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[fix] Do not use len() to determine if a sequence is empty

Change-Id: I797fcb86f09797acbf0158fd465c07b611b75be8
---
M pywikibot/page/__init__.py
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/pywikibot/page/__init__.py b/pywikibot/page/__init__.py
index 233113f..38eb623 100644
--- a/pywikibot/page/__init__.py
+++ b/pywikibot/page/__init__.py
@@ -2254,7 +2254,7 @@
 
         @return: instance of FileInfo()
         """
-        if not len(self._file_revisions):
+        if not self._file_revisions:
             self.site.loadimageinfo(self, history=True)
         latest_ts = max(self._file_revisions)
         return self._file_revisions[latest_ts]
@@ -2269,7 +2269,7 @@
 
         @return: instance of FileInfo()
         """
-        if not len(self._file_revisions):
+        if not self._file_revisions:
             self.site.loadimageinfo(self, history=True)
         oldest_ts = min(self._file_revisions)
         return self._file_revisions[oldest_ts]
@@ -2282,7 +2282,7 @@
             key: timestamp of the entry
             value: instance of FileInfo()
         """
-        if not len(self._file_revisions):
+        if not self._file_revisions:
             self.site.loadimageinfo(self, history=True)
         return self._file_revisions
 

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