[PATCH patatt 6/7] Reduce dictionary lookups

Use `dict.get` instead of separately `in` checks and lookups.

Signed-off-by: Tamir Duberstein <[email protected]>
---
 src/patatt/__init__.py | 21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)

diff --git a/src/patatt/__init__.py b/src/patatt/__init__.py
index 7087479..b20074a 100644
--- a/src/patatt/__init__.py
+++ b/src/patatt/__init__.py
@@ -1024,8 +1024,8 @@ def get_data_dir() -> Path:
     Returns:
         Path to $XDG_DATA_HOME/patatt or ~/.local/share/patatt.
     """
-    if 'XDG_DATA_HOME' in os.environ:
-        datahome = Path(os.environ['XDG_DATA_HOME'])
+    if (xdg_data_home := os.environ.get('XDG_DATA_HOME')) is not None:
+        datahome = Path(xdg_data_home)
     else:
         datahome = Path.home() / '.local' / 'share'
     datadir = datahome / 'patatt'
@@ -1100,16 +1100,13 @@ def get_config_from_git(
                 continue
 
             if cfgkey in multivals:
-                if cfgkey not in gitconfig:
-                    values: List[str] = list()
+                cfgvalue = gitconfig.setdefault(cfgkey, list())
+                if isinstance(cfgvalue, str):
+                    values = [cfgvalue]
+                    gitconfig[cfgkey] = values
                 else:
-                    cfgvalue = gitconfig[cfgkey]
-                    if isinstance(cfgvalue, str):
-                        values = [cfgvalue]
-                    else:
-                        values = cfgvalue
+                    values = cfgvalue
                 values.append(value)
-                gitconfig[cfgkey] = values
             else:
                 gitconfig[cfgkey] = value
         except ValueError:
@@ -1423,8 +1420,8 @@ def get_algo_keydata(config: GitConfigType) -> Tuple[str, str]:
             'Identity must be a string, got %s' % type(identity).__name__
         )
 
-    if identity in KEYCACHE:
-        algo, keydata = KEYCACHE[identity]
+    if (t := KEYCACHE.get(identity)) is not None:
+        algo, keydata = t
         return algo, keydata
 
     if not config.get('signingkey'):

-- 
2.53.0