EXPERIMENT 4-MIN MAX TEMPERATURE

#Write a program so it displays the temperature in Fahrenheit as well as the maximum and minimum temperatures it has seen.

import time
import os

base_dir="/sys/bus/w1/devices/28-000008bdd91e/w1_slave"

def read_temp_raw():
    f = open(base_dir, "r")
    lines = f.readlines()
    f.close()
    return lines

temp=[]

def read_temp():
    lines = read_temp_raw()
    
    while lines[0].strip()[-3:] ==  "YES":
        time.sleep(1)
        lines = read_temp_raw()
        equal_pos = lines[1].find("t=")
        
        if equal_pos != -1:
            temp_string=lines[1][equal_pos+2:]
            temp_c=float(temp_string)/1000
            temp_f=temp_c*(9.0/5.0)+32.0
            temp.append(temp_f)
            return(temp_f)

try:    
    while True:
        print(read_temp())

except KeyboardInterrupt:
        max=temp[0]
        min=temp[0]
        print('Readings: ',temp)
        for i in (temp):
            if(i>max):
                max=i
        for i in (temp):
            if(i<min):
                min=i
        print('min: ',min)
        print('max: ',max)