bpo-40181: Remove '/' reminder in IDLE calltips. (GH-22350)

The marker was added to the language in 3.8 and
3.7 only gets security patches.

Lib/idlelib/NEWS.txt

@@ -3,6 +3,9 @@ Released on 2020-10-05?
 ======================================
 
 
+bpo-40181: In calltips, stop reminding that '/' marks the end of
+positional-only arguments.
+
 bpo-41468: Improve IDLE run crash error message (which users should
 never see).
 

Lib/idlelib/calltip.py

@@ -118,7 +118,6 @@ _INDENT = ' '*4  # for wrapped signatures
 _first_param = re.compile(r'(?<=\()\w*\,?\s*')
 _default_callable_argspec = "See source or doc"
 _invalid_method = "invalid method signature"
-_argument_positional = "  # '/' marks preceding args as positional-only."
 
 def get_argspec(ob):
     '''Return a string describing the signature of a callable object, or ''.
@@ -146,9 +145,6 @@ def get_argspec(ob):
         else:
             argspec = ''
 
-    if '/' in argspec and len(argspec) < _MAX_COLS - len(_argument_positional):
-        # Add explanation TODO remove after 3.7, before 3.9.
-        argspec += _argument_positional
     if isinstance(fob, type) and argspec == '()':
         # If fob has no argument, use default callable argspec.
         argspec = _default_callable_argspec

Lib/idlelib/idle_test/test_calltip.py

@@ -61,18 +61,16 @@ class Get_argspecTest(unittest.TestCase):
 
         if List.__doc__ is not None:
             tiptest(List,
-                    f'(iterable=(), /){calltip._argument_positional}'
+                    f'(iterable=(), /)'
                     f'\n{List.__doc__}')
         tiptest(list.__new__,
               '(*args, **kwargs)\n'
               'Create and return a new object.  '
               'See help(type) for accurate signature.')
         tiptest(list.__init__,
-              '(self, /, *args, **kwargs)'
-              + calltip._argument_positional + '\n' +
+              '(self, /, *args, **kwargs)\n'
               'Initialize self.  See help(type(self)) for accurate signature.')
-        append_doc = (calltip._argument_positional
-                      + "\nAppend object to the end of the list.")
+        append_doc = "\nAppend object to the end of the list."
         tiptest(list.append, '(self, object, /)' + append_doc)
         tiptest(List.append, '(self, object, /)' + append_doc)
         tiptest([].append, '(object, /)' + append_doc)

Misc/NEWS.d/next/IDLE/2020-09-22-00-45-40.bpo-40181.hhQi3z.rst

@@ -0,0 +1,2 @@
+In calltips, stop reminding that '/' marks the end of positional-only
+arguments.