Make code work w Python 3.7

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "tessa"
-version = "0.3.1"
+version = "0.3.2"
 description = "Find financial assets and get their price history without worrying about different APIs or rate limiting."
 authors = ["ymyke"]
 license = "MIT"

tessa/__init__.py

@@ -1,4 +1,4 @@
-__version__ = "0.3.1"
+__version__ = "0.3.2"
 
 from .price import price_history, price_point, price_point_strict, price_latest
 from .search import search

tessa/coingecko_search.py

@@ -4,7 +4,7 @@
 from pycoingecko import CoinGeckoAPI
 
 
-@functools.cache
+@functools.lru_cache(maxsize=None)
 def get_symbol_map() -> list:
     """Get the symbol map. Separate function to use caching, so the API doesn't get
     hit too often.

tessa/investing_search.py

@@ -29,13 +29,14 @@ def investing_search(
     r2 = investing_search("AAPL", countries=["united states", "canada"], products="stocks")
     ```
     """
-    return search_name_or_symbol(query, countries, products) | search_for_searchobjs(
-        query, countries, products
-    )
+    return {
+        **search_name_or_symbol(query, countries, products),
+        **search_for_searchobjs(query, countries, products),
+    }
 
 
 @freezeargs
-@functools.cache
+@functools.lru_cache(maxsize=None)
 def search_name_or_symbol(
     query: str,
     countries: Optional[Union[list, str]] = None,
@@ -102,7 +103,7 @@ def search_name_or_symbol(
 
 
 @freezeargs
-@functools.cache
+@functools.lru_cache(maxsize=None)
 def search_for_searchobjs(
     query: str,
     countries: Optional[Union[list, str]] = None,

tessa/price.py

@@ -10,7 +10,7 @@
 
 
 @freezeargs
-@functools.cache
+@functools.lru_cache(maxsize=None)
 def price_history(
     query: str, type_: str, country: str = None, currency_preference: str = "usd"
 ) -> Tuple[pd.DataFrame, str]: