[IMPR] do not evaluate Site() with dict.pop() as default value

Bug: T335720
Change-Id: Ic62d52fb5fdfde1b2af53003f0e38f804363f2f2
---
M scripts/interwiki.py
M pywikibot/comms/eventstreams.py
2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/pywikibot/comms/eventstreams.py b/pywikibot/comms/eventstreams.py
index cd9c280..7f07bc0 100644
--- a/pywikibot/comms/eventstreams.py
+++ b/pywikibot/comms/eventstreams.py
@@ -10,7 +10,7 @@
 .. versionadded:: 3.0
 """
 #
-# (C) Pywikibot team, 2017-2022
+# (C) Pywikibot team, 2017-2023
 #
 # Distributed under the terms of the MIT license.
 #
@@ -143,7 +143,10 @@
                               'install it with "pip install sseclient"\n')
         self.filter = {'all': [], 'any': [], 'none': []}
         self._total = None
-        self._site = kwargs.pop('site', Site())
+        try:
+            self._site = kwargs.pop('site')
+        except KeyError:  # T335720
+            self._site = Site()
 
         self._streams = kwargs.pop('streams', None)
         if self._streams and not isinstance(self._streams, str):
diff --git a/scripts/interwiki.py b/scripts/interwiki.py
index a8cb116..580a9d0 100755
--- a/scripts/interwiki.py
+++ b/scripts/interwiki.py
@@ -2147,7 +2147,10 @@
         :keyword do_continue: If true, continue alphabetically starting at the
             last of the dumped pages.
         """
-        self.site = kwargs.pop('site', pywikibot.Site())
+        try:
+            self.site = kwargs.pop('site')
+        except KeyError:  # T335720
+            self.site = pywikibot.Site()
         super().__init__(**kwargs)
 
         self.restored_files = set()

