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3053 lines (2709 loc) · 140 KB
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import ast
import builtins
import dis
import enum
import os
import sys
import textwrap
import types
import unittest
import warnings
import weakref
from functools import partial
from textwrap import dedent
from test import support
from test.support.import_helper import import_fresh_module
from test.support import os_helper, script_helper
from test.support.ast_helper import ASTTestMixin
def to_tuple(t):
if t is None or isinstance(t, (str, int, complex)) or t is Ellipsis:
return t
elif isinstance(t, list):
return [to_tuple(e) for e in t]
result = [t.__class__.__name__]
if hasattr(t, 'lineno') and hasattr(t, 'col_offset'):
result.append((t.lineno, t.col_offset))
if hasattr(t, 'end_lineno') and hasattr(t, 'end_col_offset'):
result[-1] += (t.end_lineno, t.end_col_offset)
if t._fields is None:
return tuple(result)
for f in t._fields:
result.append(to_tuple(getattr(t, f)))
return tuple(result)
# These tests are compiled through "exec"
# There should be at least one test per statement
exec_tests = [
# None
"None",
# Module docstring
"'module docstring'",
# FunctionDef
"def f(): pass",
# FunctionDef with docstring
"def f(): 'function docstring'",
# FunctionDef with arg
"def f(a): pass",
# FunctionDef with arg and default value
"def f(a=0): pass",
# FunctionDef with varargs
"def f(*args): pass",
# FunctionDef with varargs as TypeVarTuple
"def f(*args: *Ts): pass",
# FunctionDef with varargs as unpacked Tuple
"def f(*args: *tuple[int, ...]): pass",
# FunctionDef with varargs as unpacked Tuple *and* TypeVarTuple
"def f(*args: *tuple[int, *Ts]): pass",
# FunctionDef with kwargs
"def f(**kwargs): pass",
# FunctionDef with all kind of args and docstring
"def f(a, b=1, c=None, d=[], e={}, *args, f=42, **kwargs): 'doc for f()'",
# FunctionDef with type annotation on return involving unpacking
"def f() -> tuple[*Ts]: pass",
"def f() -> tuple[int, *Ts]: pass",
"def f() -> tuple[int, *tuple[int, ...]]: pass",
# ClassDef
"class C:pass",
# ClassDef with docstring
"class C: 'docstring for class C'",
# ClassDef, new style class
"class C(object): pass",
# Return
"def f():return 1",
# Delete
"del v",
# Assign
"v = 1",
"a,b = c",
"(a,b) = c",
"[a,b] = c",
# AnnAssign with unpacked types
"x: tuple[*Ts]",
"x: tuple[int, *Ts]",
"x: tuple[int, *tuple[str, ...]]",
# AugAssign
"v += 1",
# For
"for v in v:pass",
# While
"while v:pass",
# If
"if v:pass",
# If-Elif
"if a:\n pass\nelif b:\n pass",
# If-Elif-Else
"if a:\n pass\nelif b:\n pass\nelse:\n pass",
# With
"with x as y: pass",
"with x as y, z as q: pass",
# Raise
"raise Exception('string')",
# TryExcept
"try:\n pass\nexcept Exception:\n pass",
# TryFinally
"try:\n pass\nfinally:\n pass",
# TryStarExcept
"try:\n pass\nexcept* Exception:\n pass",
# Assert
"assert v",
# Import
"import sys",
# ImportFrom
"from sys import v",
# Global
"global v",
# Expr
"1",
# Pass,
"pass",
# Break
"for v in v:break",
# Continue
"for v in v:continue",
# for statements with naked tuples (see http://bugs.python.org/issue6704)
"for a,b in c: pass",
"for (a,b) in c: pass",
"for [a,b] in c: pass",
# Multiline generator expression (test for .lineno & .col_offset)
"""(
(
Aa
,
Bb
)
for
Aa
,
Bb in Cc
)""",
# dictcomp
"{a : b for w in x for m in p if g}",
# dictcomp with naked tuple
"{a : b for v,w in x}",
# setcomp
"{r for l in x if g}",
# setcomp with naked tuple
"{r for l,m in x}",
# AsyncFunctionDef
"async def f():\n 'async function'\n await something()",
# AsyncFor
"async def f():\n async for e in i: 1\n else: 2",
# AsyncWith
"async def f():\n async with a as b: 1",
# PEP 448: Additional Unpacking Generalizations
"{**{1:2}, 2:3}",
"{*{1, 2}, 3}",
# Asynchronous comprehensions
"async def f():\n [i async for b in c]",
# Decorated FunctionDef
"@deco1\n@deco2()\n@deco3(1)\ndef f(): pass",
# Decorated AsyncFunctionDef
"@deco1\n@deco2()\n@deco3(1)\nasync def f(): pass",
# Decorated ClassDef
"@deco1\n@deco2()\n@deco3(1)\nclass C: pass",
# Decorator with generator argument
"@deco(a for a in b)\ndef f(): pass",
# Decorator with attribute
"@a.b.c\ndef f(): pass",
# Simple assignment expression
"(a := 1)",
# Positional-only arguments
"def f(a, /,): pass",
"def f(a, /, c, d, e): pass",
"def f(a, /, c, *, d, e): pass",
"def f(a, /, c, *, d, e, **kwargs): pass",
# Positional-only arguments with defaults
"def f(a=1, /,): pass",
"def f(a=1, /, b=2, c=4): pass",
"def f(a=1, /, b=2, *, c=4): pass",
"def f(a=1, /, b=2, *, c): pass",
"def f(a=1, /, b=2, *, c=4, **kwargs): pass",
"def f(a=1, /, b=2, *, c, **kwargs): pass",
# Type aliases
"type X = int",
"type X[T] = int",
"type X[T, *Ts, **P] = (T, Ts, P)",
"type X[T: int, *Ts, **P] = (T, Ts, P)",
"type X[T: (int, str), *Ts, **P] = (T, Ts, P)",
# Generic classes
"class X[T]: pass",
"class X[T, *Ts, **P]: pass",
"class X[T: int, *Ts, **P]: pass",
"class X[T: (int, str), *Ts, **P]: pass",
# Generic functions
"def f[T](): pass",
"def f[T, *Ts, **P](): pass",
"def f[T: int, *Ts, **P](): pass",
"def f[T: (int, str), *Ts, **P](): pass",
]
# These are compiled through "single"
# because of overlap with "eval", it just tests what
# can't be tested with "eval"
single_tests = [
"1+2"
]
# These are compiled through "eval"
# It should test all expressions
eval_tests = [
# None
"None",
# BoolOp
"a and b",
# BinOp
"a + b",
# UnaryOp
"not v",
# Lambda
"lambda:None",
# Dict
"{ 1:2 }",
# Empty dict
"{}",
# Set
"{None,}",
# Multiline dict (test for .lineno & .col_offset)
"""{
1
:
2
}""",
# ListComp
"[a for b in c if d]",
# GeneratorExp
"(a for b in c if d)",
# Comprehensions with multiple for targets
"[(a,b) for a,b in c]",
"[(a,b) for (a,b) in c]",
"[(a,b) for [a,b] in c]",
"{(a,b) for a,b in c}",
"{(a,b) for (a,b) in c}",
"{(a,b) for [a,b] in c}",
"((a,b) for a,b in c)",
"((a,b) for (a,b) in c)",
"((a,b) for [a,b] in c)",
# Yield - yield expressions can't work outside a function
#
# Compare
"1 < 2 < 3",
# Call
"f(1,2,c=3,*d,**e)",
# Call with multi-character starred
"f(*[0, 1])",
# Call with a generator argument
"f(a for a in b)",
# Num
"10",
# Str
"'string'",
# Attribute
"a.b",
# Subscript
"a[b:c]",
# Name
"v",
# List
"[1,2,3]",
# Empty list
"[]",
# Tuple
"1,2,3",
# Tuple
"(1,2,3)",
# Empty tuple
"()",
# Combination
"a.b.c.d(a.b[1:2])",
]
# TODO: expr_context, slice, boolop, operator, unaryop, cmpop, comprehension
# excepthandler, arguments, keywords, alias
class AST_Tests(unittest.TestCase):
maxDiff = None
def _is_ast_node(self, name, node):
if not isinstance(node, type):
return False
if "ast" not in node.__module__:
return False
return name != 'AST' and name[0].isupper()
def _assertTrueorder(self, ast_node, parent_pos):
if not isinstance(ast_node, ast.AST) or ast_node._fields is None:
return
if isinstance(ast_node, (ast.expr, ast.stmt, ast.excepthandler)):
node_pos = (ast_node.lineno, ast_node.col_offset)
self.assertGreaterEqual(node_pos, parent_pos)
parent_pos = (ast_node.lineno, ast_node.col_offset)
for name in ast_node._fields:
value = getattr(ast_node, name)
if isinstance(value, list):
first_pos = parent_pos
if value and name == 'decorator_list':
first_pos = (value[0].lineno, value[0].col_offset)
for child in value:
self._assertTrueorder(child, first_pos)
elif value is not None:
self._assertTrueorder(value, parent_pos)
self.assertEqual(ast_node._fields, ast_node.__match_args__)
def test_AST_objects(self):
x = ast.AST()
self.assertEqual(x._fields, ())
x.foobar = 42
self.assertEqual(x.foobar, 42)
self.assertEqual(x.__dict__["foobar"], 42)
with self.assertRaises(AttributeError):
x.vararg
with self.assertRaises(TypeError):
# "ast.AST constructor takes 0 positional arguments"
ast.AST(2)
def test_AST_garbage_collection(self):
class X:
pass
a = ast.AST()
a.x = X()
a.x.a = a
ref = weakref.ref(a.x)
del a
support.gc_collect()
self.assertIsNone(ref())
def test_snippets(self):
for input, output, kind in ((exec_tests, exec_results, "exec"),
(single_tests, single_results, "single"),
(eval_tests, eval_results, "eval")):
for i, o in zip(input, output):
with self.subTest(action="parsing", input=i):
ast_tree = compile(i, "?", kind, ast.PyCF_ONLY_AST)
self.assertEqual(to_tuple(ast_tree), o)
self._assertTrueorder(ast_tree, (0, 0))
with self.subTest(action="compiling", input=i, kind=kind):
compile(ast_tree, "?", kind)
def test_ast_validation(self):
# compile() is the only function that calls PyAST_Validate
snippets_to_validate = exec_tests + single_tests + eval_tests
for snippet in snippets_to_validate:
tree = ast.parse(snippet)
compile(tree, '<string>', 'exec')
def test_invalid_position_information(self):
invalid_linenos = [
(10, 1), (-10, -11), (10, -11), (-5, -2), (-5, 1)
]
for lineno, end_lineno in invalid_linenos:
with self.subTest(f"Check invalid linenos {lineno}:{end_lineno}"):
snippet = "a = 1"
tree = ast.parse(snippet)
tree.body[0].lineno = lineno
tree.body[0].end_lineno = end_lineno
with self.assertRaises(ValueError):
compile(tree, '<string>', 'exec')
invalid_col_offsets = [
(10, 1), (-10, -11), (10, -11), (-5, -2), (-5, 1)
]
for col_offset, end_col_offset in invalid_col_offsets:
with self.subTest(f"Check invalid col_offset {col_offset}:{end_col_offset}"):
snippet = "a = 1"
tree = ast.parse(snippet)
tree.body[0].col_offset = col_offset
tree.body[0].end_col_offset = end_col_offset
with self.assertRaises(ValueError):
compile(tree, '<string>', 'exec')
def test_compilation_of_ast_nodes_with_default_end_position_values(self):
tree = ast.Module(body=[
ast.Import(names=[ast.alias(name='builtins', lineno=1, col_offset=0)], lineno=1, col_offset=0),
ast.Import(names=[ast.alias(name='traceback', lineno=0, col_offset=0)], lineno=0, col_offset=1)
], type_ignores=[])
# Check that compilation doesn't crash. Note: this may crash explicitly only on debug mode.
compile(tree, "<string>", "exec")
def test_slice(self):
slc = ast.parse("x[::]").body[0].value.slice
self.assertIsNone(slc.upper)
self.assertIsNone(slc.lower)
self.assertIsNone(slc.step)
def test_from_import(self):
im = ast.parse("from . import y").body[0]
self.assertIsNone(im.module)
def test_non_interned_future_from_ast(self):
mod = ast.parse("from __future__ import division")
self.assertIsInstance(mod.body[0], ast.ImportFrom)
mod.body[0].module = " __future__ ".strip()
compile(mod, "<test>", "exec")
def test_alias(self):
im = ast.parse("from bar import y").body[0]
self.assertEqual(len(im.names), 1)
alias = im.names[0]
self.assertEqual(alias.name, 'y')
self.assertIsNone(alias.asname)
self.assertEqual(alias.lineno, 1)
self.assertEqual(alias.end_lineno, 1)
self.assertEqual(alias.col_offset, 16)
self.assertEqual(alias.end_col_offset, 17)
im = ast.parse("from bar import *").body[0]
alias = im.names[0]
self.assertEqual(alias.name, '*')
self.assertIsNone(alias.asname)
self.assertEqual(alias.lineno, 1)
self.assertEqual(alias.end_lineno, 1)
self.assertEqual(alias.col_offset, 16)
self.assertEqual(alias.end_col_offset, 17)
im = ast.parse("from bar import y as z").body[0]
alias = im.names[0]
self.assertEqual(alias.name, "y")
self.assertEqual(alias.asname, "z")
self.assertEqual(alias.lineno, 1)
self.assertEqual(alias.end_lineno, 1)
self.assertEqual(alias.col_offset, 16)
self.assertEqual(alias.end_col_offset, 22)
im = ast.parse("import bar as foo").body[0]
alias = im.names[0]
self.assertEqual(alias.name, "bar")
self.assertEqual(alias.asname, "foo")
self.assertEqual(alias.lineno, 1)
self.assertEqual(alias.end_lineno, 1)
self.assertEqual(alias.col_offset, 7)
self.assertEqual(alias.end_col_offset, 17)
def test_base_classes(self):
self.assertTrue(issubclass(ast.For, ast.stmt))
self.assertTrue(issubclass(ast.Name, ast.expr))
self.assertTrue(issubclass(ast.stmt, ast.AST))
self.assertTrue(issubclass(ast.expr, ast.AST))
self.assertTrue(issubclass(ast.comprehension, ast.AST))
self.assertTrue(issubclass(ast.Gt, ast.AST))
def test_import_deprecated(self):
ast = import_fresh_module('ast')
depr_regex = (
r'ast\.{} is deprecated and will be removed in Python 3.14; '
r'use ast\.Constant instead'
)
for name in 'Num', 'Str', 'Bytes', 'NameConstant', 'Ellipsis':
with self.assertWarnsRegex(DeprecationWarning, depr_regex.format(name)):
getattr(ast, name)
def test_field_attr_existence_deprecated(self):
with warnings.catch_warnings():
warnings.filterwarnings('ignore', '', DeprecationWarning)
from ast import Num, Str, Bytes, NameConstant, Ellipsis
for name in ('Num', 'Str', 'Bytes', 'NameConstant', 'Ellipsis'):
item = getattr(ast, name)
if self._is_ast_node(name, item):
with self.subTest(item):
with self.assertWarns(DeprecationWarning):
x = item()
if isinstance(x, ast.AST):
self.assertIs(type(x._fields), tuple)
def test_field_attr_existence(self):
for name, item in ast.__dict__.items():
# These emit DeprecationWarnings
if name in {'Num', 'Str', 'Bytes', 'NameConstant', 'Ellipsis'}:
continue
# constructor has a different signature
if name == 'Index':
continue
if self._is_ast_node(name, item):
x = item()
if isinstance(x, ast.AST):
self.assertIs(type(x._fields), tuple)
def test_arguments(self):
x = ast.arguments()
self.assertEqual(x._fields, ('posonlyargs', 'args', 'vararg', 'kwonlyargs',
'kw_defaults', 'kwarg', 'defaults'))
with self.assertRaises(AttributeError):
x.args
self.assertIsNone(x.vararg)
x = ast.arguments(*range(1, 8))
self.assertEqual(x.args, 2)
self.assertEqual(x.vararg, 3)
def test_field_attr_writable_deprecated(self):
with warnings.catch_warnings():
warnings.filterwarnings('ignore', '', DeprecationWarning)
x = ast.Num()
# We can assign to _fields
x._fields = 666
self.assertEqual(x._fields, 666)
def test_field_attr_writable(self):
x = ast.Constant()
# We can assign to _fields
x._fields = 666
self.assertEqual(x._fields, 666)
def test_classattrs_deprecated(self):
with warnings.catch_warnings():
warnings.filterwarnings('ignore', '', DeprecationWarning)
from ast import Num, Str, Bytes, NameConstant, Ellipsis
with warnings.catch_warnings(record=True) as wlog:
warnings.filterwarnings('always', '', DeprecationWarning)
x = ast.Num()
self.assertEqual(x._fields, ('value', 'kind'))
with self.assertRaises(AttributeError):
x.value
with self.assertRaises(AttributeError):
x.n
x = ast.Num(42)
self.assertEqual(x.value, 42)
self.assertEqual(x.n, 42)
with self.assertRaises(AttributeError):
x.lineno
with self.assertRaises(AttributeError):
x.foobar
x = ast.Num(lineno=2)
self.assertEqual(x.lineno, 2)
x = ast.Num(42, lineno=0)
self.assertEqual(x.lineno, 0)
self.assertEqual(x._fields, ('value', 'kind'))
self.assertEqual(x.value, 42)
self.assertEqual(x.n, 42)
self.assertRaises(TypeError, ast.Num, 1, None, 2)
self.assertRaises(TypeError, ast.Num, 1, None, 2, lineno=0)
# Arbitrary keyword arguments are supported
self.assertEqual(ast.Num(1, foo='bar').foo, 'bar')
with self.assertRaisesRegex(TypeError, "Num got multiple values for argument 'n'"):
ast.Num(1, n=2)
self.assertEqual(ast.Num(42).n, 42)
self.assertEqual(ast.Num(4.25).n, 4.25)
self.assertEqual(ast.Num(4.25j).n, 4.25j)
self.assertEqual(ast.Str('42').s, '42')
self.assertEqual(ast.Bytes(b'42').s, b'42')
self.assertIs(ast.NameConstant(True).value, True)
self.assertIs(ast.NameConstant(False).value, False)
self.assertIs(ast.NameConstant(None).value, None)
self.assertEqual([str(w.message) for w in wlog], [
'ast.Num is deprecated and will be removed in Python 3.14; use ast.Constant instead',
'Attribute n is deprecated and will be removed in Python 3.14; use value instead',
'ast.Num is deprecated and will be removed in Python 3.14; use ast.Constant instead',
'Attribute n is deprecated and will be removed in Python 3.14; use value instead',
'ast.Num is deprecated and will be removed in Python 3.14; use ast.Constant instead',
'ast.Num is deprecated and will be removed in Python 3.14; use ast.Constant instead',
'Attribute n is deprecated and will be removed in Python 3.14; use value instead',
'ast.Num is deprecated and will be removed in Python 3.14; use ast.Constant instead',
'ast.Num is deprecated and will be removed in Python 3.14; use ast.Constant instead',
'ast.Num is deprecated and will be removed in Python 3.14; use ast.Constant instead',
'ast.Num is deprecated and will be removed in Python 3.14; use ast.Constant instead',
'Attribute n is deprecated and will be removed in Python 3.14; use value instead',
'ast.Num is deprecated and will be removed in Python 3.14; use ast.Constant instead',
'Attribute n is deprecated and will be removed in Python 3.14; use value instead',
'ast.Num is deprecated and will be removed in Python 3.14; use ast.Constant instead',
'Attribute n is deprecated and will be removed in Python 3.14; use value instead',
'ast.Str is deprecated and will be removed in Python 3.14; use ast.Constant instead',
'Attribute s is deprecated and will be removed in Python 3.14; use value instead',
'ast.Bytes is deprecated and will be removed in Python 3.14; use ast.Constant instead',
'Attribute s is deprecated and will be removed in Python 3.14; use value instead',
'ast.NameConstant is deprecated and will be removed in Python 3.14; use ast.Constant instead',
'ast.NameConstant is deprecated and will be removed in Python 3.14; use ast.Constant instead',
'ast.NameConstant is deprecated and will be removed in Python 3.14; use ast.Constant instead',
])
def test_classattrs(self):
x = ast.Constant()
self.assertEqual(x._fields, ('value', 'kind'))
with self.assertRaises(AttributeError):
x.value
x = ast.Constant(42)
self.assertEqual(x.value, 42)
with self.assertRaises(AttributeError):
x.lineno
with self.assertRaises(AttributeError):
x.foobar
x = ast.Constant(lineno=2)
self.assertEqual(x.lineno, 2)
x = ast.Constant(42, lineno=0)
self.assertEqual(x.lineno, 0)
self.assertEqual(x._fields, ('value', 'kind'))
self.assertEqual(x.value, 42)
self.assertRaises(TypeError, ast.Constant, 1, None, 2)
self.assertRaises(TypeError, ast.Constant, 1, None, 2, lineno=0)
# Arbitrary keyword arguments are supported
self.assertEqual(ast.Constant(1, foo='bar').foo, 'bar')
with self.assertRaisesRegex(TypeError, "Constant got multiple values for argument 'value'"):
ast.Constant(1, value=2)
self.assertEqual(ast.Constant(42).value, 42)
self.assertEqual(ast.Constant(4.25).value, 4.25)
self.assertEqual(ast.Constant(4.25j).value, 4.25j)
self.assertEqual(ast.Constant('42').value, '42')
self.assertEqual(ast.Constant(b'42').value, b'42')
self.assertIs(ast.Constant(True).value, True)
self.assertIs(ast.Constant(False).value, False)
self.assertIs(ast.Constant(None).value, None)
self.assertIs(ast.Constant(...).value, ...)
def test_realtype(self):
with warnings.catch_warnings():
warnings.filterwarnings('ignore', '', DeprecationWarning)
from ast import Num, Str, Bytes, NameConstant, Ellipsis
with warnings.catch_warnings(record=True) as wlog:
warnings.filterwarnings('always', '', DeprecationWarning)
self.assertIs(type(ast.Num(42)), ast.Constant)
self.assertIs(type(ast.Num(4.25)), ast.Constant)
self.assertIs(type(ast.Num(4.25j)), ast.Constant)
self.assertIs(type(ast.Str('42')), ast.Constant)
self.assertIs(type(ast.Bytes(b'42')), ast.Constant)
self.assertIs(type(ast.NameConstant(True)), ast.Constant)
self.assertIs(type(ast.NameConstant(False)), ast.Constant)
self.assertIs(type(ast.NameConstant(None)), ast.Constant)
self.assertIs(type(ast.Ellipsis()), ast.Constant)
self.assertEqual([str(w.message) for w in wlog], [
'ast.Num is deprecated and will be removed in Python 3.14; use ast.Constant instead',
'ast.Num is deprecated and will be removed in Python 3.14; use ast.Constant instead',
'ast.Num is deprecated and will be removed in Python 3.14; use ast.Constant instead',
'ast.Str is deprecated and will be removed in Python 3.14; use ast.Constant instead',
'ast.Bytes is deprecated and will be removed in Python 3.14; use ast.Constant instead',
'ast.NameConstant is deprecated and will be removed in Python 3.14; use ast.Constant instead',
'ast.NameConstant is deprecated and will be removed in Python 3.14; use ast.Constant instead',
'ast.NameConstant is deprecated and will be removed in Python 3.14; use ast.Constant instead',
'ast.Ellipsis is deprecated and will be removed in Python 3.14; use ast.Constant instead',
])
def test_isinstance(self):
from ast import Constant
with warnings.catch_warnings():
warnings.filterwarnings('ignore', '', DeprecationWarning)
from ast import Num, Str, Bytes, NameConstant, Ellipsis
cls_depr_msg = (
'ast.{} is deprecated and will be removed in Python 3.14; '
'use ast.Constant instead'
)
assertNumDeprecated = partial(
self.assertWarnsRegex, DeprecationWarning, cls_depr_msg.format("Num")
)
assertStrDeprecated = partial(
self.assertWarnsRegex, DeprecationWarning, cls_depr_msg.format("Str")
)
assertBytesDeprecated = partial(
self.assertWarnsRegex, DeprecationWarning, cls_depr_msg.format("Bytes")
)
assertNameConstantDeprecated = partial(
self.assertWarnsRegex,
DeprecationWarning,
cls_depr_msg.format("NameConstant")
)
assertEllipsisDeprecated = partial(
self.assertWarnsRegex, DeprecationWarning, cls_depr_msg.format("Ellipsis")
)
for arg in 42, 4.2, 4.2j:
with self.subTest(arg=arg):
with assertNumDeprecated():
n = Num(arg)
with assertNumDeprecated():
self.assertIsInstance(n, Num)
with assertStrDeprecated():
s = Str('42')
with assertStrDeprecated():
self.assertIsInstance(s, Str)
with assertBytesDeprecated():
b = Bytes(b'42')
with assertBytesDeprecated():
self.assertIsInstance(b, Bytes)
for arg in True, False, None:
with self.subTest(arg=arg):
with assertNameConstantDeprecated():
n = NameConstant(arg)
with assertNameConstantDeprecated():
self.assertIsInstance(n, NameConstant)
with assertEllipsisDeprecated():
e = Ellipsis()
with assertEllipsisDeprecated():
self.assertIsInstance(e, Ellipsis)
for arg in 42, 4.2, 4.2j:
with self.subTest(arg=arg):
with assertNumDeprecated():
self.assertIsInstance(Constant(arg), Num)
with assertStrDeprecated():
self.assertIsInstance(Constant('42'), Str)
with assertBytesDeprecated():
self.assertIsInstance(Constant(b'42'), Bytes)
for arg in True, False, None:
with self.subTest(arg=arg):
with assertNameConstantDeprecated():
self.assertIsInstance(Constant(arg), NameConstant)
with assertEllipsisDeprecated():
self.assertIsInstance(Constant(...), Ellipsis)
with assertStrDeprecated():
s = Str('42')
assertNumDeprecated(self.assertNotIsInstance, s, Num)
assertBytesDeprecated(self.assertNotIsInstance, s, Bytes)
with assertNumDeprecated():
n = Num(42)
assertStrDeprecated(self.assertNotIsInstance, n, Str)
assertNameConstantDeprecated(self.assertNotIsInstance, n, NameConstant)
assertEllipsisDeprecated(self.assertNotIsInstance, n, Ellipsis)
with assertNameConstantDeprecated():
n = NameConstant(True)
with assertNumDeprecated():
self.assertNotIsInstance(n, Num)
with assertNameConstantDeprecated():
n = NameConstant(False)
with assertNumDeprecated():
self.assertNotIsInstance(n, Num)
for arg in '42', True, False:
with self.subTest(arg=arg):
with assertNumDeprecated():
self.assertNotIsInstance(Constant(arg), Num)
assertStrDeprecated(self.assertNotIsInstance, Constant(42), Str)
assertBytesDeprecated(self.assertNotIsInstance, Constant('42'), Bytes)
assertNameConstantDeprecated(self.assertNotIsInstance, Constant(42), NameConstant)
assertEllipsisDeprecated(self.assertNotIsInstance, Constant(42), Ellipsis)
assertNumDeprecated(self.assertNotIsInstance, Constant(), Num)
assertStrDeprecated(self.assertNotIsInstance, Constant(), Str)
assertBytesDeprecated(self.assertNotIsInstance, Constant(), Bytes)
assertNameConstantDeprecated(self.assertNotIsInstance, Constant(), NameConstant)
assertEllipsisDeprecated(self.assertNotIsInstance, Constant(), Ellipsis)
class S(str): pass
with assertStrDeprecated():
self.assertIsInstance(Constant(S('42')), Str)
with assertNumDeprecated():
self.assertNotIsInstance(Constant(S('42')), Num)
def test_constant_subclasses_deprecated(self):
with warnings.catch_warnings():
warnings.filterwarnings('ignore', '', DeprecationWarning)
from ast import Num
with warnings.catch_warnings(record=True) as wlog:
warnings.filterwarnings('always', '', DeprecationWarning)
class N(ast.Num):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.z = 'spam'
class N2(ast.Num):
pass
n = N(42)
self.assertEqual(n.n, 42)
self.assertEqual(n.z, 'spam')
self.assertIs(type(n), N)
self.assertIsInstance(n, N)
self.assertIsInstance(n, ast.Num)
self.assertNotIsInstance(n, N2)
self.assertNotIsInstance(ast.Num(42), N)
n = N(n=42)
self.assertEqual(n.n, 42)
self.assertIs(type(n), N)
self.assertEqual([str(w.message) for w in wlog], [
'Attribute n is deprecated and will be removed in Python 3.14; use value instead',
'Attribute n is deprecated and will be removed in Python 3.14; use value instead',
'ast.Num is deprecated and will be removed in Python 3.14; use ast.Constant instead',
'ast.Num is deprecated and will be removed in Python 3.14; use ast.Constant instead',
'Attribute n is deprecated and will be removed in Python 3.14; use value instead',
'Attribute n is deprecated and will be removed in Python 3.14; use value instead',
])
def test_constant_subclasses(self):
class N(ast.Constant):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.z = 'spam'
class N2(ast.Constant):
pass
n = N(42)
self.assertEqual(n.value, 42)
self.assertEqual(n.z, 'spam')
self.assertEqual(type(n), N)
self.assertTrue(isinstance(n, N))
self.assertTrue(isinstance(n, ast.Constant))
self.assertFalse(isinstance(n, N2))
self.assertFalse(isinstance(ast.Constant(42), N))
n = N(value=42)
self.assertEqual(n.value, 42)
self.assertEqual(type(n), N)
def test_module(self):
body = [ast.Constant(42)]
x = ast.Module(body, [])
self.assertEqual(x.body, body)
def test_nodeclasses(self):
# Zero arguments constructor explicitly allowed
x = ast.BinOp()
self.assertEqual(x._fields, ('left', 'op', 'right'))
# Random attribute allowed too
x.foobarbaz = 5
self.assertEqual(x.foobarbaz, 5)
n1 = ast.Constant(1)
n3 = ast.Constant(3)
addop = ast.Add()
x = ast.BinOp(n1, addop, n3)
self.assertEqual(x.left, n1)
self.assertEqual(x.op, addop)
self.assertEqual(x.right, n3)
x = ast.BinOp(1, 2, 3)
self.assertEqual(x.left, 1)
self.assertEqual(x.op, 2)
self.assertEqual(x.right, 3)
x = ast.BinOp(1, 2, 3, lineno=0)
self.assertEqual(x.left, 1)
self.assertEqual(x.op, 2)
self.assertEqual(x.right, 3)
self.assertEqual(x.lineno, 0)
# node raises exception when given too many arguments
self.assertRaises(TypeError, ast.BinOp, 1, 2, 3, 4)
# node raises exception when given too many arguments
self.assertRaises(TypeError, ast.BinOp, 1, 2, 3, 4, lineno=0)
# can set attributes through kwargs too
x = ast.BinOp(left=1, op=2, right=3, lineno=0)
self.assertEqual(x.left, 1)
self.assertEqual(x.op, 2)
self.assertEqual(x.right, 3)
self.assertEqual(x.lineno, 0)
# Random kwargs also allowed
x = ast.BinOp(1, 2, 3, foobarbaz=42)
self.assertEqual(x.foobarbaz, 42)
def test_no_fields(self):
# this used to fail because Sub._fields was None
x = ast.Sub()
self.assertEqual(x._fields, ())
def test_pickling(self):
import pickle
for protocol in range(pickle.HIGHEST_PROTOCOL + 1):
for ast in (compile(i, "?", "exec", 0x400) for i in exec_tests):
ast2 = pickle.loads(pickle.dumps(ast, protocol))
self.assertEqual(to_tuple(ast2), to_tuple(ast))
def test_invalid_sum(self):
pos = dict(lineno=2, col_offset=3)
m = ast.Module([ast.Expr(ast.expr(**pos), **pos)], [])
with self.assertRaises(TypeError) as cm:
compile(m, "<test>", "exec")
self.assertIn("but got <ast.expr", str(cm.exception))
def test_invalid_identifier(self):
m = ast.Module([ast.Expr(ast.Name(42, ast.Load()))], [])
ast.fix_missing_locations(m)
with self.assertRaises(TypeError) as cm:
compile(m, "<test>", "exec")
self.assertIn("identifier must be of type str", str(cm.exception))
def test_invalid_constant(self):
for invalid_constant in int, (1, 2, int), frozenset((1, 2, int)):
e = ast.Expression(body=ast.Constant(invalid_constant))
ast.fix_missing_locations(e)
with self.assertRaisesRegex(
TypeError, "invalid type in Constant: type"
):
compile(e, "<test>", "eval")
def test_empty_yield_from(self):
# Issue 16546: yield from value is not optional.
empty_yield_from = ast.parse("def f():\n yield from g()")
empty_yield_from.body[0].body[0].value.value = None
with self.assertRaises(ValueError) as cm:
compile(empty_yield_from, "<test>", "exec")
self.assertIn("field 'value' is required", str(cm.exception))
@support.cpython_only
def test_issue31592(self):
# There shouldn't be an assertion failure in case of a bad
# unicodedata.normalize().
import unicodedata
def bad_normalize(*args):
return None
with support.swap_attr(unicodedata, 'normalize', bad_normalize):
self.assertRaises(TypeError, ast.parse, '\u03D5')
def test_issue18374_binop_col_offset(self):
tree = ast.parse('4+5+6+7')
parent_binop = tree.body[0].value
child_binop = parent_binop.left
grandchild_binop = child_binop.left
self.assertEqual(parent_binop.col_offset, 0)
self.assertEqual(parent_binop.end_col_offset, 7)
self.assertEqual(child_binop.col_offset, 0)
self.assertEqual(child_binop.end_col_offset, 5)
self.assertEqual(grandchild_binop.col_offset, 0)
self.assertEqual(grandchild_binop.end_col_offset, 3)
tree = ast.parse('4+5-\\\n 6-7')
parent_binop = tree.body[0].value
child_binop = parent_binop.left
grandchild_binop = child_binop.left
self.assertEqual(parent_binop.col_offset, 0)
self.assertEqual(parent_binop.lineno, 1)
self.assertEqual(parent_binop.end_col_offset, 4)
self.assertEqual(parent_binop.end_lineno, 2)
self.assertEqual(child_binop.col_offset, 0)
self.assertEqual(child_binop.lineno, 1)
self.assertEqual(child_binop.end_col_offset, 2)
self.assertEqual(child_binop.end_lineno, 2)
self.assertEqual(grandchild_binop.col_offset, 0)
self.assertEqual(grandchild_binop.lineno, 1)
self.assertEqual(grandchild_binop.end_col_offset, 3)
self.assertEqual(grandchild_binop.end_lineno, 1)
def test_issue39579_dotted_name_end_col_offset(self):
tree = ast.parse('@a.b.c\ndef f(): pass')
attr_b = tree.body[0].decorator_list[0].value
self.assertEqual(attr_b.end_col_offset, 4)
def test_ast_asdl_signature(self):
self.assertEqual(ast.withitem.__doc__, "withitem(expr context_expr, expr? optional_vars)")
self.assertEqual(ast.GtE.__doc__, "GtE")
self.assertEqual(ast.Name.__doc__, "Name(identifier id, expr_context ctx)")
self.assertEqual(ast.cmpop.__doc__, "cmpop = Eq | NotEq | Lt | LtE | Gt | GtE | Is | IsNot | In | NotIn")
expressions = [f" | {node.__doc__}" for node in ast.expr.__subclasses__()]
expressions[0] = f"expr = {ast.expr.__subclasses__()[0].__doc__}"
self.assertCountEqual(ast.expr.__doc__.split("\n"), expressions)
def test_positional_only_feature_version(self):
ast.parse('def foo(x, /): ...', feature_version=(3, 8))
ast.parse('def bar(x=1, /): ...', feature_version=(3, 8))
with self.assertRaises(SyntaxError):
ast.parse('def foo(x, /): ...', feature_version=(3, 7))
with self.assertRaises(SyntaxError):
ast.parse('def bar(x=1, /): ...', feature_version=(3, 7))