diff options
Diffstat (limited to 'Doc/library')
| -rw-r--r-- | Doc/library/ast.rst | 503 |
1 files changed, 211 insertions, 292 deletions
diff --git a/Doc/library/ast.rst b/Doc/library/ast.rst index ea30578..0173564 100644 --- a/Doc/library/ast.rst +++ b/Doc/library/ast.rst @@ -139,12 +139,9 @@ Literals .. doctest:: - >>> print(ast.dump(ast.parse("123"), indent=4)) - Module( - body=[ - Expr( - value=Constant(value=123, kind=None))], - type_ignores=[]) + >>> print(ast.dump(ast.parse('123', mode='eval'), indent=4)) + Expression( + body=Constant(value=123, kind=None)) .. class:: FormattedValue(value, conversion, format_spec) @@ -174,29 +171,26 @@ Literals .. doctest:: - >>> print(ast.dump(ast.parse('f"sin({a}) is {sin(a):.3}"'), indent=4)) - Module( - body=[ - Expr( - value=JoinedStr( - values=[ - Constant(value='sin(', kind=None), - FormattedValue( - value=Name(id='a', ctx=Load()), - conversion=-1, - format_spec=None), - Constant(value=') is ', kind=None), - FormattedValue( - value=Call( - func=Name(id='sin', ctx=Load()), - args=[ - Name(id='a', ctx=Load())], - keywords=[]), - conversion=-1, - format_spec=JoinedStr( - values=[ - Constant(value='.3', kind=None)]))]))], - type_ignores=[]) + >>> print(ast.dump(ast.parse('f"sin({a}) is {sin(a):.3}"', mode='eval'), indent=4)) + Expression( + body=JoinedStr( + values=[ + Constant(value='sin(', kind=None), + FormattedValue( + value=Name(id='a', ctx=Load()), + conversion=-1, + format_spec=None), + Constant(value=') is ', kind=None), + FormattedValue( + value=Call( + func=Name(id='sin', ctx=Load()), + args=[ + Name(id='a', ctx=Load())], + keywords=[]), + conversion=-1, + format_spec=JoinedStr( + values=[ + Constant(value='.3', kind=None)]))])) .. class:: List(elts, ctx) @@ -208,29 +202,22 @@ Literals .. doctest:: - >>> print(ast.dump(ast.parse("[1, 2, 3]"), indent=4)) - Module( - body=[ - Expr( - value=List( - elts=[ - Constant(value=1, kind=None), - Constant(value=2, kind=None), - Constant(value=3, kind=None)], - ctx=Load()))], - type_ignores=[]) - - >>> print(ast.dump(ast.parse("(1, 2, 3)"), indent=4)) - Module( - body=[ - Expr( - value=Tuple( - elts=[ - Constant(value=1, kind=None), - Constant(value=2, kind=None), - Constant(value=3, kind=None)], - ctx=Load()))], - type_ignores=[]) + >>> print(ast.dump(ast.parse('[1, 2, 3]', mode='eval'), indent=4)) + Expression( + body=List( + elts=[ + Constant(value=1, kind=None), + Constant(value=2, kind=None), + Constant(value=3, kind=None)], + ctx=Load())) + >>> print(ast.dump(ast.parse('(1, 2, 3)', mode='eval'), indent=4)) + Expression( + body=Tuple( + elts=[ + Constant(value=1, kind=None), + Constant(value=2, kind=None), + Constant(value=3, kind=None)], + ctx=Load())) .. class:: Set(elts) @@ -239,16 +226,13 @@ Literals .. doctest:: - >>> print(ast.dump(ast.parse("{1, 2, 3}"), indent=4)) - Module( - body=[ - Expr( - value=Set( - elts=[ - Constant(value=1, kind=None), - Constant(value=2, kind=None), - Constant(value=3, kind=None)]))], - type_ignores=[]) + >>> print(ast.dump(ast.parse('{1, 2, 3}', mode='eval'), indent=4)) + Expression( + body=Set( + elts=[ + Constant(value=1, kind=None), + Constant(value=2, kind=None), + Constant(value=3, kind=None)])) .. class:: Dict(keys, values) @@ -263,18 +247,15 @@ Literals .. doctest:: - >>> print(ast.dump(ast.parse("{'a':1, **d}"), indent=4)) - Module( - body=[ - Expr( - value=Dict( - keys=[ - Constant(value='a', kind=None), - None], - values=[ - Constant(value=1, kind=None), - Name(id='d', ctx=Load())]))], - type_ignores=[]) + >>> print(ast.dump(ast.parse('{"a":1, **d}', mode='eval'), indent=4)) + Expression( + body=Dict( + keys=[ + Constant(value='a', kind=None), + None], + values=[ + Constant(value=1, kind=None), + Name(id='d', ctx=Load())])) Variables @@ -385,14 +366,11 @@ Expressions .. doctest:: - >>> print(ast.dump(ast.parse("not x"), indent=4)) - Module( - body=[ - Expr( - value=UnaryOp( - op=Not(), - operand=Name(id='x', ctx=Load())))], - type_ignores=[]) + >>> print(ast.dump(ast.parse('not x', mode='eval'), indent=4)) + Expression( + body=UnaryOp( + op=Not(), + operand=Name(id='x', ctx=Load()))) .. class:: BinOp(left, op, right) @@ -402,15 +380,12 @@ Expressions .. doctest:: - >>> print(ast.dump(ast.parse("x + y"), indent=4)) - Module( - body=[ - Expr( - value=BinOp( - left=Name(id='x', ctx=Load()), - op=Add(), - right=Name(id='y', ctx=Load())))], - type_ignores=[]) + >>> print(ast.dump(ast.parse('x + y', mode='eval'), indent=4)) + Expression( + body=BinOp( + left=Name(id='x', ctx=Load()), + op=Add(), + right=Name(id='y', ctx=Load()))) .. class:: Add @@ -441,16 +416,13 @@ Expressions .. doctest:: - >>> print(ast.dump(ast.parse("x or y"), indent=4)) - Module( - body=[ - Expr( - value=BoolOp( - op=Or(), - values=[ - Name(id='x', ctx=Load()), - Name(id='y', ctx=Load())]))], - type_ignores=[]) + >>> print(ast.dump(ast.parse('x or y', mode='eval'), indent=4)) + Expression( + body=BoolOp( + op=Or(), + values=[ + Name(id='x', ctx=Load()), + Name(id='y', ctx=Load())])) .. class:: And @@ -467,19 +439,16 @@ Expressions .. doctest:: - >>> print(ast.dump(ast.parse("1 < a < 10"), indent=4)) - Module( - body=[ - Expr( - value=Compare( - left=Constant(value=1, kind=None), - ops=[ - Lt(), - Lt()], - comparators=[ - Name(id='a', ctx=Load()), - Constant(value=10, kind=None)]))], - type_ignores=[]) + >>> print(ast.dump(ast.parse('1 <= a < 10', mode='eval'), indent=4)) + Expression( + body=Compare( + left=Constant(value=1, kind=None), + ops=[ + LtE(), + Lt()], + comparators=[ + Name(id='a', ctx=Load()), + Constant(value=10, kind=None)])) .. class:: Eq @@ -510,25 +479,22 @@ Expressions .. doctest:: - >>> print(ast.dump(ast.parse('func(a, b=c, *d, **e)'), indent=4)) - Module( - body=[ - Expr( - value=Call( - func=Name(id='func', ctx=Load()), - args=[ - Name(id='a', ctx=Load()), - Starred( - value=Name(id='d', ctx=Load()), - ctx=Load())], - keywords=[ - keyword( - arg='b', - value=Name(id='c', ctx=Load())), - keyword( - arg=None, - value=Name(id='e', ctx=Load()))]))], - type_ignores=[]) + >>> print(ast.dump(ast.parse('func(a, b=c, *d, **e)', mode='eval'), indent=4)) + Expression( + body=Call( + func=Name(id='func', ctx=Load()), + args=[ + Name(id='a', ctx=Load()), + Starred( + value=Name(id='d', ctx=Load()), + ctx=Load())], + keywords=[ + keyword( + arg='b', + value=Name(id='c', ctx=Load())), + keyword( + arg=None, + value=Name(id='e', ctx=Load()))])) .. class:: keyword(arg, value) @@ -544,15 +510,12 @@ Expressions .. doctest:: - >>> print(ast.dump(ast.parse("a if b else c"), indent=4)) - Module( - body=[ - Expr( - value=IfExp( - test=Name(id='b', ctx=Load()), - body=Name(id='a', ctx=Load()), - orelse=Name(id='c', ctx=Load())))], - type_ignores=[]) + >>> print(ast.dump(ast.parse('a if b else c', mode='eval'), indent=4)) + Expression( + body=IfExp( + test=Name(id='b', ctx=Load()), + body=Name(id='a', ctx=Load()), + orelse=Name(id='c', ctx=Load()))) .. class:: Attribute(value, attr, ctx) @@ -564,15 +527,12 @@ Expressions .. doctest:: - >>> print(ast.dump(ast.parse('snake.colour'), indent=4)) - Module( - body=[ - Expr( - value=Attribute( - value=Name(id='snake', ctx=Load()), - attr='colour', - ctx=Load()))], - type_ignores=[]) + >>> print(ast.dump(ast.parse('snake.colour', mode='eval'), indent=4)) + Expression( + body=Attribute( + value=Name(id='snake', ctx=Load()), + attr='colour', + ctx=Load())) .. class:: NamedExpr(target, value) @@ -584,14 +544,11 @@ Expressions .. doctest:: - >>> print(ast.dump(ast.parse("(x := 4)"), indent=4)) - Module( - body=[ - Expr( - value=NamedExpr( - target=Name(id='x', ctx=Store()), - value=Constant(value=4, kind=None)))], - type_ignores=[]) + >>> print(ast.dump(ast.parse('(x := 4)', mode='eval'), indent=4)) + Expression( + body=NamedExpr( + target=Name(id='x', ctx=Store()), + value=Constant(value=4, kind=None))) Subscripting @@ -611,16 +568,13 @@ Subscripting .. doctest:: - >>> print(ast.dump(ast.parse('l[1]'), indent=4)) - Module( - body=[ - Expr( - value=Subscript( - value=Name(id='l', ctx=Load()), - slice=Index( - value=Constant(value=1, kind=None)), - ctx=Load()))], - type_ignores=[]) + >>> print(ast.dump(ast.parse('l[1]', mode='eval'), indent=4)) + Expression( + body=Subscript( + value=Name(id='l', ctx=Load()), + slice=Index( + value=Constant(value=1, kind=None)), + ctx=Load())) .. class:: Slice(lower, upper, step) @@ -629,18 +583,15 @@ Subscripting .. doctest:: - >>> print(ast.dump(ast.parse('l[1:2]'), indent=4)) - Module( - body=[ - Expr( - value=Subscript( - value=Name(id='l', ctx=Load()), - slice=Slice( - lower=Constant(value=1, kind=None), - upper=Constant(value=2, kind=None), - step=None), - ctx=Load()))], - type_ignores=[]) + >>> print(ast.dump(ast.parse('l[1:2]', mode='eval'), indent=4)) + Expression( + body=Subscript( + value=Name(id='l', ctx=Load()), + slice=Slice( + lower=Constant(value=1, kind=None), + upper=Constant(value=2, kind=None), + step=None), + ctx=Load())) .. class:: ExtSlice(dims) @@ -650,22 +601,19 @@ Subscripting .. doctest:: - >>> print(ast.dump(ast.parse('l[1:2, 3]'), indent=4)) - Module( - body=[ - Expr( - value=Subscript( - value=Name(id='l', ctx=Load()), - slice=ExtSlice( - dims=[ - Slice( - lower=Constant(value=1, kind=None), - upper=Constant(value=2, kind=None), - step=None), - Index( - value=Constant(value=3, kind=None))]), - ctx=Load()))], - type_ignores=[]) + >>> print(ast.dump(ast.parse('l[1:2, 3]', mode='eval'), indent=4)) + Expression( + body=Subscript( + value=Name(id='l', ctx=Load()), + slice=ExtSlice( + dims=[ + Slice( + lower=Constant(value=1, kind=None), + upper=Constant(value=2, kind=None), + step=None), + Index( + value=Constant(value=3, kind=None))]), + ctx=Load())) Comprehensions @@ -684,51 +632,40 @@ Comprehensions .. doctest:: - >>> print(ast.dump(ast.parse("[x for x in numbers]"), indent=4)) - Module( - body=[ - Expr( - value=ListComp( - elt=Name(id='x', ctx=Load()), - generators=[ - comprehension( - target=Name(id='x', ctx=Store()), - iter=Name(id='numbers', ctx=Load()), - ifs=[], - is_async=0)]))], - type_ignores=[]) - - >>> print(ast.dump(ast.parse("{x: x**2 for x in numbers}"), indent=4)) - Module( - body=[ - Expr( - value=DictComp( - key=Name(id='x', ctx=Load()), - value=BinOp( - left=Name(id='x', ctx=Load()), - op=Pow(), - right=Constant(value=2, kind=None)), - generators=[ - comprehension( - target=Name(id='x', ctx=Store()), - iter=Name(id='numbers', ctx=Load()), - ifs=[], - is_async=0)]))], - type_ignores=[]) - - >>> print(ast.dump(ast.parse("{x for x in numbers}"), indent=4)) - Module( - body=[ - Expr( - value=SetComp( - elt=Name(id='x', ctx=Load()), - generators=[ - comprehension( - target=Name(id='x', ctx=Store()), - iter=Name(id='numbers', ctx=Load()), - ifs=[], - is_async=0)]))], - type_ignores=[]) + >>> print(ast.dump(ast.parse('[x for x in numbers]', mode='eval'), indent=4)) + Expression( + body=ListComp( + elt=Name(id='x', ctx=Load()), + generators=[ + comprehension( + target=Name(id='x', ctx=Store()), + iter=Name(id='numbers', ctx=Load()), + ifs=[], + is_async=0)])) + >>> print(ast.dump(ast.parse('{x: x**2 for x in numbers}', mode='eval'), indent=4)) + Expression( + body=DictComp( + key=Name(id='x', ctx=Load()), + value=BinOp( + left=Name(id='x', ctx=Load()), + op=Pow(), + right=Constant(value=2, kind=None)), + generators=[ + comprehension( + target=Name(id='x', ctx=Store()), + iter=Name(id='numbers', ctx=Load()), + ifs=[], + is_async=0)])) + >>> print(ast.dump(ast.parse('{x for x in numbers}', mode='eval'), indent=4)) + Expression( + body=SetComp( + elt=Name(id='x', ctx=Load()), + generators=[ + comprehension( + target=Name(id='x', ctx=Store()), + iter=Name(id='numbers', ctx=Load()), + ifs=[], + is_async=0)])) .. class:: comprehension(target, iter, ifs, is_async) @@ -743,7 +680,7 @@ Comprehensions .. doctest:: - >>> print(ast.dump(ast.parse("[ord(c) for line in file for c in line]", mode='eval'), + >>> print(ast.dump(ast.parse('[ord(c) for line in file for c in line]', mode='eval'), ... indent=4)) # Multiple comprehensions in one. Expression( body=ListComp( @@ -764,7 +701,7 @@ Comprehensions ifs=[], is_async=0)])) - >>> print(ast.dump(ast.parse("(n**2 for n in it if n>5 if n<10)", mode='eval'), + >>> print(ast.dump(ast.parse('(n**2 for n in it if n>5 if n<10)', mode='eval'), ... indent=4)) # generator comprehension Expression( body=GeneratorExp( @@ -791,35 +728,17 @@ Comprehensions Constant(value=10, kind=None)])], is_async=0)])) - >>> print(ast.dump(ast.parse("async def f():" - ... " return [i async for i in soc]"), + >>> print(ast.dump(ast.parse('[i async for i in soc]', mode='eval'), ... indent=4)) # Async comprehension - Module( - body=[ - AsyncFunctionDef( - name='f', - args=arguments( - posonlyargs=[], - args=[], - vararg=None, - kwonlyargs=[], - kw_defaults=[], - kwarg=None, - defaults=[]), - body=[ - Return( - value=ListComp( - elt=Name(id='i', ctx=Load()), - generators=[ - comprehension( - target=Name(id='i', ctx=Store()), - iter=Name(id='soc', ctx=Load()), - ifs=[], - is_async=1)]))], - decorator_list=[], - returns=None, - type_comment=None)], - type_ignores=[]) + Expression( + body=ListComp( + elt=Name(id='i', ctx=Load()), + generators=[ + comprehension( + target=Name(id='i', ctx=Store()), + iter=Name(id='soc', ctx=Load()), + ifs=[], + is_async=1)])) Statements ^^^^^^^^^^ @@ -838,7 +757,7 @@ Statements .. doctest:: - >>> print(ast.dump(ast.parse("a = b = 1"), indent=4)) # Multiple assignment + >>> print(ast.dump(ast.parse('a = b = 1'), indent=4)) # Multiple assignment Module( body=[ Assign( @@ -849,7 +768,7 @@ Statements type_comment=None)], type_ignores=[]) - >>> print(ast.dump(ast.parse("a,b = c"), indent=4)) # Unpacking + >>> print(ast.dump(ast.parse('a,b = c'), indent=4)) # Unpacking Module( body=[ Assign( @@ -875,7 +794,7 @@ Statements .. doctest:: - >>> print(ast.dump(ast.parse("c: int"), indent=4)) + >>> print(ast.dump(ast.parse('c: int'), indent=4)) Module( body=[ AnnAssign( @@ -885,7 +804,7 @@ Statements simple=1)], type_ignores=[]) - >>> print(ast.dump(ast.parse("(a): int = 1"), indent=4)) # Annotation with parenthesis + >>> print(ast.dump(ast.parse('(a): int = 1'), indent=4)) # Annotation with parenthesis Module( body=[ AnnAssign( @@ -895,7 +814,7 @@ Statements simple=0)], type_ignores=[]) - >>> print(ast.dump(ast.parse("a.b: int"), indent=4)) # Attribute annotation + >>> print(ast.dump(ast.parse('a.b: int'), indent=4)) # Attribute annotation Module( body=[ AnnAssign( @@ -908,7 +827,7 @@ Statements simple=0)], type_ignores=[]) - >>> print(ast.dump(ast.parse("a[1]: int"), indent=4)) # Subscript annotation + >>> print(ast.dump(ast.parse('a[1]: int'), indent=4)) # Subscript annotation Module( body=[ AnnAssign( @@ -935,7 +854,7 @@ Statements .. doctest:: - >>> print(ast.dump(ast.parse("x += 2"), indent=4)) + >>> print(ast.dump(ast.parse('x += 2'), indent=4)) Module( body=[ AugAssign( @@ -953,7 +872,7 @@ Statements .. doctest:: - >>> print(ast.dump(ast.parse("raise x from y"), indent=4)) + >>> print(ast.dump(ast.parse('raise x from y'), indent=4)) Module( body=[ Raise( @@ -969,7 +888,7 @@ Statements .. doctest:: - >>> print(ast.dump(ast.parse("assert x,y"), indent=4)) + >>> print(ast.dump(ast.parse('assert x,y'), indent=4)) Module( body=[ Assert( @@ -985,7 +904,7 @@ Statements .. doctest:: - >>> print(ast.dump(ast.parse("del x,y,z"), indent=4)) + >>> print(ast.dump(ast.parse('del x,y,z'), indent=4)) Module( body=[ Delete( @@ -1002,7 +921,7 @@ Statements .. doctest:: - >>> print(ast.dump(ast.parse("pass"), indent=4)) + >>> print(ast.dump(ast.parse('pass'), indent=4)) Module( body=[ Pass()], @@ -1021,7 +940,7 @@ Imports .. doctest:: - >>> print(ast.dump(ast.parse("import x,y,z"), indent=4)) + >>> print(ast.dump(ast.parse('import x,y,z'), indent=4)) Module( body=[ Import( @@ -1041,7 +960,7 @@ Imports .. doctest:: - >>> print(ast.dump(ast.parse("from y import x,y,z"), indent=4)) + >>> print(ast.dump(ast.parse('from y import x,y,z'), indent=4)) Module( body=[ ImportFrom( @@ -1061,7 +980,7 @@ Imports .. doctest:: - >>> print(ast.dump(ast.parse("from ..foo.bar import a as b, c"), indent=4)) + >>> print(ast.dump(ast.parse('from ..foo.bar import a as b, c'), indent=4)) Module( body=[ ImportFrom( @@ -1368,7 +1287,7 @@ Function and class definitions .. doctest:: - >>> print(ast.dump(ast.parse("lambda x,y: ..."), indent=4)) + >>> print(ast.dump(ast.parse('lambda x,y: ...'), indent=4)) Module( body=[ Expr( @@ -1459,7 +1378,7 @@ Function and class definitions .. doctest:: - >>> print(ast.dump(ast.parse("return 4"), indent=4)) + >>> print(ast.dump(ast.parse('return 4'), indent=4)) Module( body=[ Return( @@ -1475,7 +1394,7 @@ Function and class definitions .. doctest:: - >>> print(ast.dump(ast.parse("yield x"), indent=4)) + >>> print(ast.dump(ast.parse('yield x'), indent=4)) Module( body=[ Expr( @@ -1483,7 +1402,7 @@ Function and class definitions value=Name(id='x', ctx=Load())))], type_ignores=[]) - >>> print(ast.dump(ast.parse("yield from x"), indent=4)) + >>> print(ast.dump(ast.parse('yield from x'), indent=4)) Module( body=[ Expr( @@ -1499,7 +1418,7 @@ Function and class definitions .. doctest:: - >>> print(ast.dump(ast.parse("global x,y,z"), indent=4)) + >>> print(ast.dump(ast.parse('global x,y,z'), indent=4)) Module( body=[ Global( @@ -1509,7 +1428,7 @@ Function and class definitions 'z'])], type_ignores=[]) - >>> print(ast.dump(ast.parse("nonlocal x,y,z"), indent=4)) + >>> print(ast.dump(ast.parse('nonlocal x,y,z'), indent=4)) Module( body=[ Nonlocal( |