utils: Add more typing

ols/utils.py

@@ -187,7 +187,7 @@ def min_or_none(seq: list[Optional[int]]) -> Optional[int]:
         return min(seq)  # type: ignore
 
 
-def opc_to_mcc_mnc(opc):
+def opc_to_mcc_mnc(opc: str) -> (Optional[int], Optional[int]):
     """Return (mcc, mnc) integer tuple from opc string."""
     mcclen = 3
     try:
@@ -200,7 +200,7 @@ def opc_to_mcc_mnc(opc):
     return mcc, mnc
 
 
-def mcc_mnc_to_opc(mcc, mnc):
+def mcc_mnc_to_opc(mcc: int, mnc: int) -> str:
     """Return operator code (OPC) string formed from MCC and MNC given as ints.
 
     MCC and MNC are actually strings, but Ichnaea API treats them as ints,
@@ -216,11 +216,13 @@ def mcc_mnc_to_opc(mcc, mnc):
     return f'{mcc:03}{mnc:02}'
 
 
-def encode_cellid(tec, opc, lac, cid, **kwargs):
+def encode_cellid(tec: str, opc: str, lac: int, cid: int, **kwargs) -> str:
     return f'{tec.upper()}_{opc}_{lac}_{cid}'
 
-def encode_cellarea(tec, opc, lac, **kwargs):
+
+def encode_cellarea(tec: str, opc: str, lac: int, **kwargs) -> str:
     return f'c_{tec.upper()}_{opc}_{lac}'
 
-def encode_wifi(mac):
+
+def encode_wifi(mac: str) -> str:
     return f'w_{mac.lower()}'