Format black and fix tests

src/login.py

@@ -9,8 +9,9 @@ conn = st.connection("gsheets", type=GSheetsConnection)
 def get_user_id_from_email_if_exists(email: str) -> int:
     # returns -1 if id not found
     df_email = conn.read(
-    worksheet="users",
-    usecols=[0, 1],)
+        worksheet="users",
+        usecols=[0, 1],
+    )
     df_email = df_email[df_email.email.notna()]
     for row in df_email.itertuples():
         if row.email.lower() == email.lower():
@@ -21,11 +22,11 @@ def get_user_id_from_email_if_exists(email: str) -> int:
 def get_password_from_user_id(user_id: int) -> str | None:
     try:
         df_pass = conn.read(
-        worksheet=f"user-{user_id}",
-        usecols=[0],)
-        if len(df_pass):
-            return df_pass.password[0]
-    except:
+            worksheet=f"user-{user_id}",
+            usecols=[0],
+        )
+        return df_pass.password[0]
+    except Exception:
         return None
 
 
@@ -42,8 +43,8 @@ def check_password():
     def password_entered():
         """Checks whether a password entered by the user is correct."""
         # check if email exists
-        if user_id:=get_user_id_from_email_if_exists(st.session_state["email"]):
-            if password:=get_password_from_user_id(user_id):
+        if user_id := get_user_id_from_email_if_exists(st.session_state["email"]):
+            if password := get_password_from_user_id(user_id):
                 if hmac.compare_digest(
                     st.session_state["password"],
                     password,
@@ -55,7 +56,6 @@ def check_password():
                     return
         st.session_state["password_correct"] = False
 
-
     # Return True if the email + password is validated.
     if st.session_state.get("password_correct", False):
         return True