[英]Customize AssertionError in Python
I'm trying to add some text for all assertion errors in my code. 我正在尝试为我的代码中的所有断言错误添加一些文本。
This is my code: 这是我的代码:
class AssertionError(Exception):
def __init__(self, msg):
Exception.__init__(self, msg)
self.message = msg + "+ SOME TEXT"
assert 1 == 2, "FAIL"
Result is 结果是
__main__.AssertionError: FAIL
I expected to see result: "FAIL + SOME TEXT" 我期待看到结果:“FAIL + SOME TEXT”
Problem is with unittest also. 问题也在于单元测试。 I want add some text for all failed tests (Without updating all text message).
我想为所有失败的测试添加一些文本(不更新所有文本消息)。
import unittest
class TestCase(unittest.TestCase):
def test1(self):
self.assertTrue(False, "FAIL!")
def test2(self):
self.assertLessEqual(10, 2, "FAIL!")
if __name__ == "__main__":
unittest.main()
This is similar to Morgan's answer but uses a slightly different way to accomplish the same result: 这与Morgan的答案类似,但使用稍微不同的方法来实现相同的结果:
>>> class AssertionError(AssertionError):
def __init__(self, msg):
super().__init__(msg + ' SOME TEXT')
>>> assert 1 == 2, 'FAIL'
Traceback (most recent call last):
File "<pyshell#4>", line 1, in <module>
assert 1 == 2, 'FAIL'
AssertionError: FAIL SOME TEXT
The issue is that you're not doing anything with self.message = msg + "+ SOME TEXT"
. 问题是你没有用
self.message = msg + "+ SOME TEXT"
做任何事情。 You have to pass the custom message you want to Exception.__init__
. 您必须将您想要的自定义消息传递给
Exception.__init__
。
This will work for you: 这对你有用:
class AssertionError(Exception):
def __init__(self, msg):
self.message = msg + " SOME TEXT"
super().__init__(self, self.message)
assert 1 == 2, "FAIL"
If you want to view the message in the future, you can use a try/except and catch the custom message like this: 如果您希望以后查看该消息,可以使用try / except并捕获自定义消息,如下所示:
try:
assert 1 == 2, "FAIL"
except AssertionError as e:
print(e.message)
This variant keeps the exception exactly as it was raised and modifies its string representation only: 此变体保留与引发时完全相同的异常,并仅修改其字符串表示形式:
class AssertionError(AssertionError):
def __str__(self):
return super().__str__() + "SOME TEXT"
(credit: subclassing taken from Noctis' answer) (信用:从Noctis的回答中获取的子类)
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