Expose/raise all yfinance exceptions

Otherwise, we potentially run into problems later on. See #19 for an example.

Unfortunately, yfinance currently doesn't give very useful information
in its exceptions and therefore doesn't help to understand the
underlying issue (i.e., symbol not found vs no network connectivity at
all vs ...). Therefore we no longer raise a `SymbolNotFoundException`
any longer here but simply pass through what yfinance raises.

Resolves #19

tessa/price/yahoo.py

@@ -2,7 +2,7 @@
 
 import pandas as pd
 import yfinance as yf
-from .types import PriceHistory, SymbolNotFoundError
+from .types import PriceHistory
 
 START_FROM = "2000-01-01"
 """Adjust this date if you need to get historical data further in the past. Note that
@@ -18,11 +18,7 @@ def get_price_history(
     that ticker.
     """
     ticker = yf.Ticker(query)
-    try:
-        df = ticker.history(start=START_FROM, raise_errors=True)
-    except Exception as exc:  # pylint: disable=broad-except
-        if "No timezone found" in str(exc):
-            raise SymbolNotFoundError(source="yahoo", query=query) from exc
+    df = ticker.history(start=START_FROM, raise_errors=True)
 
     # Simplify dataframe:
     df = df.copy()

tests/price/test_yahoo_api.py

@@ -4,7 +4,6 @@
 
 import pytest
 from tessa.price import yahoo
-from tessa.price.types import SymbolNotFoundError
 
 
 @pytest.mark.parametrize(
@@ -28,6 +27,5 @@ def test_api_returns_reasonable_data(query: str, expected_currency: str):
 
 @pytest.mark.net
 def test_non_existing_query_raises():
-    with pytest.raises(SymbolNotFoundError) as excinfo:
+    with pytest.raises(Exception):
         yahoo.get_price_history("thisshouldntexistreally")
-    assert "No symbol found" in str(excinfo.value)