fix typo for null_count in expr.py (#3578)

pola-rs · Jun 5, 2022 · 07bb987 · 07bb987
1 parent 6b32fa8
commit 07bb987
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/py-polars/polars/internals/expr.py b/py-polars/polars/internals/expr.py
@@ -1349,7 +1349,7 @@ def n_unique(self) -> "Expr":
         return wrap_expr(self._pyexpr.n_unique())
 
     def null_count(self) -> "Expr":
-        """Count unique values."""
+        """Count null values."""
         return wrap_expr(self._pyexpr.null_count())
 
     def arg_unique(self) -> "Expr":