improved writing to file

src/mwfin/__main__.py

@@ -1,40 +1,40 @@
 import asyncio
-import sys
 import csv
 import json
 from argparse import ArgumentParser
 from pathlib import Path
+from typing import Dict
 
 from aiohttp import ClientSession
 
-from . import get_company_financials
+from .functions import get_company_financials, ResultDict, log
+from .constants import END_DATE
 
 
 JSON_EXT, CSV_EXT = '.json', '.csv'
 
 
-def write_to_csv(data, file_obj) -> None:
+def write_to_csv(data: Dict[str, ResultDict], file_obj) -> None:
     writer = csv.writer(file_obj)
-    for statement in data.values():
+    for statement_key, statement_dict in data.items():
-        for key, values in statement.items():
+        end_dates = statement_dict.pop(END_DATE)
-            writer.writerow([key] + list(values))
+        writer.writerow([statement_key] + list(end_dates))
+        for key, values in statement_dict.items():
+            writer.writerow([key] + list(str(val) for val in values))
 
 
 async def main() -> None:
     parser = ArgumentParser(description="Scrape company financials")
-
     parser.add_argument(
-        '-s', '--symbol',
+        'symbol',
         type=str,
         help="Stock ticker symbol of the company to be scraped the financials of"
     )
-
     parser.add_argument(
         '-f', '--to-file',
         type=Path,
         help="Writes results to the specified destination file. If omitted results are printed to stdout."
     )
-
     args = parser.parse_args()
     session = ClientSession()
     try:
@@ -45,14 +45,13 @@ async def main() -> None:
     if path is None:
         print(json.dumps(data, indent=2))
         return
-    if path.suffix.lower() == JSON_EXT:
-        with open(path, 'w') as f:
-            json.dump(data, f, indent=2)
-    elif path.suffix.lower() == CSV_EXT:
     with open(path, 'w') as f:
+        if path.suffix.lower() == CSV_EXT:
             write_to_csv(data, f)
-    else:
+            return
-        print('unknown extension')
+        if not path.suffix.lower() == JSON_EXT:
+            log.warning(f"Extension '{path.suffix}' unknown; using JSON format")
+        json.dump(data, f, indent=2)
 
 
 if __name__ == '__main__':

src/mwfin/constants.py

@@ -1,8 +1,10 @@
+LOGGER_NAME = 'mwfin'
+
 HTML_PARSER = 'html.parser'
 DOMAIN = 'www.marketwatch.com'
 BASE_URL = f'https://{DOMAIN}/investing/stock'
 
-BS, IS, CF = 'bs', 'is', 'cf'
+BS, IS, CF = 'Balance Sheet', 'Income Statement', 'Cash Flow Statement'
 FIN_STMT_URL_SUFFIX = {
     BS: '/balance-sheet',
     IS: '',

src/mwfin/functions.py

@@ -8,7 +8,7 @@ from bs4.element import Tag
 from . import constants
 
 
-log = logging.getLogger(__name__)
+log = logging.getLogger(constants.LOGGER_NAME)
 
 # The resulting dictionary's keys correspond to the name of the item (row) in the financial statement,
 # while its values will always be tuples with a length corresponding to the number of periods (columns)