| """Unit tests for the keyword only argument specified in PEP 3102.""" |
| |
| __author__ = "Jiwon Seo" |
| __email__ = "seojiwon at gmail dot com" |
| |
| import unittest |
| |
| def posonly_sum(pos_arg1, *arg, **kwarg): |
| return pos_arg1 + sum(arg) + sum(kwarg.values()) |
| def keywordonly_sum(*, k1=0, k2): |
| return k1 + k2 |
| def keywordonly_nodefaults_sum(*, k1, k2): |
| return k1 + k2 |
| def keywordonly_and_kwarg_sum(*, k1, k2, **kwarg): |
| return k1 + k2 + sum(kwarg.values()) |
| def mixedargs_sum(a, b=0, *arg, k1, k2=0): |
| return a + b + k1 + k2 + sum(arg) |
| def mixedargs_sum2(a, b=0, *arg, k1, k2=0, **kwargs): |
| return a + b + k1 + k2 + sum(arg) + sum(kwargs.values()) |
| |
| def sortnum(*nums, reverse=False): |
| return sorted(list(nums), reverse=reverse) |
| |
| def sortwords(*words, reverse=False, **kwargs): |
| return sorted(list(words), reverse=reverse) |
| |
| class Foo: |
| def __init__(self, *, k1, k2=0): |
| self.k1 = k1 |
| self.k2 = k2 |
| def set(self, p1, *, k1, k2): |
| self.k1 = k1 |
| self.k2 = k2 |
| def sum(self): |
| return self.k1 + self.k2 |
| |
| class KeywordOnlyArgTestCase(unittest.TestCase): |
| def assertRaisesSyntaxError(self, codestr): |
| def shouldRaiseSyntaxError(s): |
| compile(s, "<test>", "single") |
| self.assertRaises(SyntaxError, shouldRaiseSyntaxError, codestr) |
| |
| def testSyntaxErrorForFunctionDefinition(self): |
| self.assertRaisesSyntaxError("def f(p, *):\n pass\n") |
| self.assertRaisesSyntaxError("def f(p1, *, p1=100):\n pass\n") |
| self.assertRaisesSyntaxError("def f(p1, *k1, k1=100):\n pass\n") |
| self.assertRaisesSyntaxError("def f(p1, *, k1, k1=100):\n pass\n") |
| self.assertRaisesSyntaxError("def f(p1, *, **k1):\n pass\n") |
| self.assertRaisesSyntaxError("def f(p1, *, k1, **k1):\n pass\n") |
| self.assertRaisesSyntaxError("def f(p1, *, None, **k1):\n pass\n") |
| self.assertRaisesSyntaxError("def f(p, *, (k1, k2), **kw):\n pass\n") |
| |
| def testSyntaxForManyArguments(self): |
| fundef = "def f(" |
| for i in range(255): |
| fundef += "i%d, "%i |
| fundef += "*, key=100):\n pass\n" |
| self.assertRaisesSyntaxError(fundef) |
| |
| fundef2 = "def foo(i,*," |
| for i in range(255): |
| fundef2 += "i%d, "%i |
| fundef2 += "lastarg):\n pass\n" |
| self.assertRaisesSyntaxError(fundef2) |
| |
| # exactly 255 arguments, should compile ok |
| fundef3 = "def f(i,*," |
| for i in range(253): |
| fundef3 += "i%d, "%i |
| fundef3 += "lastarg):\n pass\n" |
| compile(fundef3, "<test>", "single") |
| |
| def testTooManyPositionalErrorMessage(self): |
| def f(a, b=None, *, c=None): |
| pass |
| with self.assertRaises(TypeError) as exc: |
| f(1, 2, 3) |
| expected = "f() takes from 1 to 2 positional arguments but 3 were given" |
| self.assertEqual(str(exc.exception), expected) |
| |
| def testSyntaxErrorForFunctionCall(self): |
| self.assertRaisesSyntaxError("f(p, k=1, p2)") |
| self.assertRaisesSyntaxError("f(p, k1=50, *(1,2), k1=100)") |
| |
| def testRaiseErrorFuncallWithUnexpectedKeywordArgument(self): |
| self.assertRaises(TypeError, keywordonly_sum, ()) |
| self.assertRaises(TypeError, keywordonly_nodefaults_sum, ()) |
| self.assertRaises(TypeError, Foo, ()) |
| try: |
| keywordonly_sum(k2=100, non_existing_arg=200) |
| self.fail("should raise TypeError") |
| except TypeError: |
| pass |
| try: |
| keywordonly_nodefaults_sum(k2=2) |
| self.fail("should raise TypeError") |
| except TypeError: |
| pass |
| |
| def testFunctionCall(self): |
| self.assertEqual(1, posonly_sum(1)) |
| self.assertEqual(1+2, posonly_sum(1,**{"2":2})) |
| self.assertEqual(1+2+3, posonly_sum(1,*(2,3))) |
| self.assertEqual(1+2+3+4, posonly_sum(1,*(2,3),**{"4":4})) |
| |
| self.assertEqual(1, keywordonly_sum(k2=1)) |
| self.assertEqual(1+2, keywordonly_sum(k1=1, k2=2)) |
| |
| self.assertEqual(1+2, keywordonly_and_kwarg_sum(k1=1, k2=2)) |
| self.assertEqual(1+2+3, keywordonly_and_kwarg_sum(k1=1, k2=2, k3=3)) |
| self.assertEqual(1+2+3+4, |
| keywordonly_and_kwarg_sum(k1=1, k2=2, |
| **{"a":3,"b":4})) |
| |
| self.assertEqual(1+2, mixedargs_sum(1, k1=2)) |
| self.assertEqual(1+2+3, mixedargs_sum(1, 2, k1=3)) |
| self.assertEqual(1+2+3+4, mixedargs_sum(1, 2, k1=3, k2=4)) |
| self.assertEqual(1+2+3+4+5, mixedargs_sum(1, 2, 3, k1=4, k2=5)) |
| |
| self.assertEqual(1+2, mixedargs_sum2(1, k1=2)) |
| self.assertEqual(1+2+3, mixedargs_sum2(1, 2, k1=3)) |
| self.assertEqual(1+2+3+4, mixedargs_sum2(1, 2, k1=3, k2=4)) |
| self.assertEqual(1+2+3+4+5, mixedargs_sum2(1, 2, 3, k1=4, k2=5)) |
| self.assertEqual(1+2+3+4+5+6, |
| mixedargs_sum2(1, 2, 3, k1=4, k2=5, k3=6)) |
| self.assertEqual(1+2+3+4+5+6, |
| mixedargs_sum2(1, 2, 3, k1=4, **{'k2':5, 'k3':6})) |
| |
| self.assertEqual(1, Foo(k1=1).sum()) |
| self.assertEqual(1+2, Foo(k1=1,k2=2).sum()) |
| |
| self.assertEqual([1,2,3], sortnum(3,2,1)) |
| self.assertEqual([3,2,1], sortnum(1,2,3, reverse=True)) |
| |
| self.assertEqual(['a','b','c'], sortwords('a','c','b')) |
| self.assertEqual(['c','b','a'], sortwords('a','c','b', reverse=True)) |
| self.assertEqual(['c','b','a'], |
| sortwords('a','c','b', reverse=True, ignore='ignore')) |
| |
| def testKwDefaults(self): |
| def foo(p1,p2=0, *, k1, k2=0): |
| return p1 + p2 + k1 + k2 |
| |
| self.assertEqual(2, foo.__code__.co_kwonlyargcount) |
| self.assertEqual({"k2":0}, foo.__kwdefaults__) |
| foo.__kwdefaults__ = {"k1":0} |
| try: |
| foo(1,k1=10) |
| self.fail("__kwdefaults__ is not properly changed") |
| except TypeError: |
| pass |
| |
| def test_kwonly_methods(self): |
| class Example: |
| def f(self, *, k1=1, k2=2): |
| return k1, k2 |
| |
| self.assertEqual(Example().f(k1=1, k2=2), (1, 2)) |
| self.assertEqual(Example.f(Example(), k1=1, k2=2), (1, 2)) |
| self.assertRaises(TypeError, Example.f, k1=1, k2=2) |
| |
| def test_issue13343(self): |
| # The Python compiler must scan all symbols of a function to |
| # determine their scope: global, local, cell... |
| # This was not done for the default values of keyword |
| # arguments in a lambda definition, and the following line |
| # used to fail with a SystemError. |
| lambda *, k1=unittest: None |
| |
| def test_mangling(self): |
| class X: |
| def f(self, *, __a=42): |
| return __a |
| self.assertEqual(X().f(), 42) |
| |
| def test_default_evaluation_order(self): |
| # See issue 16967 |
| a = 42 |
| with self.assertRaises(NameError) as err: |
| def f(v=a, x=b, *, y=c, z=d): |
| pass |
| self.assertEqual(str(err.exception), "name 'b' is not defined") |
| with self.assertRaises(NameError) as err: |
| f = lambda v=a, x=b, *, y=c, z=d: None |
| self.assertEqual(str(err.exception), "name 'b' is not defined") |
| |
| |
| if __name__ == "__main__": |
| unittest.main() |