import datetime
import decimal

ts = 1523510588.436252000
dts = decimal.Decimal(ts)

dt1=datetime.datetime.utcfromtimestamp(ts)
print(datetime.datetime.strftime(dt1, "%Y-%m-%d-%H:%M:%S.%f"))
dt2=datetime.datetime.utcfromtimestamp(dts)
print(datetime.datetime.strftime(dt2, "%Y-%m-%d-%H:%M:%S.%f"))