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                <textarea name="file_content" style="width:100%; height:400px; font-family:monospace;"># Grammar for 2to3. This grammar supports Python 2.x and 3.x.

# NOTE WELL: You should also follow all the steps listed at
# https://devguide.python.org/grammar/

# Start symbols for the grammar:
#	file_input is a module or sequence of commands read from an input file;
#	single_input is a single interactive statement;
#	eval_input is the input for the eval() and input() functions.
# NB: compound_stmt in single_input is followed by extra NEWLINE!
file_input: (NEWLINE | stmt)* ENDMARKER
single_input: NEWLINE | simple_stmt | compound_stmt NEWLINE
eval_input: testlist NEWLINE* ENDMARKER

decorator: &#039;@&#039; dotted_name [ &#039;(&#039; [arglist] &#039;)&#039; ] NEWLINE
decorators: decorator+
decorated: decorators (classdef | funcdef | async_funcdef)
async_funcdef: ASYNC funcdef
funcdef: &#039;def&#039; NAME parameters [&#039;-&gt;&#039; test] &#039;:&#039; suite
parameters: &#039;(&#039; [typedargslist] &#039;)&#039;
typedargslist: ((tfpdef [&#039;=&#039; test] &#039;,&#039;)*
                (&#039;*&#039; [tname] (&#039;,&#039; tname [&#039;=&#039; test])* [&#039;,&#039; [&#039;**&#039; tname [&#039;,&#039;]]] | &#039;**&#039; tname [&#039;,&#039;])
                | tfpdef [&#039;=&#039; test] (&#039;,&#039; tfpdef [&#039;=&#039; test])* [&#039;,&#039;])
tname: NAME [&#039;:&#039; test]
tfpdef: tname | &#039;(&#039; tfplist &#039;)&#039;
tfplist: tfpdef (&#039;,&#039; tfpdef)* [&#039;,&#039;]
varargslist: ((vfpdef [&#039;=&#039; test] &#039;,&#039;)*
              (&#039;*&#039; [vname] (&#039;,&#039; vname [&#039;=&#039; test])*  [&#039;,&#039; [&#039;**&#039; vname [&#039;,&#039;]]] | &#039;**&#039; vname [&#039;,&#039;])
              | vfpdef [&#039;=&#039; test] (&#039;,&#039; vfpdef [&#039;=&#039; test])* [&#039;,&#039;])
vname: NAME
vfpdef: vname | &#039;(&#039; vfplist &#039;)&#039;
vfplist: vfpdef (&#039;,&#039; vfpdef)* [&#039;,&#039;]

stmt: simple_stmt | compound_stmt
simple_stmt: small_stmt (&#039;;&#039; small_stmt)* [&#039;;&#039;] NEWLINE
small_stmt: (expr_stmt | print_stmt  | del_stmt | pass_stmt | flow_stmt |
             import_stmt | global_stmt | exec_stmt | assert_stmt)
expr_stmt: testlist_star_expr (annassign | augassign (yield_expr|testlist) |
                     (&#039;=&#039; (yield_expr|testlist_star_expr))*)
annassign: &#039;:&#039; test [&#039;=&#039; test]
testlist_star_expr: (test|star_expr) (&#039;,&#039; (test|star_expr))* [&#039;,&#039;]
augassign: (&#039;+=&#039; | &#039;-=&#039; | &#039;*=&#039; | &#039;@=&#039; | &#039;/=&#039; | &#039;%=&#039; | &#039;&amp;=&#039; | &#039;|=&#039; | &#039;^=&#039; |
            &#039;&lt;&lt;=&#039; | &#039;&gt;&gt;=&#039; | &#039;**=&#039; | &#039;//=&#039;)
# For normal and annotated assignments, additional restrictions enforced by the interpreter
print_stmt: &#039;print&#039; ( [ test (&#039;,&#039; test)* [&#039;,&#039;] ] |
                      &#039;&gt;&gt;&#039; test [ (&#039;,&#039; test)+ [&#039;,&#039;] ] )
del_stmt: &#039;del&#039; exprlist
pass_stmt: &#039;pass&#039;
flow_stmt: break_stmt | continue_stmt | return_stmt | raise_stmt | yield_stmt
break_stmt: &#039;break&#039;
continue_stmt: &#039;continue&#039;
return_stmt: &#039;return&#039; [testlist]
yield_stmt: yield_expr
raise_stmt: &#039;raise&#039; [test [&#039;from&#039; test | &#039;,&#039; test [&#039;,&#039; test]]]
import_stmt: import_name | import_from
import_name: &#039;import&#039; dotted_as_names
import_from: (&#039;from&#039; (&#039;.&#039;* dotted_name | &#039;.&#039;+)
              &#039;import&#039; (&#039;*&#039; | &#039;(&#039; import_as_names &#039;)&#039; | import_as_names))
import_as_name: NAME [&#039;as&#039; NAME]
dotted_as_name: dotted_name [&#039;as&#039; NAME]
import_as_names: import_as_name (&#039;,&#039; import_as_name)* [&#039;,&#039;]
dotted_as_names: dotted_as_name (&#039;,&#039; dotted_as_name)*
dotted_name: NAME (&#039;.&#039; NAME)*
global_stmt: (&#039;global&#039; | &#039;nonlocal&#039;) NAME (&#039;,&#039; NAME)*
exec_stmt: &#039;exec&#039; expr [&#039;in&#039; test [&#039;,&#039; test]]
assert_stmt: &#039;assert&#039; test [&#039;,&#039; test]

compound_stmt: if_stmt | while_stmt | for_stmt | try_stmt | with_stmt | funcdef | classdef | decorated | async_stmt
async_stmt: ASYNC (funcdef | with_stmt | for_stmt)
if_stmt: &#039;if&#039; test &#039;:&#039; suite (&#039;elif&#039; test &#039;:&#039; suite)* [&#039;else&#039; &#039;:&#039; suite]
while_stmt: &#039;while&#039; test &#039;:&#039; suite [&#039;else&#039; &#039;:&#039; suite]
for_stmt: &#039;for&#039; exprlist &#039;in&#039; testlist &#039;:&#039; suite [&#039;else&#039; &#039;:&#039; suite]
try_stmt: (&#039;try&#039; &#039;:&#039; suite
           ((except_clause &#039;:&#039; suite)+
	    [&#039;else&#039; &#039;:&#039; suite]
	    [&#039;finally&#039; &#039;:&#039; suite] |
	   &#039;finally&#039; &#039;:&#039; suite))
with_stmt: &#039;with&#039; with_item (&#039;,&#039; with_item)*  &#039;:&#039; suite
with_item: test [&#039;as&#039; expr]
with_var: &#039;as&#039; expr
# NB compile.c makes sure that the default except clause is last
except_clause: &#039;except&#039; [test [(&#039;,&#039; | &#039;as&#039;) test]]
suite: simple_stmt | NEWLINE INDENT stmt+ DEDENT

# Backward compatibility cruft to support:
# [ x for x in lambda: True, lambda: False if x() ]
# even while also allowing:
# lambda x: 5 if x else 2
# (But not a mix of the two)
testlist_safe: old_test [(&#039;,&#039; old_test)+ [&#039;,&#039;]]
old_test: or_test | old_lambdef
old_lambdef: &#039;lambda&#039; [varargslist] &#039;:&#039; old_test

test: or_test [&#039;if&#039; or_test &#039;else&#039; test] | lambdef
or_test: and_test (&#039;or&#039; and_test)*
and_test: not_test (&#039;and&#039; not_test)*
not_test: &#039;not&#039; not_test | comparison
comparison: expr (comp_op expr)*
comp_op: &#039;&lt;&#039;|&#039;&gt;&#039;|&#039;==&#039;|&#039;&gt;=&#039;|&#039;&lt;=&#039;|&#039;&lt;&gt;&#039;|&#039;!=&#039;|&#039;in&#039;|&#039;not&#039; &#039;in&#039;|&#039;is&#039;|&#039;is&#039; &#039;not&#039;
star_expr: &#039;*&#039; expr
expr: xor_expr (&#039;|&#039; xor_expr)*
xor_expr: and_expr (&#039;^&#039; and_expr)*
and_expr: shift_expr (&#039;&amp;&#039; shift_expr)*
shift_expr: arith_expr ((&#039;&lt;&lt;&#039;|&#039;&gt;&gt;&#039;) arith_expr)*
arith_expr: term ((&#039;+&#039;|&#039;-&#039;) term)*
term: factor ((&#039;*&#039;|&#039;@&#039;|&#039;/&#039;|&#039;%&#039;|&#039;//&#039;) factor)*
factor: (&#039;+&#039;|&#039;-&#039;|&#039;~&#039;) factor | power
power: [AWAIT] atom trailer* [&#039;**&#039; factor]
atom: (&#039;(&#039; [yield_expr|testlist_gexp] &#039;)&#039; |
       &#039;[&#039; [listmaker] &#039;]&#039; |
       &#039;{&#039; [dictsetmaker] &#039;}&#039; |
       &#039;`&#039; testlist1 &#039;`&#039; |
       NAME | NUMBER | STRING+ | &#039;.&#039; &#039;.&#039; &#039;.&#039;)
listmaker: (test|star_expr) ( comp_for | (&#039;,&#039; (test|star_expr))* [&#039;,&#039;] )
testlist_gexp: (test|star_expr) ( comp_for | (&#039;,&#039; (test|star_expr))* [&#039;,&#039;] )
lambdef: &#039;lambda&#039; [varargslist] &#039;:&#039; test
trailer: &#039;(&#039; [arglist] &#039;)&#039; | &#039;[&#039; subscriptlist &#039;]&#039; | &#039;.&#039; NAME
subscriptlist: subscript (&#039;,&#039; subscript)* [&#039;,&#039;]
subscript: test | [test] &#039;:&#039; [test] [sliceop]
sliceop: &#039;:&#039; [test]
exprlist: (expr|star_expr) (&#039;,&#039; (expr|star_expr))* [&#039;,&#039;]
testlist: test (&#039;,&#039; test)* [&#039;,&#039;]
dictsetmaker: ( ((test &#039;:&#039; test | &#039;**&#039; expr)
                 (comp_for | (&#039;,&#039; (test &#039;:&#039; test | &#039;**&#039; expr))* [&#039;,&#039;])) |
                ((test | star_expr)
		 (comp_for | (&#039;,&#039; (test | star_expr))* [&#039;,&#039;])) )

classdef: &#039;class&#039; NAME [&#039;(&#039; [arglist] &#039;)&#039;] &#039;:&#039; suite

arglist: argument (&#039;,&#039; argument)* [&#039;,&#039;]

# &quot;test &#039;=&#039; test&quot; is really &quot;keyword &#039;=&#039; test&quot;, but we have no such token.
# These need to be in a single rule to avoid grammar that is ambiguous
# to our LL(1) parser. Even though &#039;test&#039; includes &#039;*expr&#039; in star_expr,
# we explicitly match &#039;*&#039; here, too, to give it proper precedence.
# Illegal combinations and orderings are blocked in ast.c:
# multiple (test comp_for) arguments are blocked; keyword unpackings
# that precede iterable unpackings are blocked; etc.
argument: ( test [comp_for] |
            test &#039;=&#039; test |
	    &#039;**&#039; expr |
	    star_expr )

comp_iter: comp_for | comp_if
comp_for: [ASYNC] &#039;for&#039; exprlist &#039;in&#039; testlist_safe [comp_iter]
comp_if: &#039;if&#039; old_test [comp_iter]

testlist1: test (&#039;,&#039; test)*

# not used in grammar, but may appear in &quot;node&quot; passed from Parser to Compiler
encoding_decl: NAME

yield_expr: &#039;yield&#039; [yield_arg]
yield_arg: &#039;from&#039; test | testlist
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