bpo-25652: Fix __rmod__ of UserString (GH-13326)
The ``__rmod__`` method of ``collections.UserString`` class had a bug that made it unusable.
https://bugs.python.org/issue25652
diff --git a/Lib/collections/__init__.py b/Lib/collections/__init__.py
index 960d82a..cb7f1bb 100644
--- a/Lib/collections/__init__.py
+++ b/Lib/collections/__init__.py
@@ -1214,9 +1214,8 @@
__rmul__ = __mul__
def __mod__(self, args):
return self.__class__(self.data % args)
- def __rmod__(self, format):
- return self.__class__(format % args)
-
+ def __rmod__(self, template):
+ return self.__class__(str(template) % self)
# the following methods are defined in alphabetical order:
def capitalize(self): return self.__class__(self.data.capitalize())
def casefold(self):
diff --git a/Lib/test/test_userstring.py b/Lib/test/test_userstring.py
index 7152822..19b0acf 100644
--- a/Lib/test/test_userstring.py
+++ b/Lib/test/test_userstring.py
@@ -39,6 +39,18 @@
# we don't fix the arguments, because UserString can't cope with it
getattr(object, methodname)(*args)
+ def test_rmod(self):
+ class ustr2(UserString):
+ pass
+
+ class ustr3(ustr2):
+ def __rmod__(self, other):
+ return super().__rmod__(other)
+
+ fmt2 = ustr2('value is %s')
+ str3 = ustr3('TEST')
+ self.assertEqual(fmt2 % str3, 'value is TEST')
+
if __name__ == "__main__":
unittest.main()
diff --git a/Misc/NEWS.d/next/Library/2019-05-14-21-39-52.bpo-25652.xLw42k.rst b/Misc/NEWS.d/next/Library/2019-05-14-21-39-52.bpo-25652.xLw42k.rst
new file mode 100644
index 0000000..421fccf
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2019-05-14-21-39-52.bpo-25652.xLw42k.rst
@@ -0,0 +1 @@
+Fix bug in ``__rmod__`` of ``UserString`` - by Batuhan Taskaya.