python中的异常也是一个类,所有的异常都继承自baseexception。每个异常都由三部分组成:traceback,错误名称,错误原因。 4 python中检测和处理异常的机制是try-except语句 如下: try: try_suite # watch for exceptions here 监控这里的异常 except Exception[, reason]: except_suite # exception-handling code 异常处...
第一种可能情况：list[index], index超出范围,也就是常说的数组越界。第二种可能情况：list是一个空的，没有一个元素，进行list[0]就会出现该错误，在爬虫问题中很常见，比如有个列表爬去下来为空，统一处理就会报错。
* Removes all of the elements of this collection that satisfy the given * predicate. Errors or runtime exceptions thrown during iteration or by * the predicate are relayed to the caller. * * @implSpec * The default implementation traverses all elements of the collection using * its {@link ...
The PythonIndexError: list index out of rangecan be fixed by making sure any elements accessed in a list are within the index range of the list. This can be done by using therange()function along with thelen()function. Therange()function returns a sequence of numbers starting from 0 endi...
Using Python-like syntax The standard library provides ast.literal_eval, which can evaluate certain strings as though they were Python code. This does not create a security risk, but it can still result in crashes and a wide variety of exceptions. For example: on my machine ast.literal_eval...
Python 2.7, Windows dev environment, not using a virtualenv per project, but a global dev environment, installing libraries as needed, happily hopping from one project to the next. I've kept track of most (not sure all) libraries I had to install for a given project. I have not kept ...
appium+python自动化30-list定位(find_elements) 前言 有时候页面上没有id属性,并且其它的属性不唯一,平常用的比较多的是单数(element)的定位方法,遇到元素属性不唯一,就无法直接定位到了。 于是我们可以通过复数(elements)定位,先定位一组元素,再通过下标取出元素,这样也是可以定位到元素的。 一、单数与复数 1....
amqps.exceptions com.microsoft.azure.sdk.iot.device.transport.mqtt.exceptions com.microsoft.azure.sdk.iot.device.fileupload com.microsoft.azure.sdk.iot.device.hsm com.microsoft.azure.sdk.iot.device.transport.https com.microsoft.azure.sdk.iot.device.transport.mqtt com.microsoft.azure.sdk.iot.device....
public List value() Get the value property: List of data flows. Returns: the value value.withNextLink public DataFlowListResponse withNextLink(String nextLink) Set the nextLink property: The link to the next page of results, if any remaining results exist. Parameters: nextLink - the nextLink va...
File "C:\Users\jinqiangli\AppData\Local\Programs\Python\Python38-32\lib\site-packages\urllib3\connection.py", line 171, in _new_conn raise NewConnectionError( urllib3.exceptions.NewConnectionError: <urllib3.connection.HTTPSConnection object at 0x006431D8>: Failed to establish a new connection:...