From ef12c8b600cd9a16e36610a8ab9903bd00b50efd Mon Sep 17 00:00:00 2001
From: ValueRaider <ValueRaider@protonmail.com>
Date: Sun, 23 Oct 2022 19:29:54 +0100
Subject: [PATCH 1/3] Catch read-only exceptions during cache write

---
 yfinance/base.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/yfinance/base.py b/yfinance/base.py
index 62fcfaa36..a0563417a 100644
--- a/yfinance/base.py
+++ b/yfinance/base.py
@@ -339,7 +339,11 @@ def _get_ticker_tz(self):
         if tkr_tz is None:
             tkr_tz = self.info["exchangeTimezoneName"]
             # info fetch is relatively slow so cache timezone
-            utils.cache_store_tkr_tz(self.ticker, tkr_tz)
+            try:
+                utils.cache_store_tkr_tz(self.ticker, tkr_tz)
+            except PermissionError:
+                # System probably read-only, so cannot cache
+                pass
 
         self._tz = tkr_tz
         return tkr_tz

From f525ee2f5e8824b3a14e42f3fcfb4b1cc9fd9c2e Mon Sep 17 00:00:00 2001
From: ValueRaider <ValueRaider@protonmail.com>
Date: Sun, 23 Oct 2022 19:47:22 +0100
Subject: [PATCH 2/3] Add README section on tz-cache ; Add
 set_tz_cache_location()

---
 README.md            | 14 ++++++++++++--
 yfinance/__init__.py |  3 ++-
 yfinance/utils.py    | 10 +++++++++-
 3 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index 639a340b4..7c16e9810 100644
--- a/README.md
+++ b/README.md
@@ -48,8 +48,6 @@ Yahoo! finance API is intended for personal use only.**
 
 The `Ticker` module, which allows you to access ticker data in a more Pythonic way:
 
-Note: yahoo finance datetimes are received as UTC.
-
 ```python
 import yfinance as yf
 
@@ -214,6 +212,18 @@ data = yf.download(  # or pdr.get_data_yahoo(...
     )
 ```
 
+### Timezone cache store
+
+When fetching price data, all dates are localized to stock exchange timezone. 
+But timezone retrieval is relatively slow, so yfinance attemps to cache them 
+in your users cache folder. 
+You can direct cache to use a different location with `set_tz_cache_location()`:
+```python
+import yfinance as yf
+yf.set_tz_cache_location("custom/cache/location")
+...
+```
+
 ### Managing Multi-Level Columns
 
 The following answer on Stack Overflow is for [How to deal with
diff --git a/yfinance/__init__.py b/yfinance/__init__.py
index 5e87a98e3..737104531 100644
--- a/yfinance/__init__.py
+++ b/yfinance/__init__.py
@@ -23,6 +23,7 @@
 from .ticker import Ticker
 from .tickers import Tickers
 from .multi import download
+from .utils import set_tz_cache_location
 
 __version__ = version.version
 __author__ = "Ran Aroussi"
@@ -42,4 +43,4 @@ def pdr_override():
         pass
 
 
-__all__ = ['download', 'Ticker', 'Tickers', 'pdr_override']
+__all__ = ['download', 'Ticker', 'Tickers', 'pdr_override', 'set_tz_cache_location']
diff --git a/yfinance/utils.py b/yfinance/utils.py
index d611575c3..f85e5a823 100644
--- a/yfinance/utils.py
+++ b/yfinance/utils.py
@@ -316,8 +316,16 @@ def __str__(self):
 
 
 # Simple file cache of ticker->timezone:
+_cache_dp = None
 def get_cache_dirpath():
-    return _os.path.join(_ad.user_cache_dir(), "py-yfinance")
+    if _cache_dp is None:
+        dp = _os.path.join(_ad.user_cache_dir(), "py-yfinance")
+    else:
+        dp = _os.path.join(_cache_dp, "py-yfinance")
+def set_tz_cache_location(dp):
+    global _cache_dp
+    _cache_dp = dp
+
 def cache_lookup_tkr_tz(tkr):
     fp = _os.path.join(get_cache_dirpath(), "tkr-tz.csv")
     if not _os.path.isfile(fp):

From 90e00a71caf934ae17ed103afe2d9ef5eb63a89d Mon Sep 17 00:00:00 2001
From: ValueRaider <ValueRaider@protonmail.com>
Date: Sun, 23 Oct 2022 19:51:09 +0100
Subject: [PATCH 3/3] Fix missing 'return'

---
 yfinance/utils.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/yfinance/utils.py b/yfinance/utils.py
index f85e5a823..131c0df66 100644
--- a/yfinance/utils.py
+++ b/yfinance/utils.py
@@ -322,6 +322,7 @@ def get_cache_dirpath():
         dp = _os.path.join(_ad.user_cache_dir(), "py-yfinance")
     else:
         dp = _os.path.join(_cache_dp, "py-yfinance")
+    return dp
 def set_tz_cache_location(dp):
     global _cache_dp
     _cache_dp = dp