bpo-36540: PEP 570 -- Implementation (GH-12701)

This commit contains the implementation of PEP570: Python positional-only parameters.

* Update Grammar/Grammar with new typedarglist and varargslist

* Regenerate grammar files

* Update and regenerate AST related files

* Update code object

* Update marshal.c

* Update compiler and symtable

* Regenerate importlib files

* Update callable objects

* Implement positional-only args logic in ceval.c

* Regenerate frozen data

* Update standard library to account for positional-only args

* Add test file for positional-only args

* Update other test files to account for positional-only args

* Add News entry

* Update inspect module and related tests

1 files changed, 26 insertions, 2 deletions

diff --git a/Lib/test/test_code.py b/Lib/test/test_code.py
index 55faf4c427..e49121ef16 100644
--- a/Lib/test/test_code.py
+++ b/Lib/test/test_code.py
@@ -9,6 +9,7 @@
 >>> dump(f.__code__)
 name: f
 argcount: 1
+posonlyargcount: 0
 kwonlyargcount: 0
 names: ()
 varnames: ('x', 'g')
@@ -21,6 +22,7 @@ consts: ('None', '<code object g>', "'f.<locals>.g'")
 >>> dump(f(4).__code__)
 name: g
 argcount: 1
+posonlyargcount: 0
 kwonlyargcount: 0
 names: ()
 varnames: ('y',)
@@ -40,6 +42,7 @@ consts: ('None',)
 >>> dump(h.__code__)
 name: h
 argcount: 2
+posonlyargcount: 0
 kwonlyargcount: 0
 names: ()
 varnames: ('x', 'y', 'a', 'b', 'c')
@@ -57,6 +60,7 @@ consts: ('None',)
 >>> dump(attrs.__code__)
 name: attrs
 argcount: 1
+posonlyargcount: 0
 kwonlyargcount: 0
 names: ('print', 'attr1', 'attr2', 'attr3')
 varnames: ('obj',)
@@ -75,6 +79,7 @@ consts: ('None',)
 >>> dump(optimize_away.__code__)
 name: optimize_away
 argcount: 0
+posonlyargcount: 0
 kwonlyargcount: 0
 names: ()
 varnames: ()
@@ -91,6 +96,7 @@ consts: ("'doc string'", 'None')
 >>> dump(keywordonly_args.__code__)
 name: keywordonly_args
 argcount: 2
+posonlyargcount: 0
 kwonlyargcount: 1
 names: ()
 varnames: ('a', 'b', 'k1')
@@ -100,6 +106,23 @@ nlocals: 3
 flags: 67
 consts: ('None',)
 
+>>> def posonly_args(a,b,/,c):
+...     return a,b,c
+...
+
+>>> dump(posonly_args.__code__)
+name: posonly_args
+argcount: 1
+posonlyargcount: 2
+kwonlyargcount: 0
+names: ()
+varnames: ('a', 'b', 'c')
+cellvars: ()
+freevars: ()
+nlocals: 3
+flags: 67
+consts: ('None',)
+
 """
 
 import inspect
@@ -126,7 +149,8 @@ def consts(t):
 
 def dump(co):
     """Print out a text representation of a code object."""
-    for attr in ["name", "argcount", "kwonlyargcount", "names", "varnames",
+    for attr in ["name", "argcount", "posonlyargcount",
+                 "kwonlyargcount", "names", "varnames",
                  "cellvars", "freevars", "nlocals", "flags"]:
         print("%s: %s" % (attr, getattr(co, "co_" + attr)))
     print("consts:", tuple(consts(co.co_consts)))
@@ -157,7 +181,7 @@ class CodeTest(unittest.TestCase):
         def new_code(c):
             '''A new code object with a __class__ cell added to freevars'''
             return CodeType(
-                c.co_argcount, c.co_kwonlyargcount, c.co_nlocals,
+                c.co_argcount, c.co_posonlyargcount, c.co_kwonlyargcount, c.co_nlocals,
                 c.co_stacksize, c.co_flags, c.co_code, c.co_consts, c.co_names,
                 c.co_varnames, c.co_filename, c.co_name, c.co_firstlineno,
                 c.co_lnotab, c.co_freevars + ('__class__',), c.co_cellvars)