diff --git a/bpython/curtsiesfrontend/manual_readline.py b/bpython/curtsiesfrontend/manual_readline.py
index 24a1b9a27..a919df14d 100644
--- a/bpython/curtsiesfrontend/manual_readline.py
+++ b/bpython/curtsiesfrontend/manual_readline.py
@@ -280,8 +280,10 @@ def yank_prev_killed_text(cursor_offset, line, cut_buffer):
@edit_keys.on(config='transpose_chars_key')
def transpose_character_before_cursor(cursor_offset, line):
- if cursor_offset == 0:
+ if cursor_offset < 2:
return cursor_offset, line
+ if cursor_offset == len(line):
+ return cursor_offset, line[:-2] + line[-1] + line[-2]
return (min(len(line), cursor_offset + 1),
line[:cursor_offset - 1] +
(line[cursor_offset] if len(line) > cursor_offset else '') +
diff --git a/bpython/test/test_manual_readline.py b/bpython/test/test_manual_readline.py
index f1e24b780..3c25e3bb5 100644
--- a/bpython/test/test_manual_readline.py
+++ b/bpython/test/test_manual_readline.py
@@ -207,9 +207,15 @@ def test_transpose_empty_line(self):
def test_transpose_first_character(self):
self.assertEquals(transpose_character_before_cursor(0, 'a'),
- transpose_character_before_cursor(0, 'a'))
+ (0, 'a'))
self.assertEquals(transpose_character_before_cursor(0, 'as'),
- transpose_character_before_cursor(0, 'as'))
+ (0, 'as'))
+
+ def test_transpose_end_of_line(self):
+ self.assertEquals(transpose_character_before_cursor(1, 'a'),
+ (1, 'a'))
+ self.assertEquals(transpose_character_before_cursor(2, 'as'),
+ (2, 'sa'))
def test_transpose_word_before_cursor(self):
pass
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