Python 罗列一年的日期

<span style="font-size:18px;">import datetime

tstart_str = '2015-01-01 00:00:00'
tend_str = '2016-01-01 00:00:00' 
dstart = datetime.datetime.strptime(tstart_str, '%Y-%m-%d %H:%M:%S') 
dend = datetime.datetime.strptime(tend_str, '%Y-%m-%d %H:%M:%S') 

now = datetime.datetime.now() 

i = 0
while dstart < dend: 
    print dstart.strftime('%Y-%m-%d')
    
    delta = datetime.timedelta(days=1) 
    
    dstart = dstart + delta     
    i += 1</span>