removed 1st edition code

19-coroutine/yield_from_expansion.py

@@ -1,52 +0,0 @@
-# Code below is the expansion of the statement:
-#
-# RESULT = yield from EXPR
-#
-# Copied verbatim from the Formal Semantics section of
-# PEP 380 -- Syntax for Delegating to a Subgenerator
-#
-# https://www.python.org/dev/peps/pep-0380/#formal-semantics
-
-
-# BEGIN YIELD_FROM_EXPANSION
-_i = iter(EXPR)  # <1>
-try:
-    _y = next(_i)  # <2>
-except StopIteration as _e:
-    _r = _e.value  # <3>
-else:
-    while 1:  # <4>
-        try:
-            _s = yield _y  # <5>
-        except GeneratorExit as _e:  # <6>
-            try:
-                _m = _i.close
-            except AttributeError:
-                pass
-            else:
-                _m()
-            raise _e
-        except BaseException as _e:  # <7>
-            _x = sys.exc_info()
-            try:
-                _m = _i.throw
-            except AttributeError:
-                raise _e
-            else:  # <8>
-                try:
-                    _y = _m(*_x)
-                except StopIteration as _e:
-                    _r = _e.value
-                    break
-        else:  # <9>
-            try:  # <10>
-                if _s is None:  # <11>
-                    _y = next(_i)
-                else:
-                    _y = _i.send(_s)
-            except StopIteration as _e:  # <12>
-                _r = _e.value
-                break
-
-RESULT = _r  # <13>
-# END YIELD_FROM_EXPANSION