import time
time.localtime() ---返回当前时间元组
例如：
>>> time.localtime()
time.struct_time(tm_year=2013, tm_mon=3, tm_mday=23, tm_hour=18, tm_min=22, tm_sec=13, tm_wday=5, tm_yday=82, tm_isdst=0)

time.strftime() --返回时间字符串

strftime(...)
    strftime(format[, tuple]) -> string

    Convert a time tuple to a string according to a format specification.
    See the library reference manual for formatting codes. When the time tuple
    is not present, current time as returned by localtime() is used.

省略tuple参数，默认是使用当前时间元组
例如：
>>> time.strftime('%Y-%m-%d %X')
'2013-03-23 18:18:09'

time.strptime() --根据格式返回时间元组
    strptime(string, format) -> struct_time

    Parse a string to a time tuple according to a format specification.
    See the library reference manual for formatting codes (same as strftime()).
例如：
>>> time.strptime('2013-3-24', '%Y-%m-%d')
time.struct_time(tm_year=2013, tm_mon=3, tm_mday=24, tm_hour=0, tm_min=0, tm_sec=0, tm_wday=6, tm_yday=83, tm_isdst=-1)

datetime类：
>>> help(datetime.datetime)
Help on class datetime in module datetime:

class datetime(date)
| datetime(year, month, day[, hour[, minute[, second[, microsecond[,tzinfo]]]]])
|
| The year, month and day arguments are required. tzinfo may be None, or an
| instance of a tzinfo subclass. The remaining arguments may be ints or longs.
|

Example:
import datetime
>>> datetime.datetime(2013, 3 ,24)
datetime.datetime(2013, 3, 24, 0, 0)
>>> print datetime.datetime(2013, 3 ,24)
2013-03-24 00:00:00

>>> import datetime
>>> now = datetime.datetime.now()
>>> now
datetime.datetime(2008, 12, 13, 14, 9, 39, 2731)
>>> print now
2008-12-13 14:09:39.002731

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