mirror of
https://github.com/python/cpython.git
synced 2024-11-28 12:31:14 +08:00
31f5929c1e
Many tests simply didn't care if they unset a pre-existing trace function. This made test coverage impossible. This patch fixes various tests to put back any pre-existing trace function. It also introduces test.support.no_tracing as a decorator which will temporarily unset the trace function for tests which simply fail otherwise. Thanks to Kristian Vlaardingerbroek for helping to find the cause of various trace function unsets.
723 lines
18 KiB
Python
723 lines
18 KiB
Python
import unittest
|
|
from test.support import check_syntax_error, cpython_only, run_unittest
|
|
|
|
|
|
class ScopeTests(unittest.TestCase):
|
|
|
|
def testSimpleNesting(self):
|
|
|
|
def make_adder(x):
|
|
def adder(y):
|
|
return x + y
|
|
return adder
|
|
|
|
inc = make_adder(1)
|
|
plus10 = make_adder(10)
|
|
|
|
self.assertEqual(inc(1), 2)
|
|
self.assertEqual(plus10(-2), 8)
|
|
|
|
def testExtraNesting(self):
|
|
|
|
def make_adder2(x):
|
|
def extra(): # check freevars passing through non-use scopes
|
|
def adder(y):
|
|
return x + y
|
|
return adder
|
|
return extra()
|
|
|
|
inc = make_adder2(1)
|
|
plus10 = make_adder2(10)
|
|
|
|
self.assertEqual(inc(1), 2)
|
|
self.assertEqual(plus10(-2), 8)
|
|
|
|
def testSimpleAndRebinding(self):
|
|
|
|
def make_adder3(x):
|
|
def adder(y):
|
|
return x + y
|
|
x = x + 1 # check tracking of assignment to x in defining scope
|
|
return adder
|
|
|
|
inc = make_adder3(0)
|
|
plus10 = make_adder3(9)
|
|
|
|
self.assertEqual(inc(1), 2)
|
|
self.assertEqual(plus10(-2), 8)
|
|
|
|
def testNestingGlobalNoFree(self):
|
|
|
|
def make_adder4(): # XXX add exta level of indirection
|
|
def nest():
|
|
def nest():
|
|
def adder(y):
|
|
return global_x + y # check that plain old globals work
|
|
return adder
|
|
return nest()
|
|
return nest()
|
|
|
|
global_x = 1
|
|
adder = make_adder4()
|
|
self.assertEqual(adder(1), 2)
|
|
|
|
global_x = 10
|
|
self.assertEqual(adder(-2), 8)
|
|
|
|
def testNestingThroughClass(self):
|
|
|
|
def make_adder5(x):
|
|
class Adder:
|
|
def __call__(self, y):
|
|
return x + y
|
|
return Adder()
|
|
|
|
inc = make_adder5(1)
|
|
plus10 = make_adder5(10)
|
|
|
|
self.assertEqual(inc(1), 2)
|
|
self.assertEqual(plus10(-2), 8)
|
|
|
|
def testNestingPlusFreeRefToGlobal(self):
|
|
|
|
def make_adder6(x):
|
|
global global_nest_x
|
|
def adder(y):
|
|
return global_nest_x + y
|
|
global_nest_x = x
|
|
return adder
|
|
|
|
inc = make_adder6(1)
|
|
plus10 = make_adder6(10)
|
|
|
|
self.assertEqual(inc(1), 11) # there's only one global
|
|
self.assertEqual(plus10(-2), 8)
|
|
|
|
def testNearestEnclosingScope(self):
|
|
|
|
def f(x):
|
|
def g(y):
|
|
x = 42 # check that this masks binding in f()
|
|
def h(z):
|
|
return x + z
|
|
return h
|
|
return g(2)
|
|
|
|
test_func = f(10)
|
|
self.assertEqual(test_func(5), 47)
|
|
|
|
def testMixedFreevarsAndCellvars(self):
|
|
|
|
def identity(x):
|
|
return x
|
|
|
|
def f(x, y, z):
|
|
def g(a, b, c):
|
|
a = a + x # 3
|
|
def h():
|
|
# z * (4 + 9)
|
|
# 3 * 13
|
|
return identity(z * (b + y))
|
|
y = c + z # 9
|
|
return h
|
|
return g
|
|
|
|
g = f(1, 2, 3)
|
|
h = g(2, 4, 6)
|
|
self.assertEqual(h(), 39)
|
|
|
|
def testFreeVarInMethod(self):
|
|
|
|
def test():
|
|
method_and_var = "var"
|
|
class Test:
|
|
def method_and_var(self):
|
|
return "method"
|
|
def test(self):
|
|
return method_and_var
|
|
def actual_global(self):
|
|
return str("global")
|
|
def str(self):
|
|
return str(self)
|
|
return Test()
|
|
|
|
t = test()
|
|
self.assertEqual(t.test(), "var")
|
|
self.assertEqual(t.method_and_var(), "method")
|
|
self.assertEqual(t.actual_global(), "global")
|
|
|
|
method_and_var = "var"
|
|
class Test:
|
|
# this class is not nested, so the rules are different
|
|
def method_and_var(self):
|
|
return "method"
|
|
def test(self):
|
|
return method_and_var
|
|
def actual_global(self):
|
|
return str("global")
|
|
def str(self):
|
|
return str(self)
|
|
|
|
t = Test()
|
|
self.assertEqual(t.test(), "var")
|
|
self.assertEqual(t.method_and_var(), "method")
|
|
self.assertEqual(t.actual_global(), "global")
|
|
|
|
def testCellIsKwonlyArg(self):
|
|
# Issue 1409: Initialisation of a cell value,
|
|
# when it comes from a keyword-only parameter
|
|
def foo(*, a=17):
|
|
def bar():
|
|
return a + 5
|
|
return bar() + 3
|
|
|
|
self.assertEqual(foo(a=42), 50)
|
|
self.assertEqual(foo(), 25)
|
|
|
|
def testRecursion(self):
|
|
|
|
def f(x):
|
|
def fact(n):
|
|
if n == 0:
|
|
return 1
|
|
else:
|
|
return n * fact(n - 1)
|
|
if x >= 0:
|
|
return fact(x)
|
|
else:
|
|
raise ValueError("x must be >= 0")
|
|
|
|
self.assertEqual(f(6), 720)
|
|
|
|
|
|
def testUnoptimizedNamespaces(self):
|
|
|
|
check_syntax_error(self, """if 1:
|
|
def unoptimized_clash1(strip):
|
|
def f(s):
|
|
from sys import *
|
|
return getrefcount(s) # ambiguity: free or local
|
|
return f
|
|
""")
|
|
|
|
check_syntax_error(self, """if 1:
|
|
def unoptimized_clash2():
|
|
from sys import *
|
|
def f(s):
|
|
return getrefcount(s) # ambiguity: global or local
|
|
return f
|
|
""")
|
|
|
|
check_syntax_error(self, """if 1:
|
|
def unoptimized_clash2():
|
|
from sys import *
|
|
def g():
|
|
def f(s):
|
|
return getrefcount(s) # ambiguity: global or local
|
|
return f
|
|
""")
|
|
|
|
check_syntax_error(self, """if 1:
|
|
def f():
|
|
def g():
|
|
from sys import *
|
|
return getrefcount # global or local?
|
|
""")
|
|
|
|
def testLambdas(self):
|
|
|
|
f1 = lambda x: lambda y: x + y
|
|
inc = f1(1)
|
|
plus10 = f1(10)
|
|
self.assertEqual(inc(1), 2)
|
|
self.assertEqual(plus10(5), 15)
|
|
|
|
f2 = lambda x: (lambda : lambda y: x + y)()
|
|
inc = f2(1)
|
|
plus10 = f2(10)
|
|
self.assertEqual(inc(1), 2)
|
|
self.assertEqual(plus10(5), 15)
|
|
|
|
f3 = lambda x: lambda y: global_x + y
|
|
global_x = 1
|
|
inc = f3(None)
|
|
self.assertEqual(inc(2), 3)
|
|
|
|
f8 = lambda x, y, z: lambda a, b, c: lambda : z * (b + y)
|
|
g = f8(1, 2, 3)
|
|
h = g(2, 4, 6)
|
|
self.assertEqual(h(), 18)
|
|
|
|
def testUnboundLocal(self):
|
|
|
|
def errorInOuter():
|
|
print(y)
|
|
def inner():
|
|
return y
|
|
y = 1
|
|
|
|
def errorInInner():
|
|
def inner():
|
|
return y
|
|
inner()
|
|
y = 1
|
|
|
|
self.assertRaises(UnboundLocalError, errorInOuter)
|
|
self.assertRaises(NameError, errorInInner)
|
|
|
|
def testUnboundLocal_AfterDel(self):
|
|
# #4617: It is now legal to delete a cell variable.
|
|
# The following functions must obviously compile,
|
|
# and give the correct error when accessing the deleted name.
|
|
def errorInOuter():
|
|
y = 1
|
|
del y
|
|
print(y)
|
|
def inner():
|
|
return y
|
|
|
|
def errorInInner():
|
|
def inner():
|
|
return y
|
|
y = 1
|
|
del y
|
|
inner()
|
|
|
|
self.assertRaises(UnboundLocalError, errorInOuter)
|
|
self.assertRaises(NameError, errorInInner)
|
|
|
|
def testUnboundLocal_AugAssign(self):
|
|
# test for bug #1501934: incorrect LOAD/STORE_GLOBAL generation
|
|
exec("""if 1:
|
|
global_x = 1
|
|
def f():
|
|
global_x += 1
|
|
try:
|
|
f()
|
|
except UnboundLocalError:
|
|
pass
|
|
else:
|
|
fail('scope of global_x not correctly determined')
|
|
""", {'fail': self.fail})
|
|
|
|
def testComplexDefinitions(self):
|
|
|
|
def makeReturner(*lst):
|
|
def returner():
|
|
return lst
|
|
return returner
|
|
|
|
self.assertEqual(makeReturner(1,2,3)(), (1,2,3))
|
|
|
|
def makeReturner2(**kwargs):
|
|
def returner():
|
|
return kwargs
|
|
return returner
|
|
|
|
self.assertEqual(makeReturner2(a=11)()['a'], 11)
|
|
|
|
def testScopeOfGlobalStmt(self):
|
|
# Examples posted by Samuele Pedroni to python-dev on 3/1/2001
|
|
|
|
exec("""if 1:
|
|
# I
|
|
x = 7
|
|
def f():
|
|
x = 1
|
|
def g():
|
|
global x
|
|
def i():
|
|
def h():
|
|
return x
|
|
return h()
|
|
return i()
|
|
return g()
|
|
self.assertEqual(f(), 7)
|
|
self.assertEqual(x, 7)
|
|
|
|
# II
|
|
x = 7
|
|
def f():
|
|
x = 1
|
|
def g():
|
|
x = 2
|
|
def i():
|
|
def h():
|
|
return x
|
|
return h()
|
|
return i()
|
|
return g()
|
|
self.assertEqual(f(), 2)
|
|
self.assertEqual(x, 7)
|
|
|
|
# III
|
|
x = 7
|
|
def f():
|
|
x = 1
|
|
def g():
|
|
global x
|
|
x = 2
|
|
def i():
|
|
def h():
|
|
return x
|
|
return h()
|
|
return i()
|
|
return g()
|
|
self.assertEqual(f(), 2)
|
|
self.assertEqual(x, 2)
|
|
|
|
# IV
|
|
x = 7
|
|
def f():
|
|
x = 3
|
|
def g():
|
|
global x
|
|
x = 2
|
|
def i():
|
|
def h():
|
|
return x
|
|
return h()
|
|
return i()
|
|
return g()
|
|
self.assertEqual(f(), 2)
|
|
self.assertEqual(x, 2)
|
|
|
|
# XXX what about global statements in class blocks?
|
|
# do they affect methods?
|
|
|
|
x = 12
|
|
class Global:
|
|
global x
|
|
x = 13
|
|
def set(self, val):
|
|
x = val
|
|
def get(self):
|
|
return x
|
|
|
|
g = Global()
|
|
self.assertEqual(g.get(), 13)
|
|
g.set(15)
|
|
self.assertEqual(g.get(), 13)
|
|
""")
|
|
|
|
def testLeaks(self):
|
|
|
|
class Foo:
|
|
count = 0
|
|
|
|
def __init__(self):
|
|
Foo.count += 1
|
|
|
|
def __del__(self):
|
|
Foo.count -= 1
|
|
|
|
def f1():
|
|
x = Foo()
|
|
def f2():
|
|
return x
|
|
f2()
|
|
|
|
for i in range(100):
|
|
f1()
|
|
|
|
self.assertEqual(Foo.count, 0)
|
|
|
|
def testClassAndGlobal(self):
|
|
|
|
exec("""if 1:
|
|
def test(x):
|
|
class Foo:
|
|
global x
|
|
def __call__(self, y):
|
|
return x + y
|
|
return Foo()
|
|
|
|
x = 0
|
|
self.assertEqual(test(6)(2), 8)
|
|
x = -1
|
|
self.assertEqual(test(3)(2), 5)
|
|
|
|
looked_up_by_load_name = False
|
|
class X:
|
|
# Implicit globals inside classes are be looked up by LOAD_NAME, not
|
|
# LOAD_GLOBAL.
|
|
locals()['looked_up_by_load_name'] = True
|
|
passed = looked_up_by_load_name
|
|
|
|
self.assertTrue(X.passed)
|
|
""")
|
|
|
|
def testLocalsFunction(self):
|
|
|
|
def f(x):
|
|
def g(y):
|
|
def h(z):
|
|
return y + z
|
|
w = x + y
|
|
y += 3
|
|
return locals()
|
|
return g
|
|
|
|
d = f(2)(4)
|
|
self.assertIn('h', d)
|
|
del d['h']
|
|
self.assertEqual(d, {'x': 2, 'y': 7, 'w': 6})
|
|
|
|
def testLocalsClass(self):
|
|
# This test verifies that calling locals() does not pollute
|
|
# the local namespace of the class with free variables. Old
|
|
# versions of Python had a bug, where a free variable being
|
|
# passed through a class namespace would be inserted into
|
|
# locals() by locals() or exec or a trace function.
|
|
#
|
|
# The real bug lies in frame code that copies variables
|
|
# between fast locals and the locals dict, e.g. when executing
|
|
# a trace function.
|
|
|
|
def f(x):
|
|
class C:
|
|
x = 12
|
|
def m(self):
|
|
return x
|
|
locals()
|
|
return C
|
|
|
|
self.assertEqual(f(1).x, 12)
|
|
|
|
def f(x):
|
|
class C:
|
|
y = x
|
|
def m(self):
|
|
return x
|
|
z = list(locals())
|
|
return C
|
|
|
|
varnames = f(1).z
|
|
self.assertNotIn("x", varnames)
|
|
self.assertIn("y", varnames)
|
|
|
|
@cpython_only
|
|
def testLocalsClass_WithTrace(self):
|
|
# Issue23728: after the trace function returns, the locals()
|
|
# dictionary is used to update all variables, this used to
|
|
# include free variables. But in class statements, free
|
|
# variables are not inserted...
|
|
import sys
|
|
self.addCleanup(sys.settrace, sys.gettrace())
|
|
sys.settrace(lambda a,b,c:None)
|
|
x = 12
|
|
|
|
class C:
|
|
def f(self):
|
|
return x
|
|
|
|
self.assertEqual(x, 12) # Used to raise UnboundLocalError
|
|
|
|
def testBoundAndFree(self):
|
|
# var is bound and free in class
|
|
|
|
def f(x):
|
|
class C:
|
|
def m(self):
|
|
return x
|
|
a = x
|
|
return C
|
|
|
|
inst = f(3)()
|
|
self.assertEqual(inst.a, inst.m())
|
|
|
|
@cpython_only
|
|
def testInteractionWithTraceFunc(self):
|
|
|
|
import sys
|
|
def tracer(a,b,c):
|
|
return tracer
|
|
|
|
def adaptgetter(name, klass, getter):
|
|
kind, des = getter
|
|
if kind == 1: # AV happens when stepping from this line to next
|
|
if des == "":
|
|
des = "_%s__%s" % (klass.__name__, name)
|
|
return lambda obj: getattr(obj, des)
|
|
|
|
class TestClass:
|
|
pass
|
|
|
|
self.addCleanup(sys.settrace, sys.gettrace())
|
|
sys.settrace(tracer)
|
|
adaptgetter("foo", TestClass, (1, ""))
|
|
sys.settrace(None)
|
|
|
|
self.assertRaises(TypeError, sys.settrace)
|
|
|
|
def testEvalExecFreeVars(self):
|
|
|
|
def f(x):
|
|
return lambda: x + 1
|
|
|
|
g = f(3)
|
|
self.assertRaises(TypeError, eval, g.__code__)
|
|
|
|
try:
|
|
exec(g.__code__, {})
|
|
except TypeError:
|
|
pass
|
|
else:
|
|
self.fail("exec should have failed, because code contained free vars")
|
|
|
|
def testListCompLocalVars(self):
|
|
|
|
try:
|
|
print(bad)
|
|
except NameError:
|
|
pass
|
|
else:
|
|
print("bad should not be defined")
|
|
|
|
def x():
|
|
[bad for s in 'a b' for bad in s.split()]
|
|
|
|
x()
|
|
try:
|
|
print(bad)
|
|
except NameError:
|
|
pass
|
|
|
|
def testEvalFreeVars(self):
|
|
|
|
def f(x):
|
|
def g():
|
|
x
|
|
eval("x + 1")
|
|
return g
|
|
|
|
f(4)()
|
|
|
|
def testFreeingCell(self):
|
|
# Test what happens when a finalizer accesses
|
|
# the cell where the object was stored.
|
|
class Special:
|
|
def __del__(self):
|
|
nestedcell_get()
|
|
|
|
def testNonLocalFunction(self):
|
|
|
|
def f(x):
|
|
def inc():
|
|
nonlocal x
|
|
x += 1
|
|
return x
|
|
def dec():
|
|
nonlocal x
|
|
x -= 1
|
|
return x
|
|
return inc, dec
|
|
|
|
inc, dec = f(0)
|
|
self.assertEqual(inc(), 1)
|
|
self.assertEqual(inc(), 2)
|
|
self.assertEqual(dec(), 1)
|
|
self.assertEqual(dec(), 0)
|
|
|
|
def testNonLocalMethod(self):
|
|
def f(x):
|
|
class c:
|
|
def inc(self):
|
|
nonlocal x
|
|
x += 1
|
|
return x
|
|
def dec(self):
|
|
nonlocal x
|
|
x -= 1
|
|
return x
|
|
return c()
|
|
c = f(0)
|
|
self.assertEqual(c.inc(), 1)
|
|
self.assertEqual(c.inc(), 2)
|
|
self.assertEqual(c.dec(), 1)
|
|
self.assertEqual(c.dec(), 0)
|
|
|
|
def testGlobalInParallelNestedFunctions(self):
|
|
# A symbol table bug leaked the global statement from one
|
|
# function to other nested functions in the same block.
|
|
# This test verifies that a global statement in the first
|
|
# function does not affect the second function.
|
|
local_ns = {}
|
|
global_ns = {}
|
|
exec("""if 1:
|
|
def f():
|
|
y = 1
|
|
def g():
|
|
global y
|
|
return y
|
|
def h():
|
|
return y + 1
|
|
return g, h
|
|
y = 9
|
|
g, h = f()
|
|
result9 = g()
|
|
result2 = h()
|
|
""", local_ns, global_ns)
|
|
self.assertEqual(2, global_ns["result2"])
|
|
self.assertEqual(9, global_ns["result9"])
|
|
|
|
def testNonLocalClass(self):
|
|
|
|
def f(x):
|
|
class c:
|
|
nonlocal x
|
|
x += 1
|
|
def get(self):
|
|
return x
|
|
return c()
|
|
|
|
c = f(0)
|
|
self.assertEqual(c.get(), 1)
|
|
self.assertNotIn("x", c.__class__.__dict__)
|
|
|
|
|
|
def testNonLocalGenerator(self):
|
|
|
|
def f(x):
|
|
def g(y):
|
|
nonlocal x
|
|
for i in range(y):
|
|
x += 1
|
|
yield x
|
|
return g
|
|
|
|
g = f(0)
|
|
self.assertEqual(list(g(5)), [1, 2, 3, 4, 5])
|
|
|
|
def testNestedNonLocal(self):
|
|
|
|
def f(x):
|
|
def g():
|
|
nonlocal x
|
|
x -= 2
|
|
def h():
|
|
nonlocal x
|
|
x += 4
|
|
return x
|
|
return h
|
|
return g
|
|
|
|
g = f(1)
|
|
h = g()
|
|
self.assertEqual(h(), 3)
|
|
|
|
def testTopIsNotSignificant(self):
|
|
# See #9997.
|
|
def top(a):
|
|
pass
|
|
def b():
|
|
global a
|
|
|
|
|
|
|
|
def test_main():
|
|
run_unittest(ScopeTests)
|
|
|
|
if __name__ == '__main__':
|
|
test_main()
|