correct

Author: zhangbowen-coder

pandas/core/frame.py

@@ -368,13 +368,29 @@
 sort : bool, default False
     Sort the join keys lexicographically in the result DataFrame. If False,
     the order of the join keys depends on the join type (how keyword).
+diff_option : Literal str
+    The allowed values are "suffix"、"prefix"、"both",default "suffix".
+    If the value is "suffix", the duplicated columns will be differentiated
+    using the suffixes provided by parameter "suffixes".
+    If the value is "prefix", the duplicated columns will be differentiated
+    using the prefixes provided by parameter "prefixes".
+    If the value is "both", the duplicated columns will be differentiated
+    using both the suffixes provided by parameter "suffixes" and
+    the prefixes provided by parameter "prefixes".
 suffixes : list-like, default is ("_x", "_y")
     A length-2 sequence where each element is optionally a string
     indicating the suffix to add to overlapping column names in
     `left` and `right` respectively. Pass a value of `None` instead
     of a string to indicate that the column name from `left` or
     `right` should be left as-is, with no suffix. At least one of the
     values must not be None.
+prefixes : list-like, default is ("a_", "b_")
+    A length-2 sequence where each element is optionally a string
+    indicating the prefix to add to overlapping column names in
+    `left` and `right` respectively. Pass a value of `None` instead
+    of a string to indicate that the column name from `left` or
+    `right` should be left as-is, with no prefix. At least one of the
+    values must not be None.
 copy : bool, default False
     If False, avoid copy if possible.