added one docstring

src/stock-symbol-scraper/main.py

@@ -80,6 +80,23 @@ async def trs_from_page(url: str, session: ClientSession = None, limit: int = No
 
 async def get_data_from_category(category: str, session: ClientSession = None,
                                  first_page: int = 1, last_page: int = inf) -> list[row_type]:
+    """
+    Returns data rows from a category (i.e. companies starting with that specific letter).
+
+    Args:
+        category:
+            Must be a valid component of the URL path indicating the first character-category (e.g. 'A' or '0-9').
+        session (optional):
+            If passed a ClientSession instance, all HTTP requests will be made using that session;
+            otherwise a new one is created.
+        first_page (optional):
+            The number of the page to begin with when scraping the results; defaults to 1.
+        last_page (optional):
+            The number of the last page to scrape; by default all pages starting with `first_page` are scraped.
+
+    Returns:
+        A list of 5-tuples (of string elements) extracted from the specified pages
+    """
     log.info(f"Getting companies starting with '{category}'")
     if session is None:
         session = ClientSession()