[typing] solve some mypy issues

Change-Id: I3048641df1a6e5d4ced1ad3688a12a3e2f72c6e7
---
M pywikibot/textlib.py
M pywikibot/family.py
M pywikibot/throttle.py
M pywikibot/cosmetic_changes.py
M pywikibot/backports.py
5 files changed, 30 insertions(+), 16 deletions(-)

diff --git a/pywikibot/backports.py b/pywikibot/backports.py
index f2a77ec..02b59fe 100644
--- a/pywikibot/backports.py
+++ b/pywikibot/backports.py
@@ -69,6 +69,7 @@
 if PYTHON_VERSION < (3, 9):
     from typing import (
         Container,
+        Counter,
         Dict,
         FrozenSet,
         Generator,
@@ -92,6 +93,7 @@
         Mapping,
         Sequence,
     )
+    from collections import Counter
     from re import Match, Pattern
     Dict = dict  # type: ignore[misc]
     FrozenSet = frozenset  # type: ignore[misc]
diff --git a/pywikibot/cosmetic_changes.py b/pywikibot/cosmetic_changes.py
index 29d8f64..05d7209 100644
--- a/pywikibot/cosmetic_changes.py
+++ b/pywikibot/cosmetic_changes.py
@@ -707,7 +707,7 @@
         header, sections, footer = textlib.extract_sections(text, self.site)
 
         # iterate stripped sections and create a new page body
-        new_body = []
+        new_body: List[textlib.Section] = []
         for i, strip_section in enumerate(strip_sections):
             current_dep = sections[i].level
             try:
diff --git a/pywikibot/family.py b/pywikibot/family.py
index 52c6d3a..ed3bba9 100644
--- a/pywikibot/family.py
+++ b/pywikibot/family.py
@@ -21,6 +21,7 @@
 import pywikibot
 from pywikibot import config
 from pywikibot.backports import (
+    DefaultDict,
     Dict,
     FrozenSet,
     List,
@@ -36,6 +37,8 @@
 
 logger = logging.getLogger('pywiki.wiki.family')
 
+CrossnamespaceType = DefaultDict[str, Dict[str, List[int]]]
+
 # Legal characters for Family.name and Family.langs keys
 NAME_CHARACTERS = string.ascii_letters + string.digits
 # nds_nl code alias requires "_"n
@@ -135,8 +138,8 @@
     # should be avoided
     archived_page_templates: Dict[str, Tuple[str, ...]] = {}
 
-    # A list of projects that share cross-project sessions.
-    cross_projects = []
+    # A set of projects that share cross-project sessions.
+    cross_projects: Set[str] = set()
 
     # A list with the name for cross-project cookies.
     # default for wikimedia centralAuth extensions.
@@ -182,7 +185,7 @@
     # is checked first, and languages are put in the order given there.
     # All other languages are put after those, in code-alphabetical
     # order.
-    interwiki_putfirst = {}
+    interwiki_putfirst: Dict[str, str] = {}
 
     # Some families, e. g. commons and meta, are not multilingual and
     # forward interlanguage links to another family (wikipedia).
@@ -267,7 +270,7 @@
     #   values are dicts where:
     #     keys are the languages that can be linked to from the lang+ns, or
     #     '_default'; values are a list of namespace numbers
-    crossnamespace = collections.defaultdict(dict)
+    crossnamespace: CrossnamespaceType = collections.defaultdict(dict)
     ##
     # Examples :
     #
@@ -302,7 +305,7 @@
     .. versionadded:: 7.0
     """
 
-    _families = {}
+    _families: Dict[str, 'Family'] = {}
 
     @staticmethod
     def load(fam: Optional[str] = None):
diff --git a/pywikibot/textlib.py b/pywikibot/textlib.py
index 99ca938..f68e6a6 100644
--- a/pywikibot/textlib.py
+++ b/pywikibot/textlib.py
@@ -582,7 +582,7 @@
     """
 
     textdata = ''
-    keeptags = []
+    keeptags: List[str] = []
 
     def __enter__(self) -> None:
         pass
@@ -1140,15 +1140,14 @@
     text: str,
     insite=None,
     template_subpage: bool = False
-) -> Dict:
-    """
-    Return a dict of inter-language links found in text.
+) -> Dict['pywikibot.site.BaseSite', 'pywikibot.Page']:
+    """Return a dict of inter-language links found in text.
 
-    The returned dict uses the site as keys and Page objects as values. It does
-    not contain its own site.
+    The returned dict uses the site as keys and Page objects as values.
+    It does not contain its own site.
 
-    Do not call this routine directly, use Page.interwiki() method
-    instead.
+    Do not call this routine directly, use
+    :meth:`page.BasePage.interwiki` method instead.
     """
     if insite is None:
         insite = pywikibot.Site()
@@ -1157,7 +1156,7 @@
     # infos there
     if fam.interwiki_forward:
         fam = Family.load(fam.interwiki_forward)
-    result = {}
+    result: Dict[pywikibot.site.BaseSite, pywikibot.Page] = {}
     # Ignore interwiki links within nowiki tags, includeonly tags, pre tags,
     # and HTML comments
     include = []
diff --git a/pywikibot/throttle.py b/pywikibot/throttle.py
index 825bfa3..348e751 100644
--- a/pywikibot/throttle.py
+++ b/pywikibot/throttle.py
@@ -15,6 +15,7 @@
 
 import pywikibot
 from pywikibot import config
+from pywikibot.backports import Counter as CounterType
 from pywikibot.tools import deprecated
 
 
@@ -72,7 +73,7 @@
         self.retry_after = 0  # set by http.request
         self.delay = 0
         self.checktime = 0.0
-        self.modules = Counter()
+        self.modules: CounterType[str] = Counter()
 
         self.checkMultiplicity()
         self.setDelays()

