The Python Apprentice

Setting explicit breaks

Since we know the problem lies in digits(), let's set an explicit breakpoint in there using the pdb.set_trace() function mentioned earlier:

def digits(x):    """Convert an integer into a list of digits.    Args:      x: The number whose digits we want.    Returns: A list of the digits, in order, of ``x``.    >>> digits(4586378)    [4, 5, 8, 6, 3, 7, 8]    """    import pdb; pdb.set_trace()    digs = []    while x != 0:        div, mod = divmod(x, 10)        digs.append(mod)        x = mod    return digs

Remember that the set_trace() function will halt execution and enter the debugger.

So now we can just execute our script without specifying the PDB module:

% python palindrome.py> /Users/sixty_north/examples/palindrome.py(8)digits()-> digs = [](Pdb)

And we see that we almost ...