Use DeprecationWarning for core.common deprecations (GH13634)

Author: jorisvandenbossche

pandas/api/tests/test_api.py

@@ -163,7 +163,7 @@ def test_types(self):
         self.check(types, self.allowed)
 
     def check_deprecation(self, fold, fnew):
-        with tm.assert_produces_warning(FutureWarning):
+        with tm.assert_produces_warning(DeprecationWarning):
             try:
                 result = fold('foo')
                 expected = fnew('foo')

pandas/core/common.py

@@ -31,7 +31,7 @@ def wrapper(*args, **kwargs):
             warnings.warn("pandas.core.common.{t} is deprecated. "
                           "import from the public API: "
                           "pandas.api.types.{t} instead".format(t=t),
-                          FutureWarning, stacklevel=3)
+                          DeprecationWarning, stacklevel=3)
             return getattr(types, t)(*args, **kwargs)
         return wrapper
 
@@ -57,7 +57,7 @@ def wrapper(*args, **kwargs):
                           "These are not longer public API functions, "
                           "but can be imported from "
                           "pandas.types.common.{t} instead".format(t=t),
-                          FutureWarning, stacklevel=3)
+                          DeprecationWarning, stacklevel=3)
             return getattr(common, t)(*args, **kwargs)
         return wrapper