Emily Morehouse | 8f59ee0 | 2019-01-24 16:49:56 -0700 | [diff] [blame] | 1 | import os |
| 2 | import unittest |
| 3 | |
Miss Islington (bot) | 927f07c | 2019-10-14 04:40:15 -0700 | [diff] [blame] | 4 | GLOBAL_VAR = None |
Emily Morehouse | 8f59ee0 | 2019-01-24 16:49:56 -0700 | [diff] [blame] | 5 | |
| 6 | class NamedExpressionInvalidTest(unittest.TestCase): |
| 7 | |
| 8 | def test_named_expression_invalid_01(self): |
| 9 | code = """x := 0""" |
| 10 | |
| 11 | with self.assertRaisesRegex(SyntaxError, "invalid syntax"): |
| 12 | exec(code, {}, {}) |
| 13 | |
| 14 | def test_named_expression_invalid_02(self): |
| 15 | code = """x = y := 0""" |
| 16 | |
| 17 | with self.assertRaisesRegex(SyntaxError, "invalid syntax"): |
| 18 | exec(code, {}, {}) |
| 19 | |
| 20 | def test_named_expression_invalid_03(self): |
| 21 | code = """y := f(x)""" |
| 22 | |
| 23 | with self.assertRaisesRegex(SyntaxError, "invalid syntax"): |
| 24 | exec(code, {}, {}) |
| 25 | |
| 26 | def test_named_expression_invalid_04(self): |
| 27 | code = """y0 = y1 := f(x)""" |
| 28 | |
| 29 | with self.assertRaisesRegex(SyntaxError, "invalid syntax"): |
| 30 | exec(code, {}, {}) |
| 31 | |
| 32 | def test_named_expression_invalid_06(self): |
| 33 | code = """((a, b) := (1, 2))""" |
| 34 | |
| 35 | with self.assertRaisesRegex(SyntaxError, "cannot use named assignment with tuple"): |
| 36 | exec(code, {}, {}) |
| 37 | |
| 38 | def test_named_expression_invalid_07(self): |
| 39 | code = """def spam(a = b := 42): pass""" |
| 40 | |
| 41 | with self.assertRaisesRegex(SyntaxError, "invalid syntax"): |
| 42 | exec(code, {}, {}) |
| 43 | |
| 44 | def test_named_expression_invalid_08(self): |
| 45 | code = """def spam(a: b := 42 = 5): pass""" |
| 46 | |
| 47 | with self.assertRaisesRegex(SyntaxError, "invalid syntax"): |
| 48 | exec(code, {}, {}) |
| 49 | |
| 50 | def test_named_expression_invalid_09(self): |
| 51 | code = """spam(a=b := 'c')""" |
| 52 | |
| 53 | with self.assertRaisesRegex(SyntaxError, "invalid syntax"): |
| 54 | exec(code, {}, {}) |
| 55 | |
| 56 | def test_named_expression_invalid_10(self): |
| 57 | code = """spam(x = y := f(x))""" |
| 58 | |
| 59 | with self.assertRaisesRegex(SyntaxError, "invalid syntax"): |
| 60 | exec(code, {}, {}) |
| 61 | |
| 62 | def test_named_expression_invalid_11(self): |
| 63 | code = """spam(a=1, b := 2)""" |
| 64 | |
| 65 | with self.assertRaisesRegex(SyntaxError, |
| 66 | "positional argument follows keyword argument"): |
| 67 | exec(code, {}, {}) |
| 68 | |
| 69 | def test_named_expression_invalid_12(self): |
| 70 | code = """spam(a=1, (b := 2))""" |
| 71 | |
| 72 | with self.assertRaisesRegex(SyntaxError, |
| 73 | "positional argument follows keyword argument"): |
| 74 | exec(code, {}, {}) |
| 75 | |
| 76 | def test_named_expression_invalid_13(self): |
| 77 | code = """spam(a=1, (b := 2))""" |
| 78 | |
| 79 | with self.assertRaisesRegex(SyntaxError, |
| 80 | "positional argument follows keyword argument"): |
| 81 | exec(code, {}, {}) |
| 82 | |
| 83 | def test_named_expression_invalid_14(self): |
| 84 | code = """(x := lambda: y := 1)""" |
| 85 | |
| 86 | with self.assertRaisesRegex(SyntaxError, "invalid syntax"): |
| 87 | exec(code, {}, {}) |
| 88 | |
| 89 | def test_named_expression_invalid_15(self): |
| 90 | code = """(lambda: x := 1)""" |
| 91 | |
| 92 | with self.assertRaisesRegex(SyntaxError, |
| 93 | "cannot use named assignment with lambda"): |
| 94 | exec(code, {}, {}) |
| 95 | |
| 96 | def test_named_expression_invalid_16(self): |
| 97 | code = "[i + 1 for i in i := [1,2]]" |
| 98 | |
| 99 | with self.assertRaisesRegex(SyntaxError, "invalid syntax"): |
| 100 | exec(code, {}, {}) |
| 101 | |
| 102 | def test_named_expression_invalid_17(self): |
| 103 | code = "[i := 0, j := 1 for i, j in [(1, 2), (3, 4)]]" |
| 104 | |
| 105 | with self.assertRaisesRegex(SyntaxError, "invalid syntax"): |
| 106 | exec(code, {}, {}) |
| 107 | |
Nick Coghlan | 6ca0307 | 2019-08-26 00:41:47 +1000 | [diff] [blame] | 108 | def test_named_expression_invalid_in_class_body(self): |
Emily Morehouse | 8f59ee0 | 2019-01-24 16:49:56 -0700 | [diff] [blame] | 109 | code = """class Foo(): |
| 110 | [(42, 1 + ((( j := i )))) for i in range(5)] |
| 111 | """ |
| 112 | |
Nick Coghlan | 6ca0307 | 2019-08-26 00:41:47 +1000 | [diff] [blame] | 113 | with self.assertRaisesRegex(SyntaxError, |
| 114 | "assignment expression within a comprehension cannot be used in a class body"): |
Emily Morehouse | 8f59ee0 | 2019-01-24 16:49:56 -0700 | [diff] [blame] | 115 | exec(code, {}, {}) |
| 116 | |
Nick Coghlan | 6ca0307 | 2019-08-26 00:41:47 +1000 | [diff] [blame] | 117 | def test_named_expression_invalid_rebinding_comprehension_iteration_variable(self): |
| 118 | cases = [ |
| 119 | ("Local reuse", 'i', "[i := 0 for i in range(5)]"), |
| 120 | ("Nested reuse", 'j', "[[(j := 0) for i in range(5)] for j in range(5)]"), |
| 121 | ("Reuse inner loop target", 'j', "[(j := 0) for i in range(5) for j in range(5)]"), |
| 122 | ("Unpacking reuse", 'i', "[i := 0 for i, j in [(0, 1)]]"), |
| 123 | ("Reuse in loop condition", 'i', "[i+1 for i in range(5) if (i := 0)]"), |
| 124 | ("Unreachable reuse", 'i', "[False or (i:=0) for i in range(5)]"), |
| 125 | ("Unreachable nested reuse", 'i', |
| 126 | "[(i, j) for i in range(5) for j in range(5) if True or (i:=10)]"), |
| 127 | ] |
| 128 | for case, target, code in cases: |
| 129 | msg = f"assignment expression cannot rebind comprehension iteration variable '{target}'" |
| 130 | with self.subTest(case=case): |
| 131 | with self.assertRaisesRegex(SyntaxError, msg): |
| 132 | exec(code, {}, {}) |
| 133 | |
| 134 | def test_named_expression_invalid_rebinding_comprehension_inner_loop(self): |
| 135 | cases = [ |
| 136 | ("Inner reuse", 'j', "[i for i in range(5) if (j := 0) for j in range(5)]"), |
| 137 | ("Inner unpacking reuse", 'j', "[i for i in range(5) if (j := 0) for j, k in [(0, 1)]]"), |
| 138 | ] |
| 139 | for case, target, code in cases: |
| 140 | msg = f"comprehension inner loop cannot rebind assignment expression target '{target}'" |
| 141 | with self.subTest(case=case): |
| 142 | with self.assertRaisesRegex(SyntaxError, msg): |
| 143 | exec(code, {}) # Module scope |
| 144 | with self.assertRaisesRegex(SyntaxError, msg): |
| 145 | exec(code, {}, {}) # Class scope |
| 146 | with self.assertRaisesRegex(SyntaxError, msg): |
| 147 | exec(f"lambda: {code}", {}) # Function scope |
| 148 | |
| 149 | def test_named_expression_invalid_comprehension_iterable_expression(self): |
| 150 | cases = [ |
| 151 | ("Top level", "[i for i in (i := range(5))]"), |
| 152 | ("Inside tuple", "[i for i in (2, 3, i := range(5))]"), |
| 153 | ("Inside list", "[i for i in [2, 3, i := range(5)]]"), |
| 154 | ("Different name", "[i for i in (j := range(5))]"), |
| 155 | ("Lambda expression", "[i for i in (lambda:(j := range(5)))()]"), |
| 156 | ("Inner loop", "[i for i in range(5) for j in (i := range(5))]"), |
| 157 | ("Nested comprehension", "[i for i in [j for j in (k := range(5))]]"), |
| 158 | ("Nested comprehension condition", "[i for i in [j for j in range(5) if (j := True)]]"), |
| 159 | ("Nested comprehension body", "[i for i in [(j := True) for j in range(5)]]"), |
| 160 | ] |
| 161 | msg = "assignment expression cannot be used in a comprehension iterable expression" |
| 162 | for case, code in cases: |
| 163 | with self.subTest(case=case): |
| 164 | with self.assertRaisesRegex(SyntaxError, msg): |
| 165 | exec(code, {}) # Module scope |
| 166 | with self.assertRaisesRegex(SyntaxError, msg): |
| 167 | exec(code, {}, {}) # Class scope |
| 168 | with self.assertRaisesRegex(SyntaxError, msg): |
| 169 | exec(f"lambda: {code}", {}) # Function scope |
| 170 | |
Emily Morehouse | 8f59ee0 | 2019-01-24 16:49:56 -0700 | [diff] [blame] | 171 | |
| 172 | class NamedExpressionAssignmentTest(unittest.TestCase): |
| 173 | |
| 174 | def test_named_expression_assignment_01(self): |
| 175 | (a := 10) |
| 176 | |
| 177 | self.assertEqual(a, 10) |
| 178 | |
| 179 | def test_named_expression_assignment_02(self): |
| 180 | a = 20 |
| 181 | (a := a) |
| 182 | |
| 183 | self.assertEqual(a, 20) |
| 184 | |
| 185 | def test_named_expression_assignment_03(self): |
| 186 | (total := 1 + 2) |
| 187 | |
| 188 | self.assertEqual(total, 3) |
| 189 | |
| 190 | def test_named_expression_assignment_04(self): |
| 191 | (info := (1, 2, 3)) |
| 192 | |
| 193 | self.assertEqual(info, (1, 2, 3)) |
| 194 | |
| 195 | def test_named_expression_assignment_05(self): |
| 196 | (x := 1, 2) |
| 197 | |
| 198 | self.assertEqual(x, 1) |
| 199 | |
| 200 | def test_named_expression_assignment_06(self): |
| 201 | (z := (y := (x := 0))) |
| 202 | |
| 203 | self.assertEqual(x, 0) |
| 204 | self.assertEqual(y, 0) |
| 205 | self.assertEqual(z, 0) |
| 206 | |
| 207 | def test_named_expression_assignment_07(self): |
| 208 | (loc := (1, 2)) |
| 209 | |
| 210 | self.assertEqual(loc, (1, 2)) |
| 211 | |
| 212 | def test_named_expression_assignment_08(self): |
| 213 | if spam := "eggs": |
| 214 | self.assertEqual(spam, "eggs") |
| 215 | else: self.fail("variable was not assigned using named expression") |
| 216 | |
| 217 | def test_named_expression_assignment_09(self): |
| 218 | if True and (spam := True): |
| 219 | self.assertTrue(spam) |
| 220 | else: self.fail("variable was not assigned using named expression") |
| 221 | |
| 222 | def test_named_expression_assignment_10(self): |
Joannah Nanjekye | 075de6c | 2019-02-01 22:58:43 +0300 | [diff] [blame] | 223 | if (match := 10) == 10: |
Emily Morehouse | 8f59ee0 | 2019-01-24 16:49:56 -0700 | [diff] [blame] | 224 | pass |
| 225 | else: self.fail("variable was not assigned using named expression") |
| 226 | |
| 227 | def test_named_expression_assignment_11(self): |
| 228 | def spam(a): |
| 229 | return a |
| 230 | input_data = [1, 2, 3] |
| 231 | res = [(x, y, x/y) for x in input_data if (y := spam(x)) > 0] |
| 232 | |
| 233 | self.assertEqual(res, [(1, 1, 1.0), (2, 2, 1.0), (3, 3, 1.0)]) |
| 234 | |
| 235 | def test_named_expression_assignment_12(self): |
| 236 | def spam(a): |
| 237 | return a |
| 238 | res = [[y := spam(x), x/y] for x in range(1, 5)] |
| 239 | |
| 240 | self.assertEqual(res, [[1, 1.0], [2, 1.0], [3, 1.0], [4, 1.0]]) |
| 241 | |
| 242 | def test_named_expression_assignment_13(self): |
| 243 | length = len(lines := [1, 2]) |
| 244 | |
| 245 | self.assertEqual(length, 2) |
| 246 | self.assertEqual(lines, [1,2]) |
| 247 | |
| 248 | def test_named_expression_assignment_14(self): |
| 249 | """ |
| 250 | Where all variables are positive integers, and a is at least as large |
| 251 | as the n'th root of x, this algorithm returns the floor of the n'th |
| 252 | root of x (and roughly doubling the number of accurate bits per |
Emily Morehouse | ac19081 | 2019-02-01 15:27:38 -0700 | [diff] [blame] | 253 | iteration): |
Emily Morehouse | 8f59ee0 | 2019-01-24 16:49:56 -0700 | [diff] [blame] | 254 | """ |
| 255 | a = 9 |
| 256 | n = 2 |
| 257 | x = 3 |
| 258 | |
| 259 | while a > (d := x // a**(n-1)): |
| 260 | a = ((n-1)*a + d) // n |
| 261 | |
| 262 | self.assertEqual(a, 1) |
| 263 | |
Emily Morehouse | ac19081 | 2019-02-01 15:27:38 -0700 | [diff] [blame] | 264 | def test_named_expression_assignment_15(self): |
| 265 | while a := False: |
| 266 | pass # This will not run |
| 267 | |
| 268 | self.assertEqual(a, False) |
| 269 | |
Miss Islington (bot) | 874ff65 | 2019-06-22 15:34:03 -0700 | [diff] [blame] | 270 | def test_named_expression_assignment_16(self): |
| 271 | a, b = 1, 2 |
| 272 | fib = {(c := a): (a := b) + (b := a + c) - b for __ in range(6)} |
| 273 | self.assertEqual(fib, {1: 2, 2: 3, 3: 5, 5: 8, 8: 13, 13: 21}) |
| 274 | |
Emily Morehouse | 8f59ee0 | 2019-01-24 16:49:56 -0700 | [diff] [blame] | 275 | |
| 276 | class NamedExpressionScopeTest(unittest.TestCase): |
| 277 | |
| 278 | def test_named_expression_scope_01(self): |
| 279 | code = """def spam(): |
| 280 | (a := 5) |
| 281 | print(a)""" |
| 282 | |
| 283 | with self.assertRaisesRegex(NameError, "name 'a' is not defined"): |
| 284 | exec(code, {}, {}) |
| 285 | |
| 286 | def test_named_expression_scope_02(self): |
| 287 | total = 0 |
| 288 | partial_sums = [total := total + v for v in range(5)] |
| 289 | |
| 290 | self.assertEqual(partial_sums, [0, 1, 3, 6, 10]) |
| 291 | self.assertEqual(total, 10) |
| 292 | |
| 293 | def test_named_expression_scope_03(self): |
| 294 | containsOne = any((lastNum := num) == 1 for num in [1, 2, 3]) |
| 295 | |
| 296 | self.assertTrue(containsOne) |
| 297 | self.assertEqual(lastNum, 1) |
| 298 | |
| 299 | def test_named_expression_scope_04(self): |
| 300 | def spam(a): |
| 301 | return a |
| 302 | res = [[y := spam(x), x/y] for x in range(1, 5)] |
| 303 | |
| 304 | self.assertEqual(y, 4) |
| 305 | |
| 306 | def test_named_expression_scope_05(self): |
| 307 | def spam(a): |
| 308 | return a |
| 309 | input_data = [1, 2, 3] |
| 310 | res = [(x, y, x/y) for x in input_data if (y := spam(x)) > 0] |
| 311 | |
| 312 | self.assertEqual(res, [(1, 1, 1.0), (2, 2, 1.0), (3, 3, 1.0)]) |
| 313 | self.assertEqual(y, 3) |
| 314 | |
| 315 | def test_named_expression_scope_06(self): |
| 316 | res = [[spam := i for i in range(3)] for j in range(2)] |
| 317 | |
| 318 | self.assertEqual(res, [[0, 1, 2], [0, 1, 2]]) |
| 319 | self.assertEqual(spam, 2) |
| 320 | |
| 321 | def test_named_expression_scope_07(self): |
| 322 | len(lines := [1, 2]) |
| 323 | |
| 324 | self.assertEqual(lines, [1, 2]) |
| 325 | |
| 326 | def test_named_expression_scope_08(self): |
| 327 | def spam(a): |
| 328 | return a |
| 329 | |
| 330 | def eggs(b): |
| 331 | return b * 2 |
| 332 | |
| 333 | res = [spam(a := eggs(b := h)) for h in range(2)] |
| 334 | |
| 335 | self.assertEqual(res, [0, 2]) |
| 336 | self.assertEqual(a, 2) |
| 337 | self.assertEqual(b, 1) |
| 338 | |
| 339 | def test_named_expression_scope_09(self): |
| 340 | def spam(a): |
| 341 | return a |
| 342 | |
| 343 | def eggs(b): |
| 344 | return b * 2 |
| 345 | |
| 346 | res = [spam(a := eggs(a := h)) for h in range(2)] |
| 347 | |
| 348 | self.assertEqual(res, [0, 2]) |
| 349 | self.assertEqual(a, 2) |
| 350 | |
| 351 | def test_named_expression_scope_10(self): |
| 352 | res = [b := [a := 1 for i in range(2)] for j in range(2)] |
| 353 | |
| 354 | self.assertEqual(res, [[1, 1], [1, 1]]) |
| 355 | self.assertEqual(a, 1) |
| 356 | self.assertEqual(b, [1, 1]) |
| 357 | |
| 358 | def test_named_expression_scope_11(self): |
| 359 | res = [j := i for i in range(5)] |
| 360 | |
| 361 | self.assertEqual(res, [0, 1, 2, 3, 4]) |
| 362 | self.assertEqual(j, 4) |
| 363 | |
Emily Morehouse | 8f59ee0 | 2019-01-24 16:49:56 -0700 | [diff] [blame] | 364 | def test_named_expression_scope_17(self): |
| 365 | b = 0 |
| 366 | res = [b := i + b for i in range(5)] |
| 367 | |
| 368 | self.assertEqual(res, [0, 1, 3, 6, 10]) |
| 369 | self.assertEqual(b, 10) |
| 370 | |
| 371 | def test_named_expression_scope_18(self): |
| 372 | def spam(a): |
| 373 | return a |
| 374 | |
| 375 | res = spam(b := 2) |
| 376 | |
| 377 | self.assertEqual(res, 2) |
| 378 | self.assertEqual(b, 2) |
| 379 | |
| 380 | def test_named_expression_scope_19(self): |
| 381 | def spam(a): |
| 382 | return a |
| 383 | |
| 384 | res = spam((b := 2)) |
| 385 | |
| 386 | self.assertEqual(res, 2) |
| 387 | self.assertEqual(b, 2) |
| 388 | |
| 389 | def test_named_expression_scope_20(self): |
| 390 | def spam(a): |
| 391 | return a |
| 392 | |
| 393 | res = spam(a=(b := 2)) |
| 394 | |
| 395 | self.assertEqual(res, 2) |
| 396 | self.assertEqual(b, 2) |
| 397 | |
| 398 | def test_named_expression_scope_21(self): |
| 399 | def spam(a, b): |
| 400 | return a + b |
| 401 | |
| 402 | res = spam(c := 2, b=1) |
| 403 | |
| 404 | self.assertEqual(res, 3) |
| 405 | self.assertEqual(c, 2) |
| 406 | |
| 407 | def test_named_expression_scope_22(self): |
| 408 | def spam(a, b): |
| 409 | return a + b |
| 410 | |
| 411 | res = spam((c := 2), b=1) |
| 412 | |
| 413 | self.assertEqual(res, 3) |
| 414 | self.assertEqual(c, 2) |
| 415 | |
| 416 | def test_named_expression_scope_23(self): |
| 417 | def spam(a, b): |
| 418 | return a + b |
| 419 | |
| 420 | res = spam(b=(c := 2), a=1) |
| 421 | |
| 422 | self.assertEqual(res, 3) |
| 423 | self.assertEqual(c, 2) |
| 424 | |
| 425 | def test_named_expression_scope_24(self): |
| 426 | a = 10 |
| 427 | def spam(): |
| 428 | nonlocal a |
| 429 | (a := 20) |
| 430 | spam() |
| 431 | |
| 432 | self.assertEqual(a, 20) |
| 433 | |
| 434 | def test_named_expression_scope_25(self): |
| 435 | ns = {} |
| 436 | code = """a = 10 |
| 437 | def spam(): |
| 438 | global a |
| 439 | (a := 20) |
| 440 | spam()""" |
| 441 | |
| 442 | exec(code, ns, {}) |
| 443 | |
| 444 | self.assertEqual(ns["a"], 20) |
| 445 | |
Nick Coghlan | 6ca0307 | 2019-08-26 00:41:47 +1000 | [diff] [blame] | 446 | def test_named_expression_variable_reuse_in_comprehensions(self): |
| 447 | # The compiler is expected to raise syntax error for comprehension |
| 448 | # iteration variables, but should be fine with rebinding of other |
| 449 | # names (e.g. globals, nonlocals, other assignment expressions) |
| 450 | |
| 451 | # The cases are all defined to produce the same expected result |
| 452 | # Each comprehension is checked at both function scope and module scope |
| 453 | rebinding = "[x := i for i in range(3) if (x := i) or not x]" |
| 454 | filter_ref = "[x := i for i in range(3) if x or not x]" |
| 455 | body_ref = "[x for i in range(3) if (x := i) or not x]" |
| 456 | nested_ref = "[j for i in range(3) if x or not x for j in range(3) if (x := i)][:-3]" |
| 457 | cases = [ |
| 458 | ("Rebind global", f"x = 1; result = {rebinding}"), |
| 459 | ("Rebind nonlocal", f"result, x = (lambda x=1: ({rebinding}, x))()"), |
| 460 | ("Filter global", f"x = 1; result = {filter_ref}"), |
| 461 | ("Filter nonlocal", f"result, x = (lambda x=1: ({filter_ref}, x))()"), |
| 462 | ("Body global", f"x = 1; result = {body_ref}"), |
| 463 | ("Body nonlocal", f"result, x = (lambda x=1: ({body_ref}, x))()"), |
| 464 | ("Nested global", f"x = 1; result = {nested_ref}"), |
| 465 | ("Nested nonlocal", f"result, x = (lambda x=1: ({nested_ref}, x))()"), |
| 466 | ] |
| 467 | for case, code in cases: |
| 468 | with self.subTest(case=case): |
| 469 | ns = {} |
| 470 | exec(code, ns) |
| 471 | self.assertEqual(ns["x"], 2) |
| 472 | self.assertEqual(ns["result"], [0, 1, 2]) |
Emily Morehouse | 8f59ee0 | 2019-01-24 16:49:56 -0700 | [diff] [blame] | 473 | |
Miss Islington (bot) | 927f07c | 2019-10-14 04:40:15 -0700 | [diff] [blame] | 474 | def test_named_expression_global_scope(self): |
| 475 | sentinel = object() |
| 476 | global GLOBAL_VAR |
| 477 | def f(): |
| 478 | global GLOBAL_VAR |
| 479 | [GLOBAL_VAR := sentinel for _ in range(1)] |
| 480 | self.assertEqual(GLOBAL_VAR, sentinel) |
| 481 | try: |
| 482 | f() |
| 483 | self.assertEqual(GLOBAL_VAR, sentinel) |
| 484 | finally: |
| 485 | GLOBAL_VAR = None |
| 486 | |
| 487 | def test_named_expression_global_scope_no_global_keyword(self): |
| 488 | sentinel = object() |
| 489 | def f(): |
| 490 | GLOBAL_VAR = None |
| 491 | [GLOBAL_VAR := sentinel for _ in range(1)] |
| 492 | self.assertEqual(GLOBAL_VAR, sentinel) |
| 493 | f() |
| 494 | self.assertEqual(GLOBAL_VAR, None) |
| 495 | |
| 496 | def test_named_expression_nonlocal_scope(self): |
| 497 | sentinel = object() |
| 498 | def f(): |
| 499 | nonlocal_var = None |
| 500 | def g(): |
| 501 | nonlocal nonlocal_var |
| 502 | [nonlocal_var := sentinel for _ in range(1)] |
| 503 | g() |
| 504 | self.assertEqual(nonlocal_var, sentinel) |
| 505 | f() |
| 506 | |
| 507 | def test_named_expression_nonlocal_scope_no_nonlocal_keyword(self): |
| 508 | sentinel = object() |
| 509 | def f(): |
| 510 | nonlocal_var = None |
| 511 | def g(): |
| 512 | [nonlocal_var := sentinel for _ in range(1)] |
| 513 | g() |
| 514 | self.assertEqual(nonlocal_var, None) |
| 515 | f() |
| 516 | |
| 517 | |
Emily Morehouse | 8f59ee0 | 2019-01-24 16:49:56 -0700 | [diff] [blame] | 518 | if __name__ == "__main__": |
| 519 | unittest.main() |