/usr/bin/env python3 # -*- coding: utf-8 -*- ###基类### class BException(Exception):...
do_raise是抛异常的实际操作,里面会检查抛出的异常类型以及参数是否合理,之后再设置当前线程的异常类型 type以及异常值 value RAISE_VARARGS最后会跳到 error以及exception_unwind代码段: error: if (!_PyErr_Occurred(tstate)) { _PyErr_SetString(tstate, PyExc_SystemError, "error return without exception set")...
这里,我们首先定义了一个名为NetworkError的基础异常类,然后我们定义了两个从NetworkError派生的特定网络错误:NetworkTimeoutError和ProtocolError。 与此类似,C++同样可以创建这样的层级结构的自定义异常: class NetworkException : public std::exception{const char* what() const throw (){return "NetworkException ha...
Generator, (function that use yield instead of return) Return sends a specified value back to its caller whereas Yield can produce a sequence of values. We should use yield when we want to iterate over a sequence, but don't want to store the entire sequence in memory. import sys # for ...
11. RecursionError: maximum recursion depth exceeded while calling a Python object 12. ImportError: attempted relative import with no known parent package 13. RuntimeError: The session is unavailable because no secret key was set. Set the secret_key on the application to something unique and secr...
"" return connect( self._creator, self._maxusage, self._setsession, self._failures, self._ping, True, *self._args, **self._kwargs) def connection(self, shareable=True): """Get a steady, cached DB-API 2 connection from the pool. If shareable is set and the underlying DB-API 2 ...
importmodmybar =mod.Bar() You’d get an uglyAttributeErrorexception. Why? Because, as reportedhere, when the interpreter shuts down, the module’s global variables are all set toNone. As a result, in the above example, at the point that__del__is invoked, the namefoohas already been ...
[2023-08-04 11:10:28,806] [ERROR] [MainThread] [consumer.py:248 - perform_pending_operations()] Pending callback raised: SystemError('<built-in method switch of gevent._gevent_cgreenlet.Greenlet object at 0x7fcdb37de700> returned NULL without setting an exception') ...
The code attempts to import the module through its name fetched from the exception, then assigns the return value of dir() to d. Just like with other name suggestions, d is used further down in _compute_suggestion_error() to calculate possible names. Just like for names within the current...
So a becomes local to the scope of another_func, but it has not been initialized previously in the same scope, which throws an error. To modify the outer scope variable a in another_func, we have to use the global keyword. def another_func() global a a += 1 return a Output: >>...