concurrency for getting all three financial statements; improved imports; renamed functions

src/mwfin/__init__.py

@@ -1 +1 @@
-from .functions import get_company_financials
+from .functions import get_balance_sheet, get_income_statement, get_cash_flow_statement, get_all_financials

src/mwfin/__main__.py

@@ -6,7 +6,7 @@ from argparse import ArgumentParser
 from pathlib import Path
 from typing import Dict
 
-from .functions import get_company_financials, ResultDict
+from .functions import get_all_financials, ResultDict
 from .constants import END_DATE, MAIN_LOGGER_NAME
 
 
@@ -78,7 +78,7 @@ def write_to_csv(data: Dict[str, ResultDict], file_obj) -> None:
 async def main() -> None:
     args = parse_cli()
     configure_logging(args[VERBOSE])
-    data = await get_company_financials(args[TICKER_SYMBOL], quarterly=args[QUARTERLY])
+    data = await get_all_financials(args[TICKER_SYMBOL], quarterly=args[QUARTERLY])
     path: Path = args[TO_FILE]
     if path is None:
         print(json.dumps(data, indent=args[JSON_INDENT]))

src/mwfin/constants.py

@@ -15,7 +15,7 @@ END_DATE = 'End Date'
 
 # All items marked `False` do not need to be scraped
 # because they are calculated from other items (e.g. growth or ratios).
-FINANCIAL_STATEMENT_ITEMS = {
+FIN_STMT_ITEMS = {
     #################
     # Balance Sheet #
     #################

src/mwfin/functions.py

@@ -1,4 +1,5 @@
 import logging
+import asyncio
 from typing import Union, List, Dict
 
 from aiohttp.client import ClientSession
@@ -6,7 +7,8 @@ from bs4 import BeautifulSoup
 from bs4.element import Tag
 from webutils import in_async_session, gather_in_batches
 
-from . import constants
+from .constants import (HTML_PARSER, BASE_URL, END_DATE, BS, IS, CF, FIN_STMT_URL_SUFFIX, FIN_STMT_ITEMS,
+                        DEFAULT_CONCURRENT_BATCH_SIZE)
 
 
 log = logging.getLogger(__name__)
@@ -25,7 +27,7 @@ async def soup_from_url(url: str, session: ClientSession = None) -> BeautifulSou
     """
     async with session.get(url) as response:
         html = await response.text()
-    return BeautifulSoup(html, constants.HTML_PARSER)
+    return BeautifulSoup(html, HTML_PARSER)
 
 
 def extract_end_dates(soup: BeautifulSoup) -> tuple[str]:
@@ -43,7 +45,7 @@ def is_relevant_table_row(tr: Tag) -> bool:
     """
     item_name = str(tr.td.div.string).strip()
     try:
-        return constants.FINANCIAL_STATEMENT_ITEMS[item_name]
+        return FIN_STMT_ITEMS[item_name]
     except KeyError:
         log.warning(f"Unknown item name '{item_name}' found in financial statement.")
         return False
@@ -73,7 +75,7 @@ def extract_all_data(soup: BeautifulSoup) -> ResultDict:
     """
     Extracts financials from the page.
     """
-    output = {constants.END_DATE: extract_end_dates(soup)}
+    output = {END_DATE: extract_end_dates(soup)}
     for row in find_relevant_table_rows(soup):
         row_data = extract_row_data(row)
         output[row_data[0]] = row_data[1]
@@ -86,7 +88,7 @@ async def _get_single_company_fin_stmt(statement: str, ticker_symbol: str, quart
     """
     Returns data from the specified financial statement of the specified company.
     """
-    url = f'{constants.BASE_URL}/{ticker_symbol}/financials{constants.FIN_STMT_URL_SUFFIX[statement]}'
+    url = f'{BASE_URL}/{ticker_symbol}/financials{FIN_STMT_URL_SUFFIX[statement]}'
     if quarterly:
         url += '/quarter'
     soup = await soup_from_url(url, session)
@@ -95,70 +97,69 @@ async def _get_single_company_fin_stmt(statement: str, ticker_symbol: str, quart
 
 @in_async_session
 async def _get_multi_companies_fin_stmt(statement: str, *ticker_symbols: str, quarterly: bool = False,
-                                        concurrent_batch_size: int = constants.DEFAULT_CONCURRENT_BATCH_SIZE,
+                                        concurrent_batch_size: int = DEFAULT_CONCURRENT_BATCH_SIZE,
                                         session: ClientSession = None) -> Union[ResultDict, Dict[str, ResultDict]]:
     if len(ticker_symbols) == 1:
         return await _get_single_company_fin_stmt(statement, ticker_symbols[0], quarterly, session)
-    result_list = await gather_in_batches(
+    coroutines = (_get_single_company_fin_stmt(statement, symbol, quarterly, session) for symbol in ticker_symbols)
-        concurrent_batch_size,
+    result_list = await gather_in_batches(concurrent_batch_size, *coroutines)
-        *(_get_single_company_fin_stmt(statement, symbol, quarterly, session) for symbol in ticker_symbols)
-    )
     return {symbol: data for symbol, data in zip(ticker_symbols, result_list)}
 
 
 @in_async_session
 async def get_balance_sheet(*ticker_symbols: str, quarterly: bool = False,
-                            concurrent_batch_size: int = constants.DEFAULT_CONCURRENT_BATCH_SIZE,
+                            concurrent_batch_size: int = DEFAULT_CONCURRENT_BATCH_SIZE,
                             session: ClientSession = None) -> Union[ResultDict, Dict[str, ResultDict]]:
     """
     Returns data from the balance sheet of the specified company.
     """
-    return await _get_multi_companies_fin_stmt(constants.BS, *ticker_symbols,
+    return await _get_multi_companies_fin_stmt(BS, *ticker_symbols,
                                                quarterly=quarterly, concurrent_batch_size=concurrent_batch_size,
                                                session=session)
 
 
 @in_async_session
 async def get_income_statement(*ticker_symbols: str, quarterly: bool = False,
-                               concurrent_batch_size: int = constants.DEFAULT_CONCURRENT_BATCH_SIZE,
+                               concurrent_batch_size: int = DEFAULT_CONCURRENT_BATCH_SIZE,
                                session: ClientSession = None) -> Union[ResultDict, Dict[str, ResultDict]]:
     """
     Returns data from the income statement of the specified company.
     """
-    return await _get_multi_companies_fin_stmt(constants.IS, *ticker_symbols,
+    return await _get_multi_companies_fin_stmt(IS, *ticker_symbols,
                                                quarterly=quarterly, concurrent_batch_size=concurrent_batch_size,
                                                session=session)
 
 
 @in_async_session
 async def get_cash_flow_statement(*ticker_symbols: str, quarterly: bool = False,
-                                  concurrent_batch_size: int = constants.DEFAULT_CONCURRENT_BATCH_SIZE,
+                                  concurrent_batch_size: int = DEFAULT_CONCURRENT_BATCH_SIZE,
                                   session: ClientSession = None) -> Union[ResultDict, Dict[str, ResultDict]]:
     """
     Returns data from the cash flow statement of the specified company.
     """
-    return await _get_multi_companies_fin_stmt(constants.CF, *ticker_symbols,
+    return await _get_multi_companies_fin_stmt(CF, *ticker_symbols,
                                                quarterly=quarterly, concurrent_batch_size=concurrent_batch_size,
                                                session=session)
 
 
 @in_async_session
-async def _get_single_company_financials(ticker_symbol: str, quarterly: bool = False,
+async def _get_single_company_all_financials(ticker_symbol: str, quarterly: bool = False,
                                              session: ClientSession = None) -> Dict[str, ResultDict]:
-    return {
+    coroutines = (_get_single_company_fin_stmt(stmt, ticker_symbol, quarterly, session) for stmt in (BS, IS, CF))
-        constants.BS: await _get_single_company_fin_stmt(constants.BS, ticker_symbol, quarterly, session),
+    results = await asyncio.gather(*coroutines)
-        constants.IS: await _get_single_company_fin_stmt(constants.IS, ticker_symbol, quarterly, session),
+    return {stmt: data for stmt, data in zip((BS, IS, CF), results)}
-        constants.CF: await _get_single_company_fin_stmt(constants.CF, ticker_symbol, quarterly, session)
-    }
 
 
 @in_async_session
-async def get_company_financials(*ticker_symbols: str, quarterly: bool = False,
+async def get_all_financials(*ticker_symbols: str, quarterly: bool = False,
+                             concurrent_batch_size: int = DEFAULT_CONCURRENT_BATCH_SIZE,
                              session: ClientSession = None) -> Union[Dict[str, ResultDict],
                                                                      Dict[str, Dict[str, ResultDict]]]:
     """
     Returns all fundamentals (balance sheet, income statement and cash flow statement) of the specified company.
     """
     if len(ticker_symbols) == 1:
-        return await _get_single_company_financials(ticker_symbols[0], quarterly, session)
+        return await _get_single_company_all_financials(ticker_symbols[0], quarterly, session)
-    return {symbol: await _get_single_company_financials(symbol, quarterly, session) for symbol in ticker_symbols}
+    coroutines = (_get_single_company_all_financials(symbol, quarterly, session) for symbol in ticker_symbols)
+    result_list = await gather_in_batches(concurrent_batch_size, *coroutines)
+    return {symbol: data for symbol, data in zip(ticker_symbols, result_list)}

tests/test_functions.py

@@ -171,11 +171,11 @@ class FunctionsTestCase(IsolatedAsyncioTestCase):
         await self._helper_test_get_any_statement(CF, mock__get_multi_companies_fin_stmt)
 
     @patch.object(functions, '_get_single_company_fin_stmt')
-    async def test__get_single_company_financials(self, mock__get_single_company_fin_stmt):
+    async def test__get_single_company_all_financials(self, mock__get_single_company_fin_stmt):
         symbol, quarterly, mock_session = 'foo', False, MagicMock()
         mock__get_single_company_fin_stmt.return_value = bar = 'bar'
         expected_output = {BS: bar, IS: bar, CF: bar}
-        output = await functions._get_single_company_financials(symbol, quarterly, mock_session)
+        output = await functions._get_single_company_all_financials(symbol, quarterly, mock_session)
         self.assertDictEqual(expected_output, output)
         mock__get_single_company_fin_stmt.assert_has_calls([
             call(BS, symbol, quarterly, mock_session),
@@ -183,21 +183,21 @@ class FunctionsTestCase(IsolatedAsyncioTestCase):
             call(CF, symbol, quarterly, mock_session)
         ])
 
-    @patch.object(functions, '_get_single_company_financials')
+    @patch.object(functions, '_get_single_company_all_financials')
-    async def test_get_company_financials(self, mock__get_single_company_financials):
+    async def test_get_company_financials(self, mock__get_single_company_all_financials):
-        mock__get_single_company_financials.return_value = expected_output = 'baz'
+        mock__get_single_company_all_financials.return_value = expected_output = 'baz'
         symbol, quarterly, mock_session = 'foo', False, MagicMock()
-        output = await functions.get_company_financials(symbol, quarterly=quarterly, session=mock_session)
+        output = await functions.get_all_financials(symbol, quarterly=quarterly, session=mock_session)
         self.assertEqual(expected_output, output)
-        mock__get_single_company_financials.assert_called_once_with(symbol, quarterly, mock_session)
+        mock__get_single_company_all_financials.assert_called_once_with(symbol, quarterly, mock_session)
-        mock__get_single_company_financials.reset_mock()
+        mock__get_single_company_all_financials.reset_mock()
 
         test_sym1, test_sym2 = 'x', 'y'
         expected_output = {test_sym1: expected_output, test_sym2: expected_output}
-        output = await functions.get_company_financials(test_sym1, test_sym2,
+        output = await functions.get_all_financials(test_sym1, test_sym2,
                                                     quarterly=quarterly, session=mock_session)
         self.assertDictEqual(expected_output, output)
-        mock__get_single_company_financials.assert_has_calls([
+        mock__get_single_company_all_financials.assert_has_calls([
             call(test_sym1, quarterly, mock_session),
             call(test_sym2, quarterly, mock_session)
         ])
@@ -212,7 +212,7 @@ class FunctionsTestCase(IsolatedAsyncioTestCase):
             IS: {END_DATE: ('End_Date_1', 'End_Date_2'), 'Cash & Short Term Investments': (11000000, -22000000)},
             CF: {END_DATE: ('End_Date_1', 'End_Date_2'), 'Cash & Short Term Investments': (11000000, -22000000)}
         }
-        output = await functions.get_company_financials(symbol, session=mock_session_obj)
+        output = await functions.get_all_financials(symbol, session=mock_session_obj)
         self.assertDictEqual(expected_output, output)
         mock_session_obj.get.assert_has_calls([
             call(f'{BASE_URL}/{symbol}/financials{FIN_STMT_URL_SUFFIX[BS]}'),