datetime 和calendar 模块里没有直接可以查询到某一个月份总天数等，就写了一个YearMonthDay的class，方便以后调用

YearMonthDay.py

# -*- coding:utf-8 -*-
#！/usr/bin/python

import re
import math
import time
import os
import csv
import sys
import datetime
import calendar


weekdayList = ["Monday", "Tuesday", "Wednesday", "Thursday",
                         "Friday", "Satursday", "Sunday"]

tempList = range(1, 8)
weekdayDic = dict(zip(tempList, weekdayList))
# print weekdayDic


class YearMonthDay(object):
    def __init__(self, someday):
        date_patt = "^(\d{4})(\-|\.|\/)?(\d){1,2}(\-|\.|\/)?(\d){1,2}"
        result = re.search(date_patt, someday)
        self.year = int(result.group(1))
        self.month = int(result.group(3))
        self.day = int(result.group(5))

    def month_days(self):
        """
        Return total days of current month(this instance)
        """
        x = calendar.month(self.year, self.month)
        return int(x.split(" ")[-1].split("\n")[0])

if __name__ == '__main__':
    # anyday = raw_input("请输入需要查询的日期，例如'2014.1.1':")
    anyday = "2014.3.3"
# print month_days(2020, 2)
    thatday = YearMonthDay(anyday)
# print thatday.month_days()
    print "This day is %d(year)%d(month)%d(day)" % \
        (thatday.year, thatday.month, thatday.day)
    print "And it's %s" % (weekdayDic[datetime.datetime.weekday(datetime.date(
        thatday.year, thatday.month, thatday.day)) + 1])

Run result:
{1: 'Monday', 2: 'Tuesday', 3: 'Wednesday', 4: 'Thursday', 5: 'Friday', 6: 'Satursday', 7: 'Sunday'}
This day is 2014(year)3(month)3(day)
And it's Monday
[Finished in 1.2s]