[파이썬] pdb 특정 조건에서만 중단점 설정하기

07 Sep 2023

Debugging is an essential part of software development, and Python provides the pdb module as a built-in debugger. With pdb, you can set breakpoints in your code and step through it to identify and fix issues.

In this blog post, we’ll explore how to set breakpoints in pdb based on specific conditions in your Python code. This can be useful when you only want the debugger to pause execution when certain conditions are met, saving you time and effort in debugging.

Setting a Conditional Breakpoint

To set a breakpoint with a condition in pdb, follow these steps:

Import the pdb module at the beginning of your Python script:
```
import pdb
```
Locate the line of code where you want to set a breakpoint with a condition.
Add the following line of code to set a breakpoint with a condition:
```
pdb.set_trace()
```
Run your Python script, and it will pause execution at the line where you set the breakpoint.
Now, you need to specify the condition for the breakpoint. In the interactive pdb prompt, use the break command followed by the line number and condition:
```
(Pdb) break line_number condition
```
Replace line_number with the actual line number of the code where you set the breakpoint, and condition with the desired condition.

For example, if you want to set a breakpoint at line 10 only when the value of a variable x is greater than 5, you would enter:
```
(Pdb) break 10 x > 5
```
This will set a conditional breakpoint at line 10 that will only pause execution if the condition x > 5 is true.
Continue executing your code by entering the continue command in the pdb prompt.
```
(Pdb) continue
```
The script will resume execution until it reaches the line where the conditional breakpoint is set and the condition evaluates to True.

By setting conditional breakpoints in pdb, you can focus on debugging specific sections of your code that meet certain criteria. This helps narrow down your focus and speeds up the debugging process.

Conclusion

In this blog post, we’ve learned how to set conditional breakpoints using pdb in Python. By setting breakpoints with specific conditions, you can make your debugging process more efficient and targeted. Experiment with conditional breakpoints in your code and see how they can help you debug more effectively.

Happy debugging!