bpo-37116: Use PEP 570 syntax for positional-only parameters. (GH-13700)

1 files changed, 10 insertions, 19 deletions

diff --git a/Lib/_collections_abc.py b/Lib/_collections_abc.py
index c363987..2b2ddba 100644
--- a/Lib/_collections_abc.py
+++ b/Lib/_collections_abc.py
@@ -821,30 +821,21 @@ class MutableMapping(Mapping):
         except KeyError:
             pass
 
-    def update(*args, **kwds):
+    def update(self, other=(), /, **kwds):
         ''' D.update([E, ]**F) -> None.  Update D from mapping/iterable E and F.
             If E present and has a .keys() method, does:     for k in E: D[k] = E[k]
             If E present and lacks .keys() method, does:     for (k, v) in E: D[k] = v
             In either case, this is followed by: for k, v in F.items(): D[k] = v
         '''
-        if not args:
-            raise TypeError("descriptor 'update' of 'MutableMapping' object "
-                            "needs an argument")
-        self, *args = args
-        if len(args) > 1:
-            raise TypeError('update expected at most 1 arguments, got %d' %
-                            len(args))
-        if args:
-            other = args[0]
-            if isinstance(other, Mapping):
-                for key in other:
-                    self[key] = other[key]
-            elif hasattr(other, "keys"):
-                for key in other.keys():
-                    self[key] = other[key]
-            else:
-                for key, value in other:
-                    self[key] = value
+        if isinstance(other, Mapping):
+            for key in other:
+                self[key] = other[key]
+        elif hasattr(other, "keys"):
+            for key in other.keys():
+                self[key] = other[key]
+        else:
+            for key, value in other:
+                self[key] = value
         for key, value in kwds.items():
             self[key] = value