self[key] = value 为了编写单元测试,我们需要引入Python自带的unittest模块,编写mydict_test.py如下: importunittestfrommydictimportDictclassTestDict(unittest.TestCase):deftest_init(self): d =Dict(a=1, b='test') self.assertEqual(d.a,1) self.assertEqual(d.b,'test') self.assertTrue(isinstance(...
"""Base class for exceptions in this module.""" pass class InputError(Error): """Exception raised for errors in the input. Attributes: expression -- input expression in which the error occurred message -- explanation of the error """ def __init__(self, expression, message): self.expres...
File "test.py", line 3, in <module> raise Exception('x 不能大于 5。x 的值为: {}'.format(x)) Exception: x不能大于10。x的值为: 20 raise 唯一的一个参数指定了要被抛出的异常。它必须是一个异常的实例或者是异常的类(也就是 Exception 的子类)。 如果你只想知道这是否抛出了一个异常,并不...
defraiseexc(self,param):ifparam<5:raiseException('test exception')if__name__=='__main__':test=Test()withtest.contextmanager()asteststr:print(teststr)print('end of main') 打印出了: now in __enter__ exception happened now exit Traceback (most recent call last): File "C:\Program Fi...
class Error(Exception): """Base class for exceptions in this module.""" pass class InputError(Error): """Exception raised for errors in the input. Attributes: expression -- input expression in which the error occurred message -- explanation of the error ...
class Error(Exception): """Base class for exceptions in this module.""" pass class InputError(Error): """Exception raised for errors in the input. Attributes: expression -- input expression in which the error occurred message -- explanation of the error ...
raise[Exception[,args[,traceback]]] 以下实例如果 x 大于 5 就触发异常: x=10 ifx>5: raiseException('x 不能大于 5。x 的值为: {}'.format(x)) 执行以上代码会触发异常: Traceback(most recent calllast):File"test.py",line3,in<module>raiseException('x 不能大于 5。x 的值为: {}'.forma...
except (name2, name3): # Run if any of these exceptions occur statements except name4 as var: # Run if name4 is raised, assign instance raised to var statements except: # Run for all other exceptions raised statementsring try block else: statements # Run if no exception was raised du...
Every raised exception has a traceback, also known as a stack trace, stack traceback, or backtrace, among other names. A traceback is a report containing the sequence of calls and operations that traces down to the current exception.
如果你听说过“测试驱动开发”(TDD:Test-Driven Development),单元测试就不陌生。 单元测试是用来对一个模块、一个函数或者一个类来进行正确性检验的测试工作。 比如对函数abs(),我们可以编写出以下几个测试用例: 输入正数,比如1、1.2、0.99,期待返回...