Python練習題

1.文件比較. 寫一個比較兩個文本文件的程序. 如果不同, 給出第一個不同處的行號和列號.

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

import os.path
def filecompare():
    i = 0
    j = 0
    while True:
        file1 = raw_input("please input one filename:")
        file2 = raw_input("please input one filename:")
        if (os.path.exists(file1) == False):
            print file1,"is not exists!"
            continue
        if (os.path.exists(file2) == False):
            print file2,"is not exists!"
            continue
        break
    fp1 = open(file1,'r')
    fp2 = open(file2,'r')
    filestr1 = fp1.readlines()
    filestr2 = fp2.readlines()
    for i in range(0,len(filestr1)):
        if filestr1[i] != filestr2[i]:
            for j in range(0,len(filestr1)):
                if filestr1[i][j] != filestr2[i][j]:
                    break
            break
    print "For the first time is different in the %d row in the %d column" %(i+1,j+1)

filecompare()

2.匹配簡單的以“www.”開頭,以“.com”作結尾的 Web 域名,例如:www.yahoo.com. 附加題:使你寫的正則表達式還支持其他頂級域名:.edu, .net 等,比如:www.ucsc.edu.

pattern = r'\bwww\..*\.(com|net|edu)'