我使用的是python 2.7，龍卷風4.5以下代碼不起作用： except 塊不會被觸發。我不明白為什么？@gen.coroutinedef co_do_thing(): yield gen.Task(do_thing)def do_thing(callback): try: a, b = ... result = maybe_throw(a, b, callback) except Exception as e: # this block is not called if a: raise ApiError("called with A") elif b: raise ApiError("called with B") else: raise edef maybe_throw(arg1, arg2, callback): if random.random() < 0.5: raise AssertionError("yikes") callback("done")co_do_thing相反，我可以在調用周圍捕獲異常gen.Task；但后來我不知道我如何調用的上下文maybe_throw。maybe_throw就我而言，引發較低級別的異常并讓調用者根據輸入將其轉換為人類可讀的錯誤更有意義。我是否只需要重構它以在較低級別調用 gen.Task ？那會很煩人：/
1 回答
暮色呼如
TA貢獻1853條經驗 獲得超9個贊
當我測試它似乎有效時，會引發異常。下面是簡單的測試套件：
import q # q.py is the file with question's code
import unittest
from mock import patch, Mock
from tornado.testing import gen_test, AsyncTestCase
class MyTest(AsyncTestCase):
def setUp(self):
self.mock_random = patch('q.random').start()
AsyncTestCase.setUp(self)
def tearDown(self):
AsyncTestCase.tearDown(self)
patch.stopall()
@gen_test
def test_no_error(self):
self.mock_random.return_value = 0.7
res = yield q.co_do_thing()
self.assertEqual(res, 'done')
@gen_test
def test_exception(self):
self.mock_random.return_value = 0.1
with self.assertRaises(Exception) as ctx:
yield q.co_do_thing()
self.assertEqual(ctx.exception.message, 'called with A')
if __name__ == '__main__':
unittest.main()
測試通過了：
..
----------------------------------------------------------------------
Ran 2 tests in 0.002s
OK
這是q.py，我添加了 return 語句來測試它。
from random import random
from tornado import gen
@gen.coroutine
def co_do_thing():
res = yield gen.Task(do_thing)
# added: to enable to test it meaningfully
raise gen.Return(res)
def do_thing(callback):
try:
a, b = 22, 33
result = maybe_throw(a, b, callback)
except Exception as e:
if a:
raise Exception("called with A")
elif b:
raise Exception("called with B")
else:
raise e
def maybe_throw(arg1, arg2, callback):
if random() < 0.5:
raise AssertionError("yikes")
callback("done")
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