Add missing type hints to synapse.util (#9982)

4 files changed, 19 insertions, 21 deletions

diff --git a/synapse/util/hash.py b/synapse/util/hash.py
index ba676e1762..7625ca8c2c 100644
--- a/synapse/util/hash.py
+++ b/synapse/util/hash.py
@@ -17,15 +17,15 @@ import hashlib
 import unpaddedbase64
 
 
-def sha256_and_url_safe_base64(input_text):
+def sha256_and_url_safe_base64(input_text: str) -> str:
     """SHA256 hash an input string, encode the digest as url-safe base64, and
     return
 
-    :param input_text: string to hash
-    :type input_text: str
+    Args:
+        input_text: string to hash
 
-    :returns a sha256 hashed and url-safe base64 encoded digest
-    :rtype: str
+    returns:
+        A sha256 hashed and url-safe base64 encoded digest
     """
     digest = hashlib.sha256(input_text.encode()).digest()
     return unpaddedbase64.encode_base64(digest, urlsafe=True)
diff --git a/synapse/util/iterutils.py b/synapse/util/iterutils.py
index abfdc29832..886afa9d19 100644
--- a/synapse/util/iterutils.py
+++ b/synapse/util/iterutils.py
@@ -30,12 +30,12 @@ from typing import (
 T = TypeVar("T")
 
 
-def batch_iter(iterable: Iterable[T], size: int) -> Iterator[Tuple[T]]:
+def batch_iter(iterable: Iterable[T], size: int) -> Iterator[Tuple[T, ...]]:
     """batch an iterable up into tuples with a maximum size
 
     Args:
-        iterable (iterable): the iterable to slice
-        size (int): the maximum batch size
+        iterable: the iterable to slice
+        size: the maximum batch size
 
     Returns:
         an iterator over the chunks
@@ -46,10 +46,7 @@ def batch_iter(iterable: Iterable[T], size: int) -> Iterator[Tuple[T]]:
     return iter(lambda: tuple(islice(sourceiter, size)), ())
 
 
-ISeq = TypeVar("ISeq", bound=Sequence, covariant=True)
-
-
-def chunk_seq(iseq: ISeq, maxlen: int) -> Iterable[ISeq]:
+def chunk_seq(iseq: Sequence[T], maxlen: int) -> Iterable[Sequence[T]]:
     """Split the given sequence into chunks of the given size
 
     The last chunk may be shorter than the given size.
diff --git a/synapse/util/module_loader.py b/synapse/util/module_loader.py
index 8acbe276e4..cbfbd097f9 100644
--- a/synapse/util/module_loader.py
+++ b/synapse/util/module_loader.py
@@ -15,6 +15,7 @@
 import importlib
 import importlib.util
 import itertools
+from types import ModuleType
 from typing import Any, Iterable, Tuple, Type
 
 import jsonschema
@@ -44,8 +45,8 @@ def load_module(provider: dict, config_path: Iterable[str]) -> Tuple[Type, Any]:
 
     # We need to import the module, and then pick the class out of
     # that, so we split based on the last dot.
-    module, clz = modulename.rsplit(".", 1)
-    module = importlib.import_module(module)
+    module_name, clz = modulename.rsplit(".", 1)
+    module = importlib.import_module(module_name)
     provider_class = getattr(module, clz)
 
     # Load the module config. If None, pass an empty dictionary instead
@@ -69,11 +70,11 @@ def load_module(provider: dict, config_path: Iterable[str]) -> Tuple[Type, Any]:
     return provider_class, provider_config
 
 
-def load_python_module(location: str):
+def load_python_module(location: str) -> ModuleType:
     """Load a python module, and return a reference to its global namespace
 
     Args:
-        location (str): path to the module
+        location: path to the module
 
     Returns:
         python module object
diff --git a/synapse/util/msisdn.py b/synapse/util/msisdn.py
index bbbdebf264..1046224f15 100644
--- a/synapse/util/msisdn.py
+++ b/synapse/util/msisdn.py
@@ -17,19 +17,19 @@ import phonenumbers
 from synapse.api.errors import SynapseError
 
 
-def phone_number_to_msisdn(country, number):
+def phone_number_to_msisdn(country: str, number: str) -> str:
     """
     Takes an ISO-3166-1 2 letter country code and phone number and
     returns an msisdn representing the canonical version of that
     phone number.
     Args:
-        country (str): ISO-3166-1 2 letter country code
-        number (str): Phone number in a national or international format
+        country: ISO-3166-1 2 letter country code
+        number: Phone number in a national or international format
 
     Returns:
-        (str) The canonical form of the phone number, as an msisdn
+        The canonical form of the phone number, as an msisdn
     Raises:
-            SynapseError if the number could not be parsed.
+        SynapseError if the number could not be parsed.
     """
     try:
         phoneNumber = phonenumbers.parse(number, country)