from datetime import datetime
now = datetime.now()
print(now)

结果：
2018-12-07 16:05:53.396953

from datetime import datetime
dt = datetime(2019,1,1,00,00)
print(dt)

结果：
2019-01-01 00:00:00

from datetime import datetime
dt = datetime(2019,1,1,00,00)
print(dt.timestamp())

结果：
1546272000.0

from datetime import datetime
t = 1546272000.0
#本地时间
print(datetime.fromtimestamp(t))
#UTC时间
print(datetime.utcfromtimestamp(t))

结果： 
2019-01-01 00:00:00
2018-12-31 16:00:00

from datetime import datetime
sday = datetime.strptime(\'2019-1-1 00:00:00\',\'%Y-%m-%d %H:%M:%S\')
print(sday)

结果：
2019-01-01 00:00:00

from datetime import datetime
now = datetime.now()
print(now.strftime(\'%a, %b %d %H:%M\'))

结果：
Fri, Dec 07 17:08

from datetime import datetime, timedelta
now = datetime.now()
print(now)
m = now + timedelta(2019,1,1,00,00)
print(m)
s = now - timedelta(minutes=10)
print(s)

结果：
2018-12-07 17:18:39.359425
2024-06-17 17:18:40.359426
2018-12-07 17:08:39.359425

from datetime import datetime, timedelta, timezone
utc = timezone(timedelta(hours=8))
now = datetime.now()
print(now)
dt = now.replace(tzinfo=utc)
print(dt)

结果：
2018-12-07 17:21:50.152241
2018-12-07 17:21:50.152241+08:00

from datetime import datetime, timedelta, timezone
utc_dt = datetime.utcnow().replace(tzinfo=timezone.utc)
print(utc_dt)
bj_dt = utc_dt.astimezone(timezone(timedelta(hours=8)))
print(bj_dt)

结果：
2018-12-07 09:28:53.515298+00:00
2018-12-07 17:28:53.515298+08:00

from collections import namedtuple
Person = namedtuple(\'Person\',[\'x\',\'y\'])
p = Person(\'Alice\',12)
print(p.x)
print(p.y)

结果：
Alice
12

from collections import deque
q = deque([\'a\',\'b\',\'c\'])
q.append(\'more\')
q.appendleft(\'h\')
print(q)

结果：
deque([\'h\', \'a\', \'b\', \'c\', \'more\'])

from collections import defaultdict
dd = defaultdict(lambda: \'error\')
dd[\'k1\'] = \'abc\'
print(dd[\'k1\'])
print(dd[\'k2\'])

结果：
abc
error

from collections import Counter
o = Counter()
for ch in \'This world devours every person and moves on.\':
    o[ch] = o[ch] + 1
print(o)

结果：
Counter({\' \': 7, \'o\': 5, \'e\': 5, \'s\': 4, \'r\': 4, \'d\': 3, \'v\': 3, \'n\': 3, \'T\': 1, \'h\': 1, \'i\': 1, \'w\': 1, \'l\': 1, \'u\': 1, \'y\': 1, \'p\': 1, \'a\': 1, \'m\': 1, \'.\': 1})

import  64
a =  64.b64encode(b\'binary\\x00string\')
print(a)
b =  64.b64decode(b\'YmluYXJ5AHN0cmluZw==\')
print(b)

结果：
import  64
a =  64.b64encode(b\'binary\\x00string\')
print(a)
b =  64.b64decode(b\'YmluYXJ5AHN0cmluZw==\')
print(b)

import struct
print(struct.pack(\'>I\',1024))

结果：
b\'\\x00\\x00\\x04\\x00\'

import struct
print(struct.unpack(\'>IH\',b\'\\xf0\\xf8\\xf6\\xf0\\x00\\x80\'))

结果：
(4042847984, 128)