问题
After years of research programming in Matlab, I miss the way I could pause a program mid-execution and inspect the variables, do plotting, save/modify data, etc. via the interactive console, and then resume execution.
Is there a way to do the same thing in python?
For example:
# ... python code ...
RunInterpreter
# Interactive console is displayed, so user can inspect local/global variables
# User types CTRL-D to exit, and script then continues to run
# ... more python code ...
This would make debugging a lot easier. Suggestions much appreciated, thanks!
回答1:
Use the pdb
library.
I have this line bound to <F8>
in Vim:
import pdb; pdb.set_trace()
That will drop you into a pdb
console.
The pdb
console isn't quite the same as the standard Python console… But it will do most of the same stuff. Also, in my ~/.pdbrc
, I've got:
alias i from IPython.Shell import IPShellEmbed as IPSh; IPSh(argv='')()
So that I can get into a "real" iPython shell from pdb
with the i
command:
(pdb) i
...
In [1]:
回答2:
The excellent solution I found was to use the 'code' module. I can now call 'DebugKeyboard()' from anywhere in my code and the interpreter prompt will pop-up, allowing me to examine variables and run code. CTRL-D will continue the program.
import code
import sys
def DebugKeyboard(banner="Debugger started (CTRL-D to quit)"):
# use exception trick to pick up the current frame
try:
raise None
except:
frame = sys.exc_info()[2].tb_frame.f_back
# evaluate commands in current namespace
namespace = frame.f_globals.copy()
namespace.update(frame.f_locals)
print "START DEBUG"
code.interact(banner=banner, local=namespace)
print "END DEBUG"
回答3:
The code module contains classes for bringing up a REPL.
回答4:
Check out the Python debugger. In short, you can insert
import pdb; pdb.set_trace()
at any point in your program that you want to debug. (Note that you should remove these in release versions!)
回答5:
pdb is what you're looking for - just put a call to pdb.set_trace()
wherever you want to drop into an debugger.
来源:https://stackoverflow.com/questions/4511763/how-can-i-start-the-python-console-within-a-program-for-easy-debugging