Python debugger: Stepping into a function that you have called interactively

And I’ve answered my own question! It’s the “debug” command in pydb:

~> cat -n /tmp/test_python.py
     1  #!/usr/local/bin/python
     2
     3  def foo():
     4      print "hi"
     5      print "bye"
     6
     7  exit(0)
     8

~> pydb /tmp/test_python.py
(/tmp/test_python.py:7):  <module>
7 exit(0)


(Pydb) debug foo()
ENTERING RECURSIVE DEBUGGER
------------------------Call level 11
(/tmp/test_python.py:3):  foo
3 def foo():

((Pydb)) s
(/tmp/test_python.py:4):  foo
4     print "hi"

((Pydb)) s
hi
(/tmp/test_python.py:5):  foo
5     print "bye"


((Pydb)) s
bye
------------------------Return from level 11 (<type 'NoneType'>)
----------------------Return from level 10 (<type 'NoneType'>)
LEAVING RECURSIVE DEBUGGER
(/tmp/test_python.py:7):  <module>