Python debugger cheat-sheet

Before using it:

import pdb

A break point in the code:

pdb.set_trace()

this will stop the interpreter at that point in the code. Just a quick reminder of the most important commands while debugging:

• (Pdb) p <var>: print variable <var>
• (Pdb) l: show current place in the code
• (Pdb) u: move up on the stack
• (Pdb) d: move down on the stack
• (Pdb) n: execute the next statement
• (Pdb) c: continue running (run until the end, or the next breakpoint)
• (Pdb) r: continue running, but only until the end of the current subroutine
• (Pdb) s: step into
• (Pdb) q: quit

A great and more complete reference can be found here