TO DIFF TIMEZONE:
In [39]: from pprint import pprint
    ...: import pytz
    ...: from datetime import datetime
    ...:
    ...: a = [["tehran", str(datetime.now())], ["turkey", str(datetime.now())], ["toronto", str(datetime.now())]]
    ...: result = []
    ...: for i,d in enumerate(a):
    ...:     #if i == 0:
    ...:     #    result.append([d[0], datetime.strptime(d[1], "%Y-%m-%d %H:%M")])
    ...:     #    continue
    ...:     timezone = [x for x in pytz.all_timezones if d[0] in x.lower()][0]
    ...:     print(timezone)
    ...:     datetime = datetime.strptime(d[1], "%Y-%m-%d %H:%M:%S.%f")
    ...:     #datetime = d[1]
    ...:     result.append([d[0], datetime.astimezone(pytz.timezone(timezone))])
    ...: pprint(result)
    ...:
Asia/Tehran
Turkey
America/Toronto
[['tehran',
  datetime.datetime(2018, 10, 20, 17, 35, 11, 609910, tzinfo=<DstTzInfo 'Asia/Tehran' +0330+3:30:00 STD>)],
 ['turkey',
  datetime.datetime(2018, 10, 20, 17, 5, 11, 609917, tzinfo=<DstTzInfo 'Turkey' +03+3:00:00 STD>)],
 ['toronto',
  datetime.datetime(2018, 10, 20, 10, 5, 11, 609918, tzinfo=<DstTzInfo 'America/Toronto' EDT-1 day, 20:00:00 DST>)]]


ALL TO TIMEZONE:
In [52]: from pprint import pprint
    ...: import pytz
    ...: from datetime import datetime
    ...: a = [["tehran", "2018-10-15 12:00"], ["turkey", "2018-10-15 14:30"], ["toronto", "2018-10-15 18:30"]]
    ...: result = []
    ...: for i,d in enumerate(a):
    ...:     #if i == 0:
    ...:     #    result.append([d[0], datetime.strptime(d[1], "%Y-%m-%d %H:%M")])
    ...:     #    continue
    ...:     timezone = [x for x in pytz.all_timezones if d[0] in x.lower()][0]
    ...:     datetime1 = datetime.strptime(d[1], "%Y-%m-%d %H:%M")
    ...:     datetime1.replace(tzinfo=pytz.timezone(timezone))
    ...:     g = datetime1.astimezone(pytz.timezone(timezone))
    ...:     result.append([d[0], g.astimezone(pytz.timezone('UTC'))])
    ...: pprint(result)
    ...:
[['tehran', datetime.datetime(2018, 10, 15, 8, 30, tzinfo=<UTC>)],
 ['turkey', datetime.datetime(2018, 10, 15, 11, 0, tzinfo=<UTC>)],
 ['toronto', datetime.datetime(2018, 10, 15, 15, 0, tzinfo=<UTC>)]]