72 mil will get you something like this, with one rebuy. Of course some will say you can do it cheaper. Some will tell you only a full A grade build will do, but that is not what you asked.
61mil is tight. Bare bones.
[Python]
L: 3E/G Pulse Laser
L: 3E/G Pulse Laser
L: 3E/G Pulse Laser
M: 2D/G Cannon
M: 2D/G Cannon
U: 0A Shield Booster
U: 0B Kill Warrant Scanner
U: 0I Chaff Launcher
U: 0A Shield Booster
BH: 1I Lightweight Alloy
RB: 7D Power Plant
TM: 6D Thrusters
FH: 5B Frame Shift Drive
EC: 4D Life Support
PC: 7D Power Distributor
SS: 6A Sensors
FS: 5C Fuel Tank (Capacity: 32)
6: 6D Shield Generator
5: 5A Shield Cell Bank
5: 5A Shield Cell Bank
It will work in RES. Has some stamina, but let's face it, it won't set the universe on fire. You'll be very conscious of those asteroids. Still, gradual upgrading is good fun, and there is a lot of scope for that in the python.
Final bit of advice....you will get to a point when you lust after A7 power. An evil voicw will whisper that you could sell your 110mil python, buy a t9 and then quickly grind out the extra. Been there, got the T-shirt, still scrubbing myself obsessively to rid myself of the taint. Say no to space cows.

.....or not.
Enjoy