ignored example

Author: niruta25

doc/source/user_guide/indexing.rst

@@ -1778,7 +1778,7 @@ Examples:
    #If you want positional assignment instead of index alignment:
    # Convert Series to array/list for positional assignment
 
-   df['positional'] = s1.values  # or s1.tolist()
+   df['positional'] = s1.tolist()
 
    # Or reset the Series index to match DataFrame index
    df['s1_values'] = s1.reindex(df.index)

pandas/core/frame.py

@@ -4285,6 +4285,18 @@ def __setitem__(self, key, value) -> None:
         b  2  100
         c  3  NaN
         d  4  200
+
+        Series index labels NOT in DataFrame, ignored:
+
+        >>> df = pd.DataFrame({"A": [1, 2, 3]}, index=["x", "y", "z"])
+        >>> s = pd.Series([10, 20, 30, 40, 50], index=["x", "y", "a", "b", "z"])
+        >>> df["B"] = s
+        >>> df
+           A   B
+        x  1  10
+        y  2  20
+        z  3  50
+        # Values for 'a' and 'b' are completely ignored!
         """
         if not PYPY:
             if sys.getrefcount(self) <= 3: