add docstrings

Author: jschendel

pandas/core/common.py

@@ -223,38 +223,44 @@ def _mut_exclusive(**kwargs):
 
 
 def _not_none(*args):
+    """Returns a generator consisting of the arguments that are not None"""
     return (arg for arg in args if arg is not None)
 
 
 def _any_none(*args):
+    """Returns a boolean indicating if any argument is None"""
     for arg in args:
         if arg is None:
             return True
     return False
 
 
 def _all_none(*args):
+    """Returns a boolean indicating if all arguments are None"""
     for arg in args:
         if arg is not None:
             return False
     return True
 
 
 def _any_not_none(*args):
+    """Returns a boolean indicating if any argument is not None"""
     for arg in args:
         if arg is not None:
             return True
     return False
 
 
 def _all_not_none(*args):
+    """Returns a boolean indicating if all arguments are not None"""
     for arg in args:
         if arg is None:
             return False
     return True
 
 
 def _count_not_none(*args):
+    """Returns the count of arguments that are not None"""
     return sum(x is not None for x in args)