datetime处理日期和时间

1.

>>> from datetime import datetime
>>> datetime.now()
datetime.datetime(2017, 10, 1, 19, 25, 9, 835498)
>>> datetime.utcnow()
datetime.datetime(2017, 10, 1, 11, 25, 22, 523224)

>>> datetime(2017,5,23,12,20)
datetime.datetime(2017, 5, 23, 12, 20)

2.

from datetime import datetime
a=datetime.strptime('2017/9/30','%Y/%m/%d')
print(a)
a1=datetime.strptime('2017年9月30日星期六','%Y年%m月%d日星期六')
print(a1)
a2=datetime.strptime('2017年9月30日星期六8时42分24秒','%Y年%m月%d日星期六%H时%M分%S秒')
print(a2)
a3=datetime.strptime('9/30/2017','%m/%d/%Y')
print(a3)
a4=datetime.strptime('9/30/2017 8:42:50','%m/%d/%Y %H:%M:%S')
print(a4)

3.

from datetime import datetime
dt=datetime(2017,10,1,10,3,43)
a=dt.strtime('%Y年%m月%d日%A,%H时%M分%S秒')
print(a)
b=dt.strtime('%A,%B %d,%Y')
print(b)
c=dt.strtime('%m/%d/%Y %I:%M:%S%p')
print(c)
d=dt.strtime('%B %d,%Y')
print(d)

4.

from datetime import datetime
now=datetime(2017,9,30)
a=now.strftime('today is %Y,%m,%d')
print(a)
b=now.strftime('today is the %w day of this week')
print(b)
c=now.strftime('today is the %j day of this year')
print(c)
d=now.strftime('this week is the %W week of this year')
print(d)
e=now.strftime('today is the %d day of this month')
print(e)

第四个那个我输入中文会报错。embedded null byte。不知如何解决。