python基础的几个小练习题

题目：

1、写一个程序，判断2008年是否是闰年。

2、写一个程序，用于计算2008年10月1日是这一年的第几天？（2008年1月1日是这一年的第一天）

3、（文件题）有一个“record.txt”的文件，内容如下：

# name, age, score

tom, 12, 86

Lee, 15, 99

Lucy, 11, 58

Joseph, 19, 56

第一栏为姓名(name)，第二栏为年纪(age)，第三栏为得分(score)

现在，写一个Python程序，

1）读取文件

2）打印如下结果：

得分低于60的人都有谁？

谁的名字以L开头？

所有人的总分是多少?

3）姓名的首字母需要大写，该record.txt是否符合此要求？ 如何纠正错误的地方？

4、（练习正则表达式）有一个文件，文件名为output_1981.10.21.txt 。下面使用Python： 读取文件名中的日期时间信息，并找出这一天是周几。将文件改名为output_YYYY-MM-DD-W.txt (YYYY:四位的年，MM：两位的月份，DD：两位的日，W：一位的周几，并假设周一为一周第一天)

以下是程序清单：

 #-*-coding:utf-8 -*-

 # (1) judge leap year
 def judge_leap_year(n):
     # if n%4 == 0 and n%100 != 0:
     #     return True
     # if n%100 == 0 and n%400 == 0:
     if (n%4 == 0 and n%100 != 0) or (n%100 == 0 and n%400 == 0):
         return True
     else:
         return False

 # ===================================================================
 # (2) computing the sum days of any day(**.**.**)
 def compute_year_counts(datestr):
     # deal with these case:
     # 2012.12.2
     # 2012/12/2
     # 2012-12-2
     if datestr.find('.') > 0: date = datestr.split('.')
     if datestr.find('/') > 0: date = datestr.split('/')
     if datestr.find('-') > 0: date = datestr.split('-')

     year = int(date[0])
     month = int(date[1])
     day = int(date[2])
     if (month < 1 or month > 12):
         print "the error month!"
         return -1
     if (day > 31):
         print "the error day!"
         return -1

     days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]

     # nDays = 0
     # i = 1
     # while i < month:
     #     nDays += days[i-1]
     #     i = i + 1
     nDays = sum(days[i] for i in range(0, month - 1))
     if (judge_leap_year(year)):
         nDays += 1
     return nDays + day 

 datestring = raw_input("input the datetime info:-->")
 print compute_year_counts(datestring)

 # ===================================================================
 # (3) read and write file: use class if perfect!
 class UserProfier(object):
     def __init__(self, name, age, score):
         self.name = name
         self.age = age
         self.score = score

 def read_file_and_anlysis(filetext):
     line_read = []
     user_scores = []
     has_invalid_name = False #the invalid name

     for line in filetext:
         if not line.startswith('#') and len(line.strip()) != 0:
             if line[0].islower():
                 line = line[0].upper() + line[1:]
                 has_invalid_name = True
             cur = line.strip().split(', ')
             user_scores.append(UserProfier(cur[0], int(cur[1]), int(cur[2])))
             line_read.append(line)
     # print the file
     print "print the file"
     for i in line_read:
         print i
     # statistic the score < 60
     print "users whose score lower 60:"
     for scores in filter(lambda s: s.score < 60 , user_scores):
         print scores.name
     # statistic the begin of name which is 'L'
     print "users whose name's begin is 'L':"
     for names in filter(lambda s: s.name.startswith('L'), user_scores):
         print names.name
     # statistic the total scores of all one
     print "the total scores of everyone:"
     allscores = map(lambda s:s.score, user_scores)
     print allscores
     print reduce(lambda x, y: x+y, allscores, 0)

 # open the file
 with open("record.txt") as f:
     read_file_and_anlysis(f)

 # ===================================================================
 # (4) the useful example of regular expression
 import os, re, datetime

 filename = "output_1981.10.21.txt"

 date_time = re.search("(?P<year>\d{4})\.(?P<month>\d{2})\.(?P<day>\d{2})\.", filename)

 year = date_time.group('year')
 month = date_time.group('month')
 day = date_time.group('day')

 print year, month, day
 date = datetime.date(int(year), int(month), int(day))
 w = date.weekday() + 1
 W = str(w)
 os.rename(filename, "output_"+year+'-'+month+'-'+day+'-'+str(w)+".txt")