DOC: Clarify that methods taking a MultiIndex level index also accept the name

Author: toobaz

pandas/core/frame.py

@@ -3850,7 +3850,7 @@ def count(self, axis=0, level=None, numeric_only=False):
         ----------
         axis : {0, 1}
             0 for row-wise, 1 for column-wise
-        level : int, default None
+        level : int or level name, default None
             If the axis is a MultiIndex (hierarchical), count along a
             particular level, collapsing into a DataFrame
         numeric_only : boolean, default False
@@ -3926,7 +3926,7 @@ def any(self, axis=None, bool_only=None, skipna=True, level=None,
         skipna : boolean, default True
             Exclude NA/null values. If an entire row/column is NA, the result
             will be NA
-        level : int, default None
+        level : int or level name, default None
             If the axis is a MultiIndex (hierarchical), count along a
             particular level, collapsing into a DataFrame
         bool_only : boolean, default None
@@ -3957,7 +3957,7 @@ def all(self, axis=None, bool_only=None, skipna=True, level=None,
         skipna : boolean, default True
             Exclude NA/null values. If an entire row/column is NA, the result
             will be NA
-        level : int, default None
+        level : int or level name, default None
             If the axis is a MultiIndex (hierarchical), count along a
             particular level, collapsing into a DataFrame
         bool_only : boolean, default None

pandas/core/generic.py

@@ -3454,7 +3454,7 @@ def _add_numeric_operations(cls):
 skipna : boolean, default True
     Exclude NA/null values. If an entire row/column is NA, the result
     will be NA
-level : int, default None
+level : int or level name, default None
         If the axis is a MultiIndex (hierarchical), count along a
         particular level, collapsing into a """ + name + """
 numeric_only : boolean, default None

pandas/core/series.py

@@ -1064,7 +1064,7 @@ def count(self, level=None):
 
         Parameters
         ----------
-        level : int, default None
+        level : int or level name, default None
             If the axis is a MultiIndex (hierarchical), count along a
             particular level, collapsing into a smaller Series