Python example of pdb usage

pdb_example.py

"""
PDB example.
At (pdb) prompt use: 
    (n)ext +repeat ENTER, 
    (p)rint var 
    (l)ist program, 

    (c)ontinue 
    (q)quit, 
    (s)tep into subroutines, use instead of "n"
    (r)eturn, continue until setp out of subroutine
    
"""
import pdb


def divisors(n):
    res = []
    for i in xrange(2, n-1):
        modulo = n%i
        if modulo == 0:
            res.append(i)
    return res

pdb.set_trace()

a = 10
z = 13
primes = 0
print "#", "Prime?", "Divisors"
for n in xrange(a,z+1):
    dv = divisors(n)
    print n, dv ==[], dv
    if dv == []:
        primes += 1

print primes, "prime numbers found"