I am always receiving an AttributeError

Question

Here is my code:

import time
import datetime
import pytz
print('--'*62)
cont = 0
print('MENU'.center(115))
print('--'*62)
my_timezones = {}
l = list()  # MAIN LIST
l.append('0')
my_timezones['United Arab Emirates'] = pytz.country_timezones['AE']
my_timezones['Canada'] = pytz.country_timezones['CA'][20]
my_timezones['South Korea'] = pytz.country_timezones['KR']
my_timezones['United States'] = pytz.country_timezones['US'][17]
my_timezones['New Zeland'] = pytz.country_timezones['NZ'][0]
my_timezones['Norway'] = pytz.country_timezones['NO']
my_timezones['Ireland'] = pytz.country_timezones['IE']
my_timezones['Netherlands'] = pytz.country_timezones['NL']
my_timezones['Switzerland'] = pytz.country_timezones['CH']
l.append(my_timezones['United Arab Emirates']) 
l.append(my_timezones['Canada']) 
l.append(my_timezones['South Korea'])
l.append(my_timezones['United States'])
l.append(my_timezones['New Zeland']) 
l.append(my_timezones['Norway'])
l.append(my_timezones['Ireland']) 
l.append(my_timezones['Netherlands'])
l.append(my_timezones['Switzerland'])
print(l)
print('Cod   Country                      Timezone')
for c in my_timezones.keys():
    cont+=1
    print(f'{cont}', end='     ')
    print(f'{c}', end='')
    print(f'{my_timezones[c]}'.center(45))
print('--'*62)
while True:
    which = int(input('Which one? '))
    if which == 0:
        break
    else:
        print(f'Local Time: {datetime.datetime.now()}')
        print(f'UTC time: {datetime.datetime.utcnow()}')
        try:
            baby = l[which] 
            timezone = pytz.timezone(baby) # THE LINE WHERE IS NOT WORKING
            time = datetime.datetime.now(tz=timezone)
            print(f'{l[which]} time: {time}')
        except IndexError:
            print('SORRY! WE DIDN´T FIND IT!')
for c in l:
    print(c)`` ``

Then I receive this error:

AttributeError: 'list' object has no attribute 'upper'

I really don´t know how to fix it, because I don´t know even what is the source of the problem, so please I need your help!