Emily Morehouse | 8f59ee0 | 2019-01-24 16:49:56 -0700 | [diff] [blame] | 1 | import os |
| 2 | import unittest |
| 3 | |
| 4 | |
| 5 | class NamedExpressionInvalidTest(unittest.TestCase): |
| 6 | |
| 7 | def test_named_expression_invalid_01(self): |
| 8 | code = """x := 0""" |
| 9 | |
| 10 | with self.assertRaisesRegex(SyntaxError, "invalid syntax"): |
| 11 | exec(code, {}, {}) |
| 12 | |
| 13 | def test_named_expression_invalid_02(self): |
| 14 | code = """x = y := 0""" |
| 15 | |
| 16 | with self.assertRaisesRegex(SyntaxError, "invalid syntax"): |
| 17 | exec(code, {}, {}) |
| 18 | |
| 19 | def test_named_expression_invalid_03(self): |
| 20 | code = """y := f(x)""" |
| 21 | |
| 22 | with self.assertRaisesRegex(SyntaxError, "invalid syntax"): |
| 23 | exec(code, {}, {}) |
| 24 | |
| 25 | def test_named_expression_invalid_04(self): |
| 26 | code = """y0 = y1 := f(x)""" |
| 27 | |
| 28 | with self.assertRaisesRegex(SyntaxError, "invalid syntax"): |
| 29 | exec(code, {}, {}) |
| 30 | |
| 31 | def test_named_expression_invalid_06(self): |
| 32 | code = """((a, b) := (1, 2))""" |
| 33 | |
| 34 | with self.assertRaisesRegex(SyntaxError, "cannot use named assignment with tuple"): |
| 35 | exec(code, {}, {}) |
| 36 | |
| 37 | def test_named_expression_invalid_07(self): |
| 38 | code = """def spam(a = b := 42): pass""" |
| 39 | |
| 40 | with self.assertRaisesRegex(SyntaxError, "invalid syntax"): |
| 41 | exec(code, {}, {}) |
| 42 | |
| 43 | def test_named_expression_invalid_08(self): |
| 44 | code = """def spam(a: b := 42 = 5): pass""" |
| 45 | |
| 46 | with self.assertRaisesRegex(SyntaxError, "invalid syntax"): |
| 47 | exec(code, {}, {}) |
| 48 | |
| 49 | def test_named_expression_invalid_09(self): |
| 50 | code = """spam(a=b := 'c')""" |
| 51 | |
| 52 | with self.assertRaisesRegex(SyntaxError, "invalid syntax"): |
| 53 | exec(code, {}, {}) |
| 54 | |
| 55 | def test_named_expression_invalid_10(self): |
| 56 | code = """spam(x = y := f(x))""" |
| 57 | |
| 58 | with self.assertRaisesRegex(SyntaxError, "invalid syntax"): |
| 59 | exec(code, {}, {}) |
| 60 | |
| 61 | def test_named_expression_invalid_11(self): |
| 62 | code = """spam(a=1, b := 2)""" |
| 63 | |
| 64 | with self.assertRaisesRegex(SyntaxError, |
| 65 | "positional argument follows keyword argument"): |
| 66 | exec(code, {}, {}) |
| 67 | |
| 68 | def test_named_expression_invalid_12(self): |
| 69 | code = """spam(a=1, (b := 2))""" |
| 70 | |
| 71 | with self.assertRaisesRegex(SyntaxError, |
| 72 | "positional argument follows keyword argument"): |
| 73 | exec(code, {}, {}) |
| 74 | |
| 75 | def test_named_expression_invalid_13(self): |
| 76 | code = """spam(a=1, (b := 2))""" |
| 77 | |
| 78 | with self.assertRaisesRegex(SyntaxError, |
| 79 | "positional argument follows keyword argument"): |
| 80 | exec(code, {}, {}) |
| 81 | |
| 82 | def test_named_expression_invalid_14(self): |
| 83 | code = """(x := lambda: y := 1)""" |
| 84 | |
| 85 | with self.assertRaisesRegex(SyntaxError, "invalid syntax"): |
| 86 | exec(code, {}, {}) |
| 87 | |
| 88 | def test_named_expression_invalid_15(self): |
| 89 | code = """(lambda: x := 1)""" |
| 90 | |
| 91 | with self.assertRaisesRegex(SyntaxError, |
| 92 | "cannot use named assignment with lambda"): |
| 93 | exec(code, {}, {}) |
| 94 | |
| 95 | def test_named_expression_invalid_16(self): |
| 96 | code = "[i + 1 for i in i := [1,2]]" |
| 97 | |
| 98 | with self.assertRaisesRegex(SyntaxError, "invalid syntax"): |
| 99 | exec(code, {}, {}) |
| 100 | |
| 101 | def test_named_expression_invalid_17(self): |
| 102 | code = "[i := 0, j := 1 for i, j in [(1, 2), (3, 4)]]" |
| 103 | |
| 104 | with self.assertRaisesRegex(SyntaxError, "invalid syntax"): |
| 105 | exec(code, {}, {}) |
| 106 | |
| 107 | def test_named_expression_invalid_18(self): |
| 108 | code = """class Foo(): |
| 109 | [(42, 1 + ((( j := i )))) for i in range(5)] |
| 110 | """ |
| 111 | |
| 112 | with self.assertRaisesRegex(TargetScopeError, |
| 113 | "named expression within a comprehension cannot be used in a class body"): |
| 114 | exec(code, {}, {}) |
| 115 | |
| 116 | |
| 117 | class NamedExpressionAssignmentTest(unittest.TestCase): |
| 118 | |
| 119 | def test_named_expression_assignment_01(self): |
| 120 | (a := 10) |
| 121 | |
| 122 | self.assertEqual(a, 10) |
| 123 | |
| 124 | def test_named_expression_assignment_02(self): |
| 125 | a = 20 |
| 126 | (a := a) |
| 127 | |
| 128 | self.assertEqual(a, 20) |
| 129 | |
| 130 | def test_named_expression_assignment_03(self): |
| 131 | (total := 1 + 2) |
| 132 | |
| 133 | self.assertEqual(total, 3) |
| 134 | |
| 135 | def test_named_expression_assignment_04(self): |
| 136 | (info := (1, 2, 3)) |
| 137 | |
| 138 | self.assertEqual(info, (1, 2, 3)) |
| 139 | |
| 140 | def test_named_expression_assignment_05(self): |
| 141 | (x := 1, 2) |
| 142 | |
| 143 | self.assertEqual(x, 1) |
| 144 | |
| 145 | def test_named_expression_assignment_06(self): |
| 146 | (z := (y := (x := 0))) |
| 147 | |
| 148 | self.assertEqual(x, 0) |
| 149 | self.assertEqual(y, 0) |
| 150 | self.assertEqual(z, 0) |
| 151 | |
| 152 | def test_named_expression_assignment_07(self): |
| 153 | (loc := (1, 2)) |
| 154 | |
| 155 | self.assertEqual(loc, (1, 2)) |
| 156 | |
| 157 | def test_named_expression_assignment_08(self): |
| 158 | if spam := "eggs": |
| 159 | self.assertEqual(spam, "eggs") |
| 160 | else: self.fail("variable was not assigned using named expression") |
| 161 | |
| 162 | def test_named_expression_assignment_09(self): |
| 163 | if True and (spam := True): |
| 164 | self.assertTrue(spam) |
| 165 | else: self.fail("variable was not assigned using named expression") |
| 166 | |
| 167 | def test_named_expression_assignment_10(self): |
Joannah Nanjekye | 075de6c | 2019-02-01 22:58:43 +0300 | [diff] [blame] | 168 | if (match := 10) == 10: |
Emily Morehouse | 8f59ee0 | 2019-01-24 16:49:56 -0700 | [diff] [blame] | 169 | pass |
| 170 | else: self.fail("variable was not assigned using named expression") |
| 171 | |
| 172 | def test_named_expression_assignment_11(self): |
| 173 | def spam(a): |
| 174 | return a |
| 175 | input_data = [1, 2, 3] |
| 176 | res = [(x, y, x/y) for x in input_data if (y := spam(x)) > 0] |
| 177 | |
| 178 | self.assertEqual(res, [(1, 1, 1.0), (2, 2, 1.0), (3, 3, 1.0)]) |
| 179 | |
| 180 | def test_named_expression_assignment_12(self): |
| 181 | def spam(a): |
| 182 | return a |
| 183 | res = [[y := spam(x), x/y] for x in range(1, 5)] |
| 184 | |
| 185 | self.assertEqual(res, [[1, 1.0], [2, 1.0], [3, 1.0], [4, 1.0]]) |
| 186 | |
| 187 | def test_named_expression_assignment_13(self): |
| 188 | length = len(lines := [1, 2]) |
| 189 | |
| 190 | self.assertEqual(length, 2) |
| 191 | self.assertEqual(lines, [1,2]) |
| 192 | |
| 193 | def test_named_expression_assignment_14(self): |
| 194 | """ |
| 195 | Where all variables are positive integers, and a is at least as large |
| 196 | as the n'th root of x, this algorithm returns the floor of the n'th |
| 197 | root of x (and roughly doubling the number of accurate bits per |
Emily Morehouse | ac19081 | 2019-02-01 15:27:38 -0700 | [diff] [blame] | 198 | iteration): |
Emily Morehouse | 8f59ee0 | 2019-01-24 16:49:56 -0700 | [diff] [blame] | 199 | """ |
| 200 | a = 9 |
| 201 | n = 2 |
| 202 | x = 3 |
| 203 | |
| 204 | while a > (d := x // a**(n-1)): |
| 205 | a = ((n-1)*a + d) // n |
| 206 | |
| 207 | self.assertEqual(a, 1) |
| 208 | |
Emily Morehouse | ac19081 | 2019-02-01 15:27:38 -0700 | [diff] [blame] | 209 | def test_named_expression_assignment_15(self): |
| 210 | while a := False: |
| 211 | pass # This will not run |
| 212 | |
| 213 | self.assertEqual(a, False) |
| 214 | |
Emily Morehouse | 8f59ee0 | 2019-01-24 16:49:56 -0700 | [diff] [blame] | 215 | |
| 216 | class NamedExpressionScopeTest(unittest.TestCase): |
| 217 | |
| 218 | def test_named_expression_scope_01(self): |
| 219 | code = """def spam(): |
| 220 | (a := 5) |
| 221 | print(a)""" |
| 222 | |
| 223 | with self.assertRaisesRegex(NameError, "name 'a' is not defined"): |
| 224 | exec(code, {}, {}) |
| 225 | |
| 226 | def test_named_expression_scope_02(self): |
| 227 | total = 0 |
| 228 | partial_sums = [total := total + v for v in range(5)] |
| 229 | |
| 230 | self.assertEqual(partial_sums, [0, 1, 3, 6, 10]) |
| 231 | self.assertEqual(total, 10) |
| 232 | |
| 233 | def test_named_expression_scope_03(self): |
| 234 | containsOne = any((lastNum := num) == 1 for num in [1, 2, 3]) |
| 235 | |
| 236 | self.assertTrue(containsOne) |
| 237 | self.assertEqual(lastNum, 1) |
| 238 | |
| 239 | def test_named_expression_scope_04(self): |
| 240 | def spam(a): |
| 241 | return a |
| 242 | res = [[y := spam(x), x/y] for x in range(1, 5)] |
| 243 | |
| 244 | self.assertEqual(y, 4) |
| 245 | |
| 246 | def test_named_expression_scope_05(self): |
| 247 | def spam(a): |
| 248 | return a |
| 249 | input_data = [1, 2, 3] |
| 250 | res = [(x, y, x/y) for x in input_data if (y := spam(x)) > 0] |
| 251 | |
| 252 | self.assertEqual(res, [(1, 1, 1.0), (2, 2, 1.0), (3, 3, 1.0)]) |
| 253 | self.assertEqual(y, 3) |
| 254 | |
| 255 | def test_named_expression_scope_06(self): |
| 256 | res = [[spam := i for i in range(3)] for j in range(2)] |
| 257 | |
| 258 | self.assertEqual(res, [[0, 1, 2], [0, 1, 2]]) |
| 259 | self.assertEqual(spam, 2) |
| 260 | |
| 261 | def test_named_expression_scope_07(self): |
| 262 | len(lines := [1, 2]) |
| 263 | |
| 264 | self.assertEqual(lines, [1, 2]) |
| 265 | |
| 266 | def test_named_expression_scope_08(self): |
| 267 | def spam(a): |
| 268 | return a |
| 269 | |
| 270 | def eggs(b): |
| 271 | return b * 2 |
| 272 | |
| 273 | res = [spam(a := eggs(b := h)) for h in range(2)] |
| 274 | |
| 275 | self.assertEqual(res, [0, 2]) |
| 276 | self.assertEqual(a, 2) |
| 277 | self.assertEqual(b, 1) |
| 278 | |
| 279 | def test_named_expression_scope_09(self): |
| 280 | def spam(a): |
| 281 | return a |
| 282 | |
| 283 | def eggs(b): |
| 284 | return b * 2 |
| 285 | |
| 286 | res = [spam(a := eggs(a := h)) for h in range(2)] |
| 287 | |
| 288 | self.assertEqual(res, [0, 2]) |
| 289 | self.assertEqual(a, 2) |
| 290 | |
| 291 | def test_named_expression_scope_10(self): |
| 292 | res = [b := [a := 1 for i in range(2)] for j in range(2)] |
| 293 | |
| 294 | self.assertEqual(res, [[1, 1], [1, 1]]) |
| 295 | self.assertEqual(a, 1) |
| 296 | self.assertEqual(b, [1, 1]) |
| 297 | |
| 298 | def test_named_expression_scope_11(self): |
| 299 | res = [j := i for i in range(5)] |
| 300 | |
| 301 | self.assertEqual(res, [0, 1, 2, 3, 4]) |
| 302 | self.assertEqual(j, 4) |
| 303 | |
| 304 | def test_named_expression_scope_12(self): |
| 305 | res = [i := i for i in range(5)] |
| 306 | |
| 307 | self.assertEqual(res, [0, 1, 2, 3, 4]) |
| 308 | self.assertEqual(i, 4) |
| 309 | |
| 310 | def test_named_expression_scope_13(self): |
| 311 | res = [i := 0 for i, j in [(1, 2), (3, 4)]] |
| 312 | |
| 313 | self.assertEqual(res, [0, 0]) |
| 314 | self.assertEqual(i, 0) |
| 315 | |
| 316 | def test_named_expression_scope_14(self): |
| 317 | res = [(i := 0, j := 1) for i, j in [(1, 2), (3, 4)]] |
| 318 | |
| 319 | self.assertEqual(res, [(0, 1), (0, 1)]) |
| 320 | self.assertEqual(i, 0) |
| 321 | self.assertEqual(j, 1) |
| 322 | |
| 323 | def test_named_expression_scope_15(self): |
| 324 | res = [(i := i, j := j) for i, j in [(1, 2), (3, 4)]] |
| 325 | |
| 326 | self.assertEqual(res, [(1, 2), (3, 4)]) |
| 327 | self.assertEqual(i, 3) |
| 328 | self.assertEqual(j, 4) |
| 329 | |
| 330 | def test_named_expression_scope_16(self): |
| 331 | res = [(i := j, j := i) for i, j in [(1, 2), (3, 4)]] |
| 332 | |
| 333 | self.assertEqual(res, [(2, 2), (4, 4)]) |
| 334 | self.assertEqual(i, 4) |
| 335 | self.assertEqual(j, 4) |
| 336 | |
| 337 | def test_named_expression_scope_17(self): |
| 338 | b = 0 |
| 339 | res = [b := i + b for i in range(5)] |
| 340 | |
| 341 | self.assertEqual(res, [0, 1, 3, 6, 10]) |
| 342 | self.assertEqual(b, 10) |
| 343 | |
| 344 | def test_named_expression_scope_18(self): |
| 345 | def spam(a): |
| 346 | return a |
| 347 | |
| 348 | res = spam(b := 2) |
| 349 | |
| 350 | self.assertEqual(res, 2) |
| 351 | self.assertEqual(b, 2) |
| 352 | |
| 353 | def test_named_expression_scope_19(self): |
| 354 | def spam(a): |
| 355 | return a |
| 356 | |
| 357 | res = spam((b := 2)) |
| 358 | |
| 359 | self.assertEqual(res, 2) |
| 360 | self.assertEqual(b, 2) |
| 361 | |
| 362 | def test_named_expression_scope_20(self): |
| 363 | def spam(a): |
| 364 | return a |
| 365 | |
| 366 | res = spam(a=(b := 2)) |
| 367 | |
| 368 | self.assertEqual(res, 2) |
| 369 | self.assertEqual(b, 2) |
| 370 | |
| 371 | def test_named_expression_scope_21(self): |
| 372 | def spam(a, b): |
| 373 | return a + b |
| 374 | |
| 375 | res = spam(c := 2, b=1) |
| 376 | |
| 377 | self.assertEqual(res, 3) |
| 378 | self.assertEqual(c, 2) |
| 379 | |
| 380 | def test_named_expression_scope_22(self): |
| 381 | def spam(a, b): |
| 382 | return a + b |
| 383 | |
| 384 | res = spam((c := 2), b=1) |
| 385 | |
| 386 | self.assertEqual(res, 3) |
| 387 | self.assertEqual(c, 2) |
| 388 | |
| 389 | def test_named_expression_scope_23(self): |
| 390 | def spam(a, b): |
| 391 | return a + b |
| 392 | |
| 393 | res = spam(b=(c := 2), a=1) |
| 394 | |
| 395 | self.assertEqual(res, 3) |
| 396 | self.assertEqual(c, 2) |
| 397 | |
| 398 | def test_named_expression_scope_24(self): |
| 399 | a = 10 |
| 400 | def spam(): |
| 401 | nonlocal a |
| 402 | (a := 20) |
| 403 | spam() |
| 404 | |
| 405 | self.assertEqual(a, 20) |
| 406 | |
| 407 | def test_named_expression_scope_25(self): |
| 408 | ns = {} |
| 409 | code = """a = 10 |
| 410 | def spam(): |
| 411 | global a |
| 412 | (a := 20) |
| 413 | spam()""" |
| 414 | |
| 415 | exec(code, ns, {}) |
| 416 | |
| 417 | self.assertEqual(ns["a"], 20) |
| 418 | |
| 419 | |
| 420 | if __name__ == "__main__": |
| 421 | unittest.main() |