Benjamin Peterson | 9a80fa8 | 2012-01-13 14:39:38 -0500 | [diff] [blame] | 1 | # -*- coding: utf-8 -*- |
| 2 | |
| 3 | """ |
| 4 | Test suite for PEP 380 implementation |
| 5 | |
| 6 | adapted from original tests written by Greg Ewing |
| 7 | see <http://www.cosc.canterbury.ac.nz/greg.ewing/python/yield-from/YieldFrom-Python3.1.2-rev5.zip> |
| 8 | """ |
| 9 | |
| 10 | import unittest |
| 11 | import io |
| 12 | import sys |
Benjamin Peterson | 2afe6ae | 2012-03-15 15:37:39 -0500 | [diff] [blame] | 13 | import inspect |
Benjamin Peterson | 9a80fa8 | 2012-01-13 14:39:38 -0500 | [diff] [blame] | 14 | import parser |
| 15 | |
| 16 | from test.support import captured_stderr |
| 17 | |
| 18 | class TestPEP380Operation(unittest.TestCase): |
| 19 | """ |
| 20 | Test semantics. |
| 21 | """ |
| 22 | |
| 23 | def test_delegation_of_initial_next_to_subgenerator(self): |
| 24 | """ |
| 25 | Test delegation of initial next() call to subgenerator |
| 26 | """ |
| 27 | trace = [] |
| 28 | def g1(): |
| 29 | trace.append("Starting g1") |
| 30 | yield from g2() |
| 31 | trace.append("Finishing g1") |
| 32 | def g2(): |
| 33 | trace.append("Starting g2") |
| 34 | yield 42 |
| 35 | trace.append("Finishing g2") |
| 36 | for x in g1(): |
| 37 | trace.append("Yielded %s" % (x,)) |
| 38 | self.assertEqual(trace,[ |
| 39 | "Starting g1", |
| 40 | "Starting g2", |
| 41 | "Yielded 42", |
| 42 | "Finishing g2", |
| 43 | "Finishing g1", |
| 44 | ]) |
| 45 | |
| 46 | def test_raising_exception_in_initial_next_call(self): |
| 47 | """ |
| 48 | Test raising exception in initial next() call |
| 49 | """ |
| 50 | trace = [] |
| 51 | def g1(): |
| 52 | try: |
| 53 | trace.append("Starting g1") |
| 54 | yield from g2() |
| 55 | finally: |
| 56 | trace.append("Finishing g1") |
| 57 | def g2(): |
| 58 | try: |
| 59 | trace.append("Starting g2") |
| 60 | raise ValueError("spanish inquisition occurred") |
| 61 | finally: |
| 62 | trace.append("Finishing g2") |
| 63 | try: |
| 64 | for x in g1(): |
| 65 | trace.append("Yielded %s" % (x,)) |
| 66 | except ValueError as e: |
| 67 | self.assertEqual(e.args[0], "spanish inquisition occurred") |
| 68 | else: |
| 69 | self.fail("subgenerator failed to raise ValueError") |
| 70 | self.assertEqual(trace,[ |
| 71 | "Starting g1", |
| 72 | "Starting g2", |
| 73 | "Finishing g2", |
| 74 | "Finishing g1", |
| 75 | ]) |
| 76 | |
| 77 | def test_delegation_of_next_call_to_subgenerator(self): |
| 78 | """ |
| 79 | Test delegation of next() call to subgenerator |
| 80 | """ |
| 81 | trace = [] |
| 82 | def g1(): |
| 83 | trace.append("Starting g1") |
| 84 | yield "g1 ham" |
| 85 | yield from g2() |
| 86 | yield "g1 eggs" |
| 87 | trace.append("Finishing g1") |
| 88 | def g2(): |
| 89 | trace.append("Starting g2") |
| 90 | yield "g2 spam" |
| 91 | yield "g2 more spam" |
| 92 | trace.append("Finishing g2") |
| 93 | for x in g1(): |
| 94 | trace.append("Yielded %s" % (x,)) |
| 95 | self.assertEqual(trace,[ |
| 96 | "Starting g1", |
| 97 | "Yielded g1 ham", |
| 98 | "Starting g2", |
| 99 | "Yielded g2 spam", |
| 100 | "Yielded g2 more spam", |
| 101 | "Finishing g2", |
| 102 | "Yielded g1 eggs", |
| 103 | "Finishing g1", |
| 104 | ]) |
| 105 | |
| 106 | def test_raising_exception_in_delegated_next_call(self): |
| 107 | """ |
| 108 | Test raising exception in delegated next() call |
| 109 | """ |
| 110 | trace = [] |
| 111 | def g1(): |
| 112 | try: |
| 113 | trace.append("Starting g1") |
| 114 | yield "g1 ham" |
| 115 | yield from g2() |
| 116 | yield "g1 eggs" |
| 117 | finally: |
| 118 | trace.append("Finishing g1") |
| 119 | def g2(): |
| 120 | try: |
| 121 | trace.append("Starting g2") |
| 122 | yield "g2 spam" |
| 123 | raise ValueError("hovercraft is full of eels") |
| 124 | yield "g2 more spam" |
| 125 | finally: |
| 126 | trace.append("Finishing g2") |
| 127 | try: |
| 128 | for x in g1(): |
| 129 | trace.append("Yielded %s" % (x,)) |
| 130 | except ValueError as e: |
| 131 | self.assertEqual(e.args[0], "hovercraft is full of eels") |
| 132 | else: |
| 133 | self.fail("subgenerator failed to raise ValueError") |
| 134 | self.assertEqual(trace,[ |
| 135 | "Starting g1", |
| 136 | "Yielded g1 ham", |
| 137 | "Starting g2", |
| 138 | "Yielded g2 spam", |
| 139 | "Finishing g2", |
| 140 | "Finishing g1", |
| 141 | ]) |
| 142 | |
| 143 | def test_delegation_of_send(self): |
| 144 | """ |
| 145 | Test delegation of send() |
| 146 | """ |
| 147 | trace = [] |
| 148 | def g1(): |
| 149 | trace.append("Starting g1") |
| 150 | x = yield "g1 ham" |
| 151 | trace.append("g1 received %s" % (x,)) |
| 152 | yield from g2() |
| 153 | x = yield "g1 eggs" |
| 154 | trace.append("g1 received %s" % (x,)) |
| 155 | trace.append("Finishing g1") |
| 156 | def g2(): |
| 157 | trace.append("Starting g2") |
| 158 | x = yield "g2 spam" |
| 159 | trace.append("g2 received %s" % (x,)) |
| 160 | x = yield "g2 more spam" |
| 161 | trace.append("g2 received %s" % (x,)) |
| 162 | trace.append("Finishing g2") |
| 163 | g = g1() |
| 164 | y = next(g) |
| 165 | x = 1 |
| 166 | try: |
| 167 | while 1: |
| 168 | y = g.send(x) |
| 169 | trace.append("Yielded %s" % (y,)) |
| 170 | x += 1 |
| 171 | except StopIteration: |
| 172 | pass |
| 173 | self.assertEqual(trace,[ |
| 174 | "Starting g1", |
| 175 | "g1 received 1", |
| 176 | "Starting g2", |
| 177 | "Yielded g2 spam", |
| 178 | "g2 received 2", |
| 179 | "Yielded g2 more spam", |
| 180 | "g2 received 3", |
| 181 | "Finishing g2", |
| 182 | "Yielded g1 eggs", |
| 183 | "g1 received 4", |
| 184 | "Finishing g1", |
| 185 | ]) |
| 186 | |
| 187 | def test_handling_exception_while_delegating_send(self): |
| 188 | """ |
| 189 | Test handling exception while delegating 'send' |
| 190 | """ |
| 191 | trace = [] |
| 192 | def g1(): |
| 193 | trace.append("Starting g1") |
| 194 | x = yield "g1 ham" |
| 195 | trace.append("g1 received %s" % (x,)) |
| 196 | yield from g2() |
| 197 | x = yield "g1 eggs" |
| 198 | trace.append("g1 received %s" % (x,)) |
| 199 | trace.append("Finishing g1") |
| 200 | def g2(): |
| 201 | trace.append("Starting g2") |
| 202 | x = yield "g2 spam" |
| 203 | trace.append("g2 received %s" % (x,)) |
| 204 | raise ValueError("hovercraft is full of eels") |
| 205 | x = yield "g2 more spam" |
| 206 | trace.append("g2 received %s" % (x,)) |
| 207 | trace.append("Finishing g2") |
| 208 | def run(): |
| 209 | g = g1() |
| 210 | y = next(g) |
| 211 | x = 1 |
| 212 | try: |
| 213 | while 1: |
| 214 | y = g.send(x) |
| 215 | trace.append("Yielded %s" % (y,)) |
| 216 | x += 1 |
| 217 | except StopIteration: |
| 218 | trace.append("StopIteration") |
| 219 | self.assertRaises(ValueError,run) |
| 220 | self.assertEqual(trace,[ |
| 221 | "Starting g1", |
| 222 | "g1 received 1", |
| 223 | "Starting g2", |
| 224 | "Yielded g2 spam", |
| 225 | "g2 received 2", |
| 226 | ]) |
| 227 | |
| 228 | def test_delegating_close(self): |
| 229 | """ |
| 230 | Test delegating 'close' |
| 231 | """ |
| 232 | trace = [] |
| 233 | def g1(): |
| 234 | try: |
| 235 | trace.append("Starting g1") |
| 236 | yield "g1 ham" |
| 237 | yield from g2() |
| 238 | yield "g1 eggs" |
| 239 | finally: |
| 240 | trace.append("Finishing g1") |
| 241 | def g2(): |
| 242 | try: |
| 243 | trace.append("Starting g2") |
| 244 | yield "g2 spam" |
| 245 | yield "g2 more spam" |
| 246 | finally: |
| 247 | trace.append("Finishing g2") |
| 248 | g = g1() |
| 249 | for i in range(2): |
| 250 | x = next(g) |
| 251 | trace.append("Yielded %s" % (x,)) |
| 252 | g.close() |
| 253 | self.assertEqual(trace,[ |
| 254 | "Starting g1", |
| 255 | "Yielded g1 ham", |
| 256 | "Starting g2", |
| 257 | "Yielded g2 spam", |
| 258 | "Finishing g2", |
| 259 | "Finishing g1" |
| 260 | ]) |
| 261 | |
| 262 | def test_handing_exception_while_delegating_close(self): |
| 263 | """ |
| 264 | Test handling exception while delegating 'close' |
| 265 | """ |
| 266 | trace = [] |
| 267 | def g1(): |
| 268 | try: |
| 269 | trace.append("Starting g1") |
| 270 | yield "g1 ham" |
| 271 | yield from g2() |
| 272 | yield "g1 eggs" |
| 273 | finally: |
| 274 | trace.append("Finishing g1") |
| 275 | def g2(): |
| 276 | try: |
| 277 | trace.append("Starting g2") |
| 278 | yield "g2 spam" |
| 279 | yield "g2 more spam" |
| 280 | finally: |
| 281 | trace.append("Finishing g2") |
| 282 | raise ValueError("nybbles have exploded with delight") |
| 283 | try: |
| 284 | g = g1() |
| 285 | for i in range(2): |
| 286 | x = next(g) |
| 287 | trace.append("Yielded %s" % (x,)) |
| 288 | g.close() |
| 289 | except ValueError as e: |
| 290 | self.assertEqual(e.args[0], "nybbles have exploded with delight") |
| 291 | self.assertIsInstance(e.__context__, GeneratorExit) |
| 292 | else: |
| 293 | self.fail("subgenerator failed to raise ValueError") |
| 294 | self.assertEqual(trace,[ |
| 295 | "Starting g1", |
| 296 | "Yielded g1 ham", |
| 297 | "Starting g2", |
| 298 | "Yielded g2 spam", |
| 299 | "Finishing g2", |
| 300 | "Finishing g1", |
| 301 | ]) |
| 302 | |
| 303 | def test_delegating_throw(self): |
| 304 | """ |
| 305 | Test delegating 'throw' |
| 306 | """ |
| 307 | trace = [] |
| 308 | def g1(): |
| 309 | try: |
| 310 | trace.append("Starting g1") |
| 311 | yield "g1 ham" |
| 312 | yield from g2() |
| 313 | yield "g1 eggs" |
| 314 | finally: |
| 315 | trace.append("Finishing g1") |
| 316 | def g2(): |
| 317 | try: |
| 318 | trace.append("Starting g2") |
| 319 | yield "g2 spam" |
| 320 | yield "g2 more spam" |
| 321 | finally: |
| 322 | trace.append("Finishing g2") |
| 323 | try: |
| 324 | g = g1() |
| 325 | for i in range(2): |
| 326 | x = next(g) |
| 327 | trace.append("Yielded %s" % (x,)) |
| 328 | e = ValueError("tomato ejected") |
| 329 | g.throw(e) |
| 330 | except ValueError as e: |
| 331 | self.assertEqual(e.args[0], "tomato ejected") |
| 332 | else: |
| 333 | self.fail("subgenerator failed to raise ValueError") |
| 334 | self.assertEqual(trace,[ |
| 335 | "Starting g1", |
| 336 | "Yielded g1 ham", |
| 337 | "Starting g2", |
| 338 | "Yielded g2 spam", |
| 339 | "Finishing g2", |
| 340 | "Finishing g1", |
| 341 | ]) |
| 342 | |
| 343 | def test_value_attribute_of_StopIteration_exception(self): |
| 344 | """ |
| 345 | Test 'value' attribute of StopIteration exception |
| 346 | """ |
| 347 | trace = [] |
| 348 | def pex(e): |
| 349 | trace.append("%s: %s" % (e.__class__.__name__, e)) |
| 350 | trace.append("value = %s" % (e.value,)) |
| 351 | e = StopIteration() |
| 352 | pex(e) |
| 353 | e = StopIteration("spam") |
| 354 | pex(e) |
| 355 | e.value = "eggs" |
| 356 | pex(e) |
| 357 | self.assertEqual(trace,[ |
| 358 | "StopIteration: ", |
| 359 | "value = None", |
| 360 | "StopIteration: spam", |
| 361 | "value = spam", |
| 362 | "StopIteration: spam", |
| 363 | "value = eggs", |
| 364 | ]) |
| 365 | |
| 366 | |
Amaury Forgeot d'Arc | e557da8 | 2012-01-13 21:06:12 +0100 | [diff] [blame] | 367 | def test_exception_value_crash(self): |
| 368 | # There used to be a refcount error when the return value |
| 369 | # stored in the StopIteration has a refcount of 1. |
| 370 | def g1(): |
| 371 | yield from g2() |
| 372 | def g2(): |
| 373 | yield "g2" |
| 374 | return [42] |
| 375 | self.assertEqual(list(g1()), ["g2"]) |
| 376 | |
| 377 | |
Benjamin Peterson | 9a80fa8 | 2012-01-13 14:39:38 -0500 | [diff] [blame] | 378 | def test_generator_return_value(self): |
| 379 | """ |
| 380 | Test generator return value |
| 381 | """ |
| 382 | trace = [] |
| 383 | def g1(): |
| 384 | trace.append("Starting g1") |
| 385 | yield "g1 ham" |
| 386 | ret = yield from g2() |
| 387 | trace.append("g2 returned %s" % (ret,)) |
| 388 | ret = yield from g2(42) |
| 389 | trace.append("g2 returned %s" % (ret,)) |
| 390 | yield "g1 eggs" |
| 391 | trace.append("Finishing g1") |
| 392 | def g2(v = None): |
| 393 | trace.append("Starting g2") |
| 394 | yield "g2 spam" |
| 395 | yield "g2 more spam" |
| 396 | trace.append("Finishing g2") |
| 397 | if v: |
| 398 | return v |
| 399 | for x in g1(): |
| 400 | trace.append("Yielded %s" % (x,)) |
| 401 | self.assertEqual(trace,[ |
| 402 | "Starting g1", |
| 403 | "Yielded g1 ham", |
| 404 | "Starting g2", |
| 405 | "Yielded g2 spam", |
| 406 | "Yielded g2 more spam", |
| 407 | "Finishing g2", |
| 408 | "g2 returned None", |
| 409 | "Starting g2", |
| 410 | "Yielded g2 spam", |
| 411 | "Yielded g2 more spam", |
| 412 | "Finishing g2", |
| 413 | "g2 returned 42", |
| 414 | "Yielded g1 eggs", |
| 415 | "Finishing g1", |
| 416 | ]) |
| 417 | |
| 418 | def test_delegation_of_next_to_non_generator(self): |
| 419 | """ |
| 420 | Test delegation of next() to non-generator |
| 421 | """ |
| 422 | trace = [] |
| 423 | def g(): |
| 424 | yield from range(3) |
| 425 | for x in g(): |
| 426 | trace.append("Yielded %s" % (x,)) |
| 427 | self.assertEqual(trace,[ |
| 428 | "Yielded 0", |
| 429 | "Yielded 1", |
| 430 | "Yielded 2", |
| 431 | ]) |
| 432 | |
| 433 | |
| 434 | def test_conversion_of_sendNone_to_next(self): |
| 435 | """ |
| 436 | Test conversion of send(None) to next() |
| 437 | """ |
| 438 | trace = [] |
| 439 | def g(): |
| 440 | yield from range(3) |
| 441 | gi = g() |
| 442 | for x in range(3): |
| 443 | y = gi.send(None) |
| 444 | trace.append("Yielded: %s" % (y,)) |
| 445 | self.assertEqual(trace,[ |
| 446 | "Yielded: 0", |
| 447 | "Yielded: 1", |
| 448 | "Yielded: 2", |
| 449 | ]) |
| 450 | |
| 451 | def test_delegation_of_close_to_non_generator(self): |
| 452 | """ |
| 453 | Test delegation of close() to non-generator |
| 454 | """ |
| 455 | trace = [] |
| 456 | def g(): |
| 457 | try: |
| 458 | trace.append("starting g") |
| 459 | yield from range(3) |
| 460 | trace.append("g should not be here") |
| 461 | finally: |
| 462 | trace.append("finishing g") |
| 463 | gi = g() |
| 464 | next(gi) |
| 465 | with captured_stderr() as output: |
| 466 | gi.close() |
| 467 | self.assertEqual(output.getvalue(), '') |
| 468 | self.assertEqual(trace,[ |
| 469 | "starting g", |
| 470 | "finishing g", |
| 471 | ]) |
| 472 | |
| 473 | def test_delegating_throw_to_non_generator(self): |
| 474 | """ |
| 475 | Test delegating 'throw' to non-generator |
| 476 | """ |
| 477 | trace = [] |
| 478 | def g(): |
| 479 | try: |
| 480 | trace.append("Starting g") |
| 481 | yield from range(10) |
| 482 | finally: |
| 483 | trace.append("Finishing g") |
| 484 | try: |
| 485 | gi = g() |
| 486 | for i in range(5): |
| 487 | x = next(gi) |
| 488 | trace.append("Yielded %s" % (x,)) |
| 489 | e = ValueError("tomato ejected") |
| 490 | gi.throw(e) |
| 491 | except ValueError as e: |
| 492 | self.assertEqual(e.args[0],"tomato ejected") |
| 493 | else: |
| 494 | self.fail("subgenerator failed to raise ValueError") |
| 495 | self.assertEqual(trace,[ |
| 496 | "Starting g", |
| 497 | "Yielded 0", |
| 498 | "Yielded 1", |
| 499 | "Yielded 2", |
| 500 | "Yielded 3", |
| 501 | "Yielded 4", |
| 502 | "Finishing g", |
| 503 | ]) |
| 504 | |
| 505 | def test_attempting_to_send_to_non_generator(self): |
| 506 | """ |
| 507 | Test attempting to send to non-generator |
| 508 | """ |
| 509 | trace = [] |
| 510 | def g(): |
| 511 | try: |
| 512 | trace.append("starting g") |
| 513 | yield from range(3) |
| 514 | trace.append("g should not be here") |
| 515 | finally: |
| 516 | trace.append("finishing g") |
| 517 | try: |
| 518 | gi = g() |
| 519 | next(gi) |
| 520 | for x in range(3): |
| 521 | y = gi.send(42) |
| 522 | trace.append("Should not have yielded:", y) |
| 523 | except AttributeError as e: |
| 524 | self.assertIn("send", e.args[0]) |
| 525 | else: |
| 526 | self.fail("was able to send into non-generator") |
| 527 | self.assertEqual(trace,[ |
| 528 | "starting g", |
| 529 | "finishing g", |
| 530 | ]) |
| 531 | |
| 532 | def test_broken_getattr_handling(self): |
| 533 | """ |
| 534 | Test subiterator with a broken getattr implementation |
| 535 | """ |
| 536 | class Broken: |
| 537 | def __iter__(self): |
| 538 | return self |
| 539 | def __next__(self): |
| 540 | return 1 |
| 541 | def __getattr__(self, attr): |
| 542 | 1/0 |
| 543 | |
| 544 | def g(): |
| 545 | yield from Broken() |
| 546 | |
| 547 | with self.assertRaises(ZeroDivisionError): |
| 548 | gi = g() |
| 549 | self.assertEqual(next(gi), 1) |
| 550 | gi.send(1) |
| 551 | |
| 552 | with self.assertRaises(ZeroDivisionError): |
| 553 | gi = g() |
| 554 | self.assertEqual(next(gi), 1) |
| 555 | gi.throw(AttributeError) |
| 556 | |
| 557 | with captured_stderr() as output: |
| 558 | gi = g() |
| 559 | self.assertEqual(next(gi), 1) |
| 560 | gi.close() |
| 561 | self.assertIn('ZeroDivisionError', output.getvalue()) |
| 562 | |
| 563 | def test_exception_in_initial_next_call(self): |
| 564 | """ |
| 565 | Test exception in initial next() call |
| 566 | """ |
| 567 | trace = [] |
| 568 | def g1(): |
| 569 | trace.append("g1 about to yield from g2") |
| 570 | yield from g2() |
| 571 | trace.append("g1 should not be here") |
| 572 | def g2(): |
| 573 | yield 1/0 |
| 574 | def run(): |
| 575 | gi = g1() |
| 576 | next(gi) |
| 577 | self.assertRaises(ZeroDivisionError,run) |
| 578 | self.assertEqual(trace,[ |
| 579 | "g1 about to yield from g2" |
| 580 | ]) |
| 581 | |
| 582 | def test_attempted_yield_from_loop(self): |
| 583 | """ |
| 584 | Test attempted yield-from loop |
| 585 | """ |
| 586 | trace = [] |
| 587 | def g1(): |
| 588 | trace.append("g1: starting") |
| 589 | yield "y1" |
| 590 | trace.append("g1: about to yield from g2") |
| 591 | yield from g2() |
| 592 | trace.append("g1 should not be here") |
| 593 | |
| 594 | def g2(): |
| 595 | trace.append("g2: starting") |
| 596 | yield "y2" |
| 597 | trace.append("g2: about to yield from g1") |
| 598 | yield from gi |
| 599 | trace.append("g2 should not be here") |
| 600 | try: |
| 601 | gi = g1() |
| 602 | for y in gi: |
| 603 | trace.append("Yielded: %s" % (y,)) |
| 604 | except ValueError as e: |
| 605 | self.assertEqual(e.args[0],"generator already executing") |
| 606 | else: |
| 607 | self.fail("subgenerator didn't raise ValueError") |
| 608 | self.assertEqual(trace,[ |
| 609 | "g1: starting", |
| 610 | "Yielded: y1", |
| 611 | "g1: about to yield from g2", |
| 612 | "g2: starting", |
| 613 | "Yielded: y2", |
| 614 | "g2: about to yield from g1", |
| 615 | ]) |
| 616 | |
| 617 | def test_returning_value_from_delegated_throw(self): |
| 618 | """ |
| 619 | Test returning value from delegated 'throw' |
| 620 | """ |
| 621 | trace = [] |
| 622 | def g1(): |
| 623 | try: |
| 624 | trace.append("Starting g1") |
| 625 | yield "g1 ham" |
| 626 | yield from g2() |
| 627 | yield "g1 eggs" |
| 628 | finally: |
| 629 | trace.append("Finishing g1") |
| 630 | def g2(): |
| 631 | try: |
| 632 | trace.append("Starting g2") |
| 633 | yield "g2 spam" |
| 634 | yield "g2 more spam" |
| 635 | except LunchError: |
| 636 | trace.append("Caught LunchError in g2") |
| 637 | yield "g2 lunch saved" |
| 638 | yield "g2 yet more spam" |
| 639 | class LunchError(Exception): |
| 640 | pass |
| 641 | g = g1() |
| 642 | for i in range(2): |
| 643 | x = next(g) |
| 644 | trace.append("Yielded %s" % (x,)) |
| 645 | e = LunchError("tomato ejected") |
| 646 | g.throw(e) |
| 647 | for x in g: |
| 648 | trace.append("Yielded %s" % (x,)) |
| 649 | self.assertEqual(trace,[ |
| 650 | "Starting g1", |
| 651 | "Yielded g1 ham", |
| 652 | "Starting g2", |
| 653 | "Yielded g2 spam", |
| 654 | "Caught LunchError in g2", |
| 655 | "Yielded g2 yet more spam", |
| 656 | "Yielded g1 eggs", |
| 657 | "Finishing g1", |
| 658 | ]) |
| 659 | |
| 660 | def test_next_and_return_with_value(self): |
| 661 | """ |
| 662 | Test next and return with value |
| 663 | """ |
| 664 | trace = [] |
| 665 | def f(r): |
| 666 | gi = g(r) |
| 667 | next(gi) |
| 668 | try: |
| 669 | trace.append("f resuming g") |
| 670 | next(gi) |
| 671 | trace.append("f SHOULD NOT BE HERE") |
| 672 | except StopIteration as e: |
| 673 | trace.append("f caught %s" % (repr(e),)) |
| 674 | def g(r): |
| 675 | trace.append("g starting") |
| 676 | yield |
| 677 | trace.append("g returning %s" % (r,)) |
| 678 | return r |
| 679 | f(None) |
| 680 | f(42) |
| 681 | self.assertEqual(trace,[ |
| 682 | "g starting", |
| 683 | "f resuming g", |
| 684 | "g returning None", |
| 685 | "f caught StopIteration()", |
| 686 | "g starting", |
| 687 | "f resuming g", |
| 688 | "g returning 42", |
| 689 | "f caught StopIteration(42,)", |
| 690 | ]) |
| 691 | |
| 692 | def test_send_and_return_with_value(self): |
| 693 | """ |
| 694 | Test send and return with value |
| 695 | """ |
| 696 | trace = [] |
| 697 | def f(r): |
| 698 | gi = g(r) |
| 699 | next(gi) |
| 700 | try: |
| 701 | trace.append("f sending spam to g") |
| 702 | gi.send("spam") |
| 703 | trace.append("f SHOULD NOT BE HERE") |
| 704 | except StopIteration as e: |
| 705 | trace.append("f caught %r" % (e,)) |
| 706 | def g(r): |
| 707 | trace.append("g starting") |
| 708 | x = yield |
| 709 | trace.append("g received %s" % (x,)) |
| 710 | trace.append("g returning %s" % (r,)) |
| 711 | return r |
| 712 | f(None) |
| 713 | f(42) |
| 714 | self.assertEqual(trace,[ |
| 715 | "g starting", |
| 716 | "f sending spam to g", |
| 717 | "g received spam", |
| 718 | "g returning None", |
| 719 | "f caught StopIteration()", |
| 720 | "g starting", |
| 721 | "f sending spam to g", |
| 722 | "g received spam", |
| 723 | "g returning 42", |
| 724 | "f caught StopIteration(42,)", |
| 725 | ]) |
| 726 | |
| 727 | def test_catching_exception_from_subgen_and_returning(self): |
| 728 | """ |
| 729 | Test catching an exception thrown into a |
| 730 | subgenerator and returning a value |
| 731 | """ |
| 732 | trace = [] |
| 733 | def inner(): |
| 734 | try: |
| 735 | yield 1 |
| 736 | except ValueError: |
| 737 | trace.append("inner caught ValueError") |
| 738 | return 2 |
| 739 | |
| 740 | def outer(): |
| 741 | v = yield from inner() |
| 742 | trace.append("inner returned %r to outer" % v) |
| 743 | yield v |
| 744 | g = outer() |
| 745 | trace.append(next(g)) |
| 746 | trace.append(g.throw(ValueError)) |
| 747 | self.assertEqual(trace,[ |
| 748 | 1, |
| 749 | "inner caught ValueError", |
| 750 | "inner returned 2 to outer", |
| 751 | 2, |
| 752 | ]) |
| 753 | |
| 754 | def test_throwing_GeneratorExit_into_subgen_that_returns(self): |
| 755 | """ |
| 756 | Test throwing GeneratorExit into a subgenerator that |
| 757 | catches it and returns normally. |
| 758 | """ |
| 759 | trace = [] |
| 760 | def f(): |
| 761 | try: |
| 762 | trace.append("Enter f") |
| 763 | yield |
| 764 | trace.append("Exit f") |
| 765 | except GeneratorExit: |
| 766 | return |
| 767 | def g(): |
| 768 | trace.append("Enter g") |
| 769 | yield from f() |
| 770 | trace.append("Exit g") |
| 771 | try: |
| 772 | gi = g() |
| 773 | next(gi) |
| 774 | gi.throw(GeneratorExit) |
| 775 | except GeneratorExit: |
| 776 | pass |
| 777 | else: |
| 778 | self.fail("subgenerator failed to raise GeneratorExit") |
| 779 | self.assertEqual(trace,[ |
| 780 | "Enter g", |
| 781 | "Enter f", |
| 782 | ]) |
| 783 | |
| 784 | def test_throwing_GeneratorExit_into_subgenerator_that_yields(self): |
| 785 | """ |
| 786 | Test throwing GeneratorExit into a subgenerator that |
| 787 | catches it and yields. |
| 788 | """ |
| 789 | trace = [] |
| 790 | def f(): |
| 791 | try: |
| 792 | trace.append("Enter f") |
| 793 | yield |
| 794 | trace.append("Exit f") |
| 795 | except GeneratorExit: |
| 796 | yield |
| 797 | def g(): |
| 798 | trace.append("Enter g") |
| 799 | yield from f() |
| 800 | trace.append("Exit g") |
| 801 | try: |
| 802 | gi = g() |
| 803 | next(gi) |
| 804 | gi.throw(GeneratorExit) |
| 805 | except RuntimeError as e: |
| 806 | self.assertEqual(e.args[0], "generator ignored GeneratorExit") |
| 807 | else: |
| 808 | self.fail("subgenerator failed to raise GeneratorExit") |
| 809 | self.assertEqual(trace,[ |
| 810 | "Enter g", |
| 811 | "Enter f", |
| 812 | ]) |
| 813 | |
| 814 | def test_throwing_GeneratorExit_into_subgen_that_raises(self): |
| 815 | """ |
| 816 | Test throwing GeneratorExit into a subgenerator that |
| 817 | catches it and raises a different exception. |
| 818 | """ |
| 819 | trace = [] |
| 820 | def f(): |
| 821 | try: |
| 822 | trace.append("Enter f") |
| 823 | yield |
| 824 | trace.append("Exit f") |
| 825 | except GeneratorExit: |
| 826 | raise ValueError("Vorpal bunny encountered") |
| 827 | def g(): |
| 828 | trace.append("Enter g") |
| 829 | yield from f() |
| 830 | trace.append("Exit g") |
| 831 | try: |
| 832 | gi = g() |
| 833 | next(gi) |
| 834 | gi.throw(GeneratorExit) |
| 835 | except ValueError as e: |
| 836 | self.assertEqual(e.args[0], "Vorpal bunny encountered") |
| 837 | self.assertIsInstance(e.__context__, GeneratorExit) |
| 838 | else: |
| 839 | self.fail("subgenerator failed to raise ValueError") |
| 840 | self.assertEqual(trace,[ |
| 841 | "Enter g", |
| 842 | "Enter f", |
| 843 | ]) |
| 844 | |
Benjamin Peterson | 0296a56 | 2012-01-13 14:54:31 -0500 | [diff] [blame] | 845 | def test_yield_from_empty(self): |
| 846 | def g(): |
| 847 | yield from () |
| 848 | self.assertRaises(StopIteration, next, g()) |
| 849 | |
Benjamin Peterson | 099a78f | 2012-03-07 17:57:04 -0600 | [diff] [blame] | 850 | def test_delegating_generators_claim_to_be_running(self): |
| 851 | # Check with basic iteration |
| 852 | def one(): |
| 853 | yield 0 |
| 854 | yield from two() |
| 855 | yield 3 |
| 856 | def two(): |
| 857 | yield 1 |
| 858 | try: |
| 859 | yield from g1 |
| 860 | except ValueError: |
| 861 | pass |
| 862 | yield 2 |
| 863 | g1 = one() |
| 864 | self.assertEqual(list(g1), [0, 1, 2, 3]) |
| 865 | # Check with send |
| 866 | g1 = one() |
| 867 | res = [next(g1)] |
| 868 | try: |
| 869 | while True: |
| 870 | res.append(g1.send(42)) |
| 871 | except StopIteration: |
| 872 | pass |
| 873 | self.assertEqual(res, [0, 1, 2, 3]) |
| 874 | # Check with throw |
| 875 | class MyErr(Exception): |
| 876 | pass |
| 877 | def one(): |
| 878 | try: |
| 879 | yield 0 |
| 880 | except MyErr: |
| 881 | pass |
| 882 | yield from two() |
| 883 | try: |
| 884 | yield 3 |
| 885 | except MyErr: |
| 886 | pass |
| 887 | def two(): |
| 888 | try: |
| 889 | yield 1 |
| 890 | except MyErr: |
| 891 | pass |
| 892 | try: |
| 893 | yield from g1 |
| 894 | except ValueError: |
| 895 | pass |
| 896 | try: |
| 897 | yield 2 |
| 898 | except MyErr: |
| 899 | pass |
| 900 | g1 = one() |
| 901 | res = [next(g1)] |
| 902 | try: |
| 903 | while True: |
| 904 | res.append(g1.throw(MyErr)) |
| 905 | except StopIteration: |
| 906 | pass |
| 907 | # Check with close |
| 908 | class MyIt(object): |
| 909 | def __iter__(self): |
| 910 | return self |
| 911 | def __next__(self): |
| 912 | return 42 |
| 913 | def close(self_): |
| 914 | self.assertTrue(g1.gi_running) |
| 915 | self.assertRaises(ValueError, next, g1) |
| 916 | def one(): |
| 917 | yield from MyIt() |
| 918 | g1 = one() |
| 919 | next(g1) |
| 920 | g1.close() |
| 921 | |
Benjamin Peterson | 2afe6ae | 2012-03-15 15:37:39 -0500 | [diff] [blame] | 922 | def test_delegator_is_visible_to_debugger(self): |
| 923 | def call_stack(): |
| 924 | return [f[3] for f in inspect.stack()] |
| 925 | |
| 926 | def gen(): |
| 927 | yield call_stack() |
| 928 | yield call_stack() |
| 929 | yield call_stack() |
| 930 | |
| 931 | def spam(g): |
| 932 | yield from g |
| 933 | |
| 934 | def eggs(g): |
| 935 | yield from g |
| 936 | |
| 937 | for stack in spam(gen()): |
| 938 | self.assertTrue('spam' in stack) |
| 939 | |
| 940 | for stack in spam(eggs(gen())): |
| 941 | self.assertTrue('spam' in stack and 'eggs' in stack) |
| 942 | |
Benjamin Peterson | b37df51 | 2012-08-06 17:53:09 -0700 | [diff] [blame] | 943 | def test_custom_iterator_return(self): |
| 944 | # See issue #15568 |
| 945 | class MyIter: |
| 946 | def __iter__(self): |
| 947 | return self |
| 948 | def __next__(self): |
| 949 | raise StopIteration(42) |
| 950 | def gen(): |
| 951 | nonlocal ret |
| 952 | ret = yield from MyIter() |
| 953 | ret = None |
| 954 | list(gen()) |
| 955 | self.assertEqual(ret, 42) |
| 956 | |
Benjamin Peterson | 9a80fa8 | 2012-01-13 14:39:38 -0500 | [diff] [blame] | 957 | |
| 958 | def test_main(): |
| 959 | from test import support |
| 960 | test_classes = [TestPEP380Operation] |
| 961 | support.run_unittest(*test_classes) |
| 962 | |
| 963 | |
| 964 | if __name__ == '__main__': |
| 965 | test_main() |