] \
+            if config['download_folder'].endswith(os.path.sep) \
+            else config['download_folder'] + os.path.sep
         for n in newspaper_downloaded:
             try:
-                shutil.move(dir_path + 'tmp/' + n, download_folder)
+                shutil.move(os.path.join(tmp_folder, n), download_folder)
             except Exception as e:
                 logging.error(f"Could not move file to download folder \"{download_folder}\"\n{e}", exc_info=True)
 
@@ -104,7 +108,7 @@ if __name__ == '__main__':
 
     # Set up logging
     logging.basicConfig(
-        filename=dir_path + 'tazPlease.log',
+        filename=os.path.join(dir_path, 'tazPlease.log'),
         level=logging.ERROR,
         format='%(asctime)s - %(message)s'
     )

models.py

@@ -7,7 +7,7 @@ from bs4 import BeautifulSoup
 from envyaml import EnvYAML
 import argparse
 
-dir_path = os.path.dirname(os.path.realpath(__file__)) + '/'
+dir_path = os.path.dirname(os.path.realpath(__file__))
 
 
 class TazConfiguration:
@@ -43,7 +43,7 @@ class TazConfiguration:
     def _load_config(self):
         # Try to load config.yaml
         try:
-            conf_yaml = EnvYAML(dir_path + 'config.yaml', dir_path + '.env')
+            conf_yaml = EnvYAML(os.path.join(dir_path, 'config.yaml'), os.path.join(dir_path, '.env'))
         except Exception as e:
             raise Exception(f"Something went wrong when reading config.yaml.\n{e}")
 
@@ -141,17 +141,17 @@ class TazDownloader:
         except HTTPError as http_e:
             raise TazDownloadError(f"Could not scrape available newspaper editions:\n{http_e}")
 
-    def download_newspaper(self, taz: str, download_folder: str = dir_path + 'tmp/'):
+    def download_newspaper(self, taz: str, download_folder: str = os.path.join(dir_path, 'tmp')):
         """
-        Downloads a newspaper from dl.taz.de and stores it in tmp/
+        Downloads a newspaper from dl.taz.de and stores it in tmp folder
         """
 
         # Check if folder exists
         try:
-            if not os.path.isdir(dir_path):
+            if not os.path.isdir(download_folder):
-                os.mkdirs(dir_path)
+                os.makedirs(download_folder)
         except Exception as e:
-            raise TazDownloadError(f"Could find or create \"{dir_path}\":\n{e}")
+            raise TazDownloadError(f"Could find or create \"{download_folder}\":\n{e}")
 
         # download taz
         try:
@@ -167,7 +167,7 @@ class TazDownloader:
                     }
             ) as r:
                 # write response to file
-                with open(download_folder + taz, "wb") as f:
+                with open(os.path.join(download_folder, taz), "wb") as f:
                     for chunk in r.iter_content(chunk_size=8192):
                         f.write(chunk)
             return True