With ipython you can write a function, like:
prompt [1]# def parse(line): ip, host = line.split() return "{host} IN PTR {ip}".format(host=host,ip=ip)
To edit our function, just use %edit and reference the line
prompt [2]# %edit 1
Once you modify the function, you cannot reference the newer code with edit, as
prompt [3]# %edit 2
just references “%edit 1” and not the newer code.
In this case we can simply recover the last code of our function with
prompt [4]# from inspect import getsourcelines prompt [5]# getsourcelines(parse) (['def parse(line):\n', ' ip, host = line.split()[:2]\n', ' return "{host} IN PTR {ip}".format(host=host,ip=ip)\n'], 1)