Fix the default placeholder in textwrap.shorten() to be " [...]".

For some reason I forgot to do it before committing the patch in issue #18585.

Doc/library/textwrap.rst

@@ -40,7 +40,7 @@ functions should be good enough; otherwise, you should use an instance of
    :func:`wrap`.
 
 
-.. function:: shorten(text, width=70, *, placeholder=" (...)")
+.. function:: shorten(text, width=70, *, placeholder=" [...]")
 
    Collapse and truncate the given text to fit in the given width.
 
@@ -51,7 +51,7 @@ functions should be good enough; otherwise, you should use an instance of
       >>> textwrap.shorten("Hello  world!", width=12)
       'Hello world!'
       >>> textwrap.shorten("Hello  world!", width=11)
-      'Hello (...)'
+      'Hello [...]'
       >>> textwrap.shorten("Hello world", width=10, placeholder="...")
       'Hello...'
 
@@ -268,7 +268,7 @@ hyphenated words; only then will long words be broken if necessary, unless
       containing the wrapped paragraph.
 
 
-   .. function:: shorten(text, *, placeholder=" (...)")
+   .. function:: shorten(text, *, placeholder=" [...]")
 
       Collapse and truncate the given text to fit in :attr:`width`
       characters.

Lib/test/test_textwrap.py

@@ -786,11 +786,11 @@ class ShortenTestCase(BaseTestCase):
         # Simple case: just words, spaces, and a bit of punctuation
         text = "Hello there, how are you this fine day? I'm glad to hear it!"
 
-        self.check_shorten(text, 18, "Hello there, (...)")
+        self.check_shorten(text, 18, "Hello there, [...]")
         self.check_shorten(text, len(text), text)
         self.check_shorten(text, len(text) - 1,
             "Hello there, how are you this fine day? "
-            "I'm glad to (...)")
+            "I'm glad to [...]")
 
     def test_placeholder(self):
         text = "Hello there, how are you this fine day? I'm glad to hear it!"
@@ -816,13 +816,13 @@ class ShortenTestCase(BaseTestCase):
                              "breaks and tabs too.")
         self.check_shorten(text, 61,
                              "This is a paragraph that already has line "
-                             "breaks and (...)")
+                             "breaks and [...]")
 
         self.check_shorten("hello      world!  ", 12, "hello world!")
-        self.check_shorten("hello      world!  ", 11, "hello (...)")
+        self.check_shorten("hello      world!  ", 11, "hello [...]")
         # The leading space is trimmed from the placeholder
         # (it would be ugly otherwise).
-        self.check_shorten("hello      world!  ", 10, "(...)")
+        self.check_shorten("hello      world!  ", 10, "[...]")
 
     def test_width_too_small_for_placeholder(self):
         wrapper = TextWrapper(width=8)
@@ -831,7 +831,7 @@ class ShortenTestCase(BaseTestCase):
             wrapper.shorten("x" * 20, placeholder="(.......)")
 
     def test_first_word_too_long_but_placeholder_fits(self):
-        self.check_shorten("Helloo", 5, "(...)")
+        self.check_shorten("Helloo", 5, "[...]")
 
 
 if __name__ == '__main__':

Lib/textwrap.py

@@ -19,7 +19,7 @@ __all__ = ['TextWrapper', 'wrap', 'fill', 'dedent', 'indent']
 # since 0xa0 is not in range(128).
 _whitespace = '\t\n\x0b\x0c\r '
 
-_default_placeholder = ' (...)'
+_default_placeholder = ' [...]'
 
 class TextWrapper:
     """
@@ -376,7 +376,7 @@ def shorten(text, width, *, placeholder=_default_placeholder, **kwargs):
         >>> textwrap.shorten("Hello  world!", width=12)
         'Hello world!'
         >>> textwrap.shorten("Hello  world!", width=11)
-        'Hello (...)'
+        'Hello [...]'
     """
     w = TextWrapper(width=width, **kwargs)
     return w.shorten(text, placeholder=placeholder)