Shulou(Shulou.com)06/01 Report--

Xiaobian to share with you how python debugging program crash in Shell, I hope you have something to gain after reading this article, let's discuss it together!

Debugging program crashes in Shell

If you're someone who refuses to use an IDE and codes in Vim or Emacs, you might come across a situation where it would be useful to have a debugger like that in an IDE.

You know what? You have a--just run your program with python 3.8-i--and once your program terminates, -i launches an interactive shell where you can view all the variables and call functions. Neat, but what about using the actual debugger (pdb )? Let's use the following procedure

(script.py )：def func(): return 0 / 0 func()

And run the script using python3.8 -i script.py:

# Script crashes... Traceback (most recent call last): File "script.py", line 4, in func() File "script.py", line 2, in func return 0 / 0 ZeroDivisionError: division by zero >>> import pdb >>> pdb.pm() # Post-mortem debugger > script.py(2)func() -> return 0 / 0 (Pdb)

We see where the crash occurred, now let's set a breakpoint:

def func(): breakpoint() # import pdb; pdb.set_trace() return 0 / 0 func()

Now run it again:

script.py(3)func() -> return 0 / 0 (Pdb) # we start here (Pdb) step ZeroDivisionError: division by zero > script.py(3)func() -> return 0 / 0 (Pdb)

Most of the time, printing statements and error messages is enough for debugging, but sometimes you need to fumble around to understand what is going on inside your program. In these cases, you can set a breakpoint, and the program execution will stop at the breakpoint. You can inspect the program, such as listing function parameters, evaluating expressions, listing variables, or simply stepping as shown above.

After reading this article, I believe you have a certain understanding of "how python debugs program crashes in Shell". If you want to know more about it, please pay attention to the industry information channel. Thank you for reading!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.