Debugging skills in Python web development

In Python web development, debugging is an inevitable task. Debugging can help us quickly find problems and solve them, improving development efficiency. Here are some debugging skills in Python web development.

1. Use the print statement

The simplest debugging technique in Python is to use the print statement to verify the correctness of the program by outputting variable values or some key information. In web development, we can use the print statement in the view function to output some parameters of the request, such as the request path, request method, request header, etc. By viewing the output information, you can quickly locate problems in the request, such as errors in request paths, parameters, etc.

2. Use the pdb debugger

The pdb debugger that comes with Python can help us pause execution during program execution, view variable values and trace function call stacks, thereby quickly locating program problems. . In web development, we can add the pdb.set_trace() statement to the code to use the pdb debugger.

The steps to use the pdb debugger are as follows:

(1) Insert the pdb.set_trace() statement at the location that needs to be debugged;

(2) Run the program, in pdb Enter commands such as n (next step) or s (enter inside the function) in the debugger to execute the code step by step;

(3) When you need to view the variable value, enter the p variable name command to view the variable value.

3. Use logs

Logs can help us record some key events and exceptions in the program, so as to better track the execution of the program. In web development, we can use Python's logging module to record log information. By viewing the log information, you can quickly find problems in the program and locate the problem.

The steps to use the logging module are as follows:

(1) Import the logging module and perform some configurations, such as setting the log level, output format, etc.;

(2) In the code Use logging.debug(), logging.info(), logging.warning() and other functions to output log information;

(3) View the information output by the log file or console to locate program problems.

4. Use the test framework

The test framework can help us write unit tests, integration tests and other test cases, and automatically run these test cases to verify the correctness of the program. In Python web development, we can use the testing framework that comes with the Django framework, or other third-party testing frameworks (such as pytest).

The steps to use the test framework are as follows:

(1) Write test cases, including test functions, test data, etc.;

(2) Run the test cases and check the test results Whether it meets expectations;

(3) Fix problems in the program based on test results.

Summary

Debugging skills in Python web development include using print statements, pdb debugger, logging and testing frameworks, etc. Debugging can help us quickly find problems in the program and improve development efficiency. In actual development, we can combine a variety of debugging techniques to better locate and solve program problems.

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