How do I manipulate a variable whose name conflicts with PDB commands?

问题

My code is, for better or worse, rife with single letter variables (it's physics stuff, so those letters are meaningful), as well as NumPy's, which I'm often interacting with.

When using the Python debugger, occasionally I'll want to look at the value of, say, n. However, when I hit n<enter>, that's the PDB command for (n)ext, which has a higher priority. print n works around looking at it, but how can I set it?

回答1:

Use an exclamation mark ! before a statement to have it run :

python -m pdb test.py
> /home/user/test.py(1)<module>()
-> print('foo')
(Pdb) !n = 77
(Pdb) !n
77
(Pdb) n
foo
> /home/user/test.py(2)<module>()
-> print('bar')
(Pdb)

The docs say:

! statement

Execute the (one-line) statement in the context of the current stack frame. The exclamation point can be omitted unless the first word of the statement resembles a debugger command. [...]

回答2:

You can use semicolons, so just put something else in front of it:

ipdb> print n
2
ipdb> n
> 145 <some code here>
  146
  147

ipdb> 1; n=4
1
ipdb> print n
4

回答3:

That is not the direct answer to your question, but it may help you: PuDB is a console-based visual interface for PDB which separates commands from variable manipulation by design.

回答4:

Eric IDE, Wing IDE & Spyder to mention just a few all have visual debuggers that are worth a go as they separate the display of values from the commands.

来源：https://stackoverflow.com/questions/21123473/how-do-i-manipulate-a-variable-whose-name-conflicts-with-pdb-commands