automatic debugger?

[R. Bernstein]

micklee74 at hotmail.com writes:

> hi
> is there something like an automatic debugger module available in
> python? Say if i enable this auto debugger, it is able to run thru the
> whole python program, print variable values at each point, or print
> calls to functions..etc...just like the pdb module, but now it's
> automatic.
> thanks

pydb (http://bashdb.sourceforge.net) has a linetrace option sort of
like what's done in POSIX shells. 

Here's an example:

#!/usr/bin/python
"""Towers of Hanoi"""
import sys,os

def hanoi(n,a,b,c):
    if n-1 > 0:
       hanoi(n-1, a, c, b) 
    print "Move disk %s to %s" % (a, b)
    if n-1 > 0:
       hanoi(n-1, c, b, a) 

i_args=len(sys.argv)
if i_args != 1 and i_args != 2:
    print "*** Need number of disks or no parameter"
    sys.exit(1)

n=3

if i_args > 1:
  try: 
    n = int(sys.argv[1])
  except ValueError, msg:
    print "** Expecting an integer, got: %s" % repr(sys.argv[1])
    sys.exit(2)

if n < 1 or n > 100: 
    print "*** number of disks should be between 1 and 100" 
    sys.exit(2)

hanoi(n, "a", "b", "c")


$ pydb --basename --trace hanoi.py
(hanoi.py:2): 
+ """Towers of Hanoi"""
(hanoi.py:3): 
+ import sys,os
(hanoi.py:5): 
+ def hanoi(n,a,b,c):
(hanoi.py:12): 
+ i_args=len(sys.argv)
(hanoi.py:13): 
+ if i_args != 1 and i_args != 2:
(hanoi.py:17): 
+ n=3
(hanoi.py:19): 
+ if i_args > 1:
(hanoi.py:26): 
+ if n < 1 or n > 100: 
(hanoi.py:30): 
+ hanoi(n, "a", "b", "c")
--Call--
(hanoi.py:5):  hanoi
+ def hanoi(n,a,b,c):
(hanoi.py:6):  hanoi
+     if n-1 > 0:
(hanoi.py:7):  hanoi
+        hanoi(n-1, a, c, b) 
--Call--
(hanoi.py:5):  hanoi
+ def hanoi(n,a,b,c):
(hanoi.py:6):  hanoi
+     if n-1 > 0:
(hanoi.py:7):  hanoi
+        hanoi(n-1, a, c, b) 
--Call--
(hanoi.py:5):  hanoi
+ def hanoi(n,a,b,c):
(hanoi.py:6):  hanoi
+     if n-1 > 0:
(hanoi.py:8):  hanoi
+     print "Move disk %s to %s" % (a, b)
Move disk a to b
(hanoi.py:9):  hanoi
+     if n-1 > 0:
--Return--
(hanoi.py:9):  hanoi
+     if n-1 > 0:
(hanoi.py:8):  hanoi
+     print "Move disk %s to %s" % (a, b)
Move disk a to c
(hanoi.py:9):  hanoi
+     if n-1 > 0:
(hanoi.py:10):  hanoi
+        hanoi(n-1, c, b, a) 
--Call--
(hanoi.py:5):  hanoi
+ def hanoi(n,a,b,c):
(hanoi.py:6):  hanoi
+     if n-1 > 0:
(hanoi.py:8):  hanoi
+     print "Move disk %s to %s" % (a, b)
Move disk b to c
(hanoi.py:9):  hanoi
+     if n-1 > 0:
--Return--
(hanoi.py:9):  hanoi
+     if n-1 > 0:
--Return--
(hanoi.py:10):  hanoi
+        hanoi(n-1, c, b, a) 
(hanoi.py:8):  hanoi
+     print "Move disk %s to %s" % (a, b)
Move disk a to b
(hanoi.py:9):  hanoi
+     if n-1 > 0:
(hanoi.py:10):  hanoi
+        hanoi(n-1, c, b, a) 
--Call--
(hanoi.py:5):  hanoi
+ def hanoi(n,a,b,c):
(hanoi.py:6):  hanoi
+     if n-1 > 0:
(hanoi.py:7):  hanoi
+        hanoi(n-1, a, c, b) 
--Call--
(hanoi.py:5):  hanoi
+ def hanoi(n,a,b,c):
(hanoi.py:6):  hanoi
+     if n-1 > 0:
(hanoi.py:8):  hanoi
+     print "Move disk %s to %s" % (a, b)
Move disk c to a
(hanoi.py:9):  hanoi
+     if n-1 > 0:
--Return--
(hanoi.py:9):  hanoi
+     if n-1 > 0:
(hanoi.py:8):  hanoi
+     print "Move disk %s to %s" % (a, b)
Move disk c to b
(hanoi.py:9):  hanoi
+     if n-1 > 0:
(hanoi.py:10):  hanoi
+        hanoi(n-1, c, b, a) 
--Call--
(hanoi.py:5):  hanoi
+ def hanoi(n,a,b,c):
(hanoi.py:6):  hanoi
+     if n-1 > 0:
(hanoi.py:8):  hanoi
+     print "Move disk %s to %s" % (a, b)
Move disk a to b
(hanoi.py:9):  hanoi
+     if n-1 > 0:
--Return--
(hanoi.py:9):  hanoi
+     if n-1 > 0:
--Return--
(hanoi.py:10):  hanoi
+        hanoi(n-1, c, b, a) 
--Return--
(hanoi.py:10):  hanoi
+        hanoi(n-1, c, b, a) 
--Return--
(hanoi.py:30): 
+ hanoi(n, "a", "b", "c")
--Return--
(<string>:1): 
+  (bdb.py:366):  run
+                 exec cmd in globals, locals