Remove ExceptionInfo.__str__, falling back to __repr__

Fix #5412

changelog/5412.removal.rst

@@ -0,0 +1,2 @@
+``ExceptionInfo`` objects (returned by ``pytest.raises``) now have the same ``str`` representation as ``repr``, which
+avoids some confusion when users use ``print(e)`` to inspect the object.

src/_pytest/_code/code.py

@@ -534,13 +534,6 @@ class ExceptionInfo:
         )
         return fmt.repr_excinfo(self)
 
-    def __str__(self):
-        if self._excinfo is None:
-            return repr(self)
-        entry = self.traceback[-1]
-        loc = ReprFileLocation(entry.path, entry.lineno + 1, self.exconly())
-        return str(loc)
-
     def match(self, regexp):
         """
         Check whether the regular expression 'regexp' is found in the string

testing/code/test_excinfo.py

@@ -333,18 +333,10 @@ def test_excinfo_exconly():
     assert msg.endswith("world")
 
 
-def test_excinfo_repr():
+def test_excinfo_repr_str():
     excinfo = pytest.raises(ValueError, h)
-    s = repr(excinfo)
-    assert s == "<ExceptionInfo ValueError tblen=4>"
-
-
-def test_excinfo_str():
-    excinfo = pytest.raises(ValueError, h)
-    s = str(excinfo)
-    assert s.startswith(__file__[:-9])  # pyc file and $py.class
-    assert s.endswith("ValueError")
-    assert len(s.split(":")) >= 3  # on windows it's 4
+    assert repr(excinfo) == "<ExceptionInfo ValueError tblen=4>"
+    assert str(excinfo) == "<ExceptionInfo ValueError tblen=4>"
 
 
 def test_excinfo_for_later():