Python3 notes

日期和时间

datetime模块为日期和时间处理同时提供了简单和复杂的方法。

支持日期和时间算法的同时，实现的重点放在更有效的处理和格式化输出。

该模块还支持时区处理:

>>># dates are easily constructed and formatted

>>>from datetime import date

>>> now = date.today()

>>> now

datetime.date(2003,12,2)

>>> now.strftime("%m-%d-%y. %d %b %Y is a %A on the %d day of %B.")

'12-02-03. 02 Dec 2003 is a Tuesday on the 02 day of December.'

>>># dates support calendar arithmetic

>>> birthday = date(1964,7,31)

>>> age = now - birthday

>>> age.days

14368

数据压缩

以下模块直接支持通用的数据打包和压缩格式：zlib，gzip，bz2，zipfile，以及 tarfile。

>>>import zlib

>>> s = b'witch which has which witches wrist watch'

>>> len(s)

41

>>> t = zlib.compress(s)

>>> len(t)

37

>>> zlib.decompress(t)

b'witch which has which witches wrist watch'

>>> zlib.crc32(s)

226805979