Called Functions Not Working

[WhatAmIDoing09]

So I am trying to do Five Nights at Freddy's in real life and I need a calculator to see how much power we have left. But I keep running into a problem. I defined a few functions (Using the lights, closing the doors), and called them, but for some reason when I run the script and try to use them it does not work. It's not an error. I will type the function 'l' when running the code and it gives me: <function l at *Random numbers, letters, and symbols*

import time
power = 100 

power_calc = input("l is left door, r is right door, and f is flashlight. Awaiting Input:")
if len(power_calc) < 0:
        print("empty")

#this is for l
def l():
        if power_calc is 1:
                time_1 = time
def ll():
        if power_calc is ll:
            time_2 = time
            time_total_1 = int(time_1) - int(time_2)
            power - time_total_1  

#this is for r
def r():
        if power_calc is r:
                time_3 = time

def rr():
        if power_calc is rr:
            time_4 = time
            time_total_2 = int(time_3) - int(time_4)
            power - time_total_2

#this is for f
def f():
        power - 2

l()
ll()
r()
rr()
f()

if power == 0:
        print("Game Over")

And this is what it will give me when I run it:

Output:
Python 3.7.0 (v3.7.0:1bf9cc5093, Jun 27 2018, 04:06:47) [MSC v.1914 32 bit (Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> 
 RESTART: C:\Users\Steven & Alisha\AppData\Local\Programs\Python\Python37-32\FNaF power calculator.py 
l is left door, r is right door, and f is flashlight. Awaiting Input:
>>> l
<function l at 0x033A3C90>
>>>