Merge remote-tracking branch 'origin/u/dkrenn/pushout/functor-str' in…

…to u/dkrenn/functor-str-on-6.8

* origin/u/dkrenn/pushout/functor-str:
  more replacements of __str__ by _repr_

src/sage/modular/modform_hecketriangle/functors.py

@@ -206,7 +206,7 @@ def __call__(self, R):
         else:
             return ambient_space
 
-    def __str__(self):
+    def _repr_(self):
         r"""
         Return the string representation of ``self``.
 
@@ -388,7 +388,7 @@ def __call__(self, R):
             merged_functor = self.merge(ConstantFormsSpaceFunctor(self._group))
             return merged_functor(R)
 
-    def __str__(self):
+    def _repr_(self):
         r"""
         Return the string representation of ``self``.
 
@@ -577,7 +577,7 @@ def __call__(self, R):
             merged_functor = self.merge(ConstantFormsSpaceFunctor(self._group))
             return merged_functor(R)
 
-    def __str__(self):
+    def _repr_(self):
         r"""
         Return the string representation of ``self``.