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This article mainly introduces "abnormal knowledge points in Python". In daily operation, I believe that many people have doubts about abnormal knowledge points in Python. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about "abnormal knowledge points in Python". Next, please follow the editor to study!

Preface

You have executed some code in the previous chapters, and you must have encountered a situation where the program "crashed" or terminated due to an unresolved error. You will see the "tracking record (traceback)" message and the subsequent information provided to you by the interpreter, including the name of the error, the reason, and the line number where the error occurred. Whether you execute through a Python interpreter or a standard script, all errors follow a similar format, which provides a consistent error interface. All errors, whether semantic or logical, are caused by incompatibility with the Python interpreter, with the result that an exception is thrown.

Let's look at some examples of anomalies.

NameError

Try to access an undeclared variable

NameError indicates that we accessed a variable that was not initialized.

The called variable was not found in the symbol table of the Python interpreter. Any accessible variable must be defined before it can be used, the access variable needs to be searched by the interpreter, and if the requested name is not found in any namespace, a NameError exception will be generated.

ZeroDivisionError

Divisor is zero

SyntaxError represents an incorrect structure in the Python code that the program cannot execute until it is corrected.

IndexError

The requested index is out of the sequence range.

Mapping objects, such as dictionaries, rely on keywords (key) to access data values. If you request a dictionary with an incorrect or non-existent key, a KeyError exception will be thrown.

IOError

The operating file does not exist

In our example, we store a value in myInst.bar, which is the bar property of the instance mylnst. Once the property is defined, we can access it using the familiar dot / attribute operator, but if there is no property defined, for example, if we access the foo property, it will result in an AttributeError exception.

At this point, the study of "abnormal knowledge points in Python" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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