python核心編程第九章練習

9-2

#!/user/bin/env python
# -*- coding:utf-8 -*-

F = raw_input('Enter a filename ')
N = int(raw_input('Enter lines to display '))
filename = file(F, 'r')
for eachLine in filename:
    if N != 0:
        print eachLine
        N -= 1

filename.close()

9-3

#!/user/bin/env python
# -*- coding:utf-8 -*-

filename = raw_input('Enter a filename ')
n = 0
filename = file(filename, 'r')
for eachLine in filename:
    n = n + 1
    filename.close()
print n

9-4

#!/user/bin/env python
# -*- coding:utf-8 -*-

filename = raw_input('Enter a filename ')
n = 0
filename = file(filename, 'r')
for eachLine in filename:
	print eachLine
	n += 1
	if n % 25 == 0:
		raw_input("Press any key to continue ")
filename.close()

9-5

#!/user/bin/env python
# -*- coding:utf-8 -*-

import random
import string
srstring = string.letters
f1 = open('source.txt', 'w')
for i in range(0, 10):
    name = ''
    length = random.randint(5, 10)
    for j in range(length):
        name += random.choice(srstring)
    score = random.randint(20, 100)
    score = str(score)
    outstring = name + ' ' + score + '\n'
    f1.write(outstring)
f1.close()
f1 = open('source.txt', 'r')
sum1 = 0
n = 0
for each_line in f1:
    sum1 += int(each_line.split()[1])
    n += 1
print sum1, sum1 / n
f1.seek(0)
print sum(int(line.split()[1]) for line in f1)
f1.close()

9-6

#!/user/bin/env python
# -*- coding:utf-8 -*-

file1 = [line for line in file('9-1.py', 'r')]
file2 = [line for line in file('9-2.py', 'r')]
len1 = len(file1)
len2 = len(file2)
len_min = min(len1, len2)
for row in range(len_min):
	if file1[row] != file2[row]:
		words1 = [word for word in file1[row]]
		words2 = [word for word in file2[row]]
		len1 = len(words1)
		len2 = len(words2)
		len_min = min(len1, len2)
		for colomn in range(len_min):
			if words1[colomn] != words2[colomn]:
				break
		print 'Diff in row[%s], colomn[%s]'%((row+1),(colomn+1))
		break
	else:
		print 'It is total same file.'

9-9

#!/user/bin/env python
import os
has=[]
nhas=[]
def doc_string():
    os.chdir('C:\Python27\Lib')
    cwd=os.getcwd()
    #print cwd
    doclist=os.listdir(cwd)
    for d in doclist:
        path = os.path.join(cwd,d)
        #print path
        if os.path.isfile(path):
            h_doc=0
            fp=open(path,'r')
            for line in fp:
                if '\'\'\'' in line:
                    has.append(path)
                    h_doc=1
                    break
            if h_doc==0:
                nhas.append(path)
            fp.close()
    print "doc has __doc__:",has
    print "\ndoc hasn't __doc__:",nhas
                        
doc_string()

9-12

#!/user/bin/env python
# -*- coding:utf-8 -*-

import time, getpass, hashlib, shelve

# 用字典作爲數據庫
db = shelve.open('userpw2.shelve')


# 此函數用於註冊
def sigup():
    # 寫一個提示標語
    prompt = '>New user sigup first: '
    while True:
        # 輸入賬號
        user = raw_input(prompt).lower()
        # 如果數據庫中已經有了賬號，提示重新輸入
        if user in db:
            prompt = '>The user is existing, try another.'
            continue  # 回到循環處繼續循環
        elif not user.isalnum() or ' ' in user:
            print 'Invalid: username'
            continue
        else:
            break  # 否則跳出循環
    # 輸入密碼
    psw = getpass.getpass()
    # 把賬號和密碼加入數據庫中
    timeNow = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time.time()))
    db[user] = hashlib.md5(psw).hexdigest(), timeNow
    print '>You has already sigup, return to login page.>>>'


# 此函數用於登錄
def login():
    # 寫一個提示標語
    prompt = '>New user sigup first(sigup) || Existing user: Enter your username\n>'
    while True:
        # 輸入賬號密碼
        user = raw_input(prompt).lower()
        if 'sigup' in user:
            sigup()
        psw = getpass.getpass()
        # 判斷輸入密碼是否正確，正確則跳出循環，否則繼續循環
        if db.has_key(user) and db.get(user)[0] == hashlib.md5(psw).hexdigest():
            break
        else:
            prompt = '>Password or username is not right, try again.\n>New user sigup first(sigup) || Existing user enter your username\n> '
            continue
    timeNow = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time.time()))
    db[user] = hashlib.md5(psw).hexdigest(), timeNow
    diffTime = float(time.time() - time.mktime(time.strptime(db[user][1],'%Y-%m-%d %H:%M:%S'))) / 3600
    if diffTime <= 4:
        print 'You already logged in at: ', db[user][1]
    print '>***Welcome, %s!***' % user


def manage():
    prompt = '>(D)elete a user\n>(S)how all user\n>(O)ut put\n>(Q)uit\n>'
    done = False
    while not done:
        # 是否要跳出選擇
        chosen = False
        while not chosen:
            try:
                choice = raw_input(prompt).strip()[0].lower()
            except (EOFError, KeyboardInterrupt):
                choice = 'q'
            print '\nYou picked: [%s]' % choice
            if choice not in 'sdqo':
                print '>Invalid option, try again!'
            else:
                chosen = True

        if choice == 'd':
            user = raw_input('>Enter the user which you want to delete: ')
            if user in db:
                del db[user]
                print '>Remove %s ... Done!' % user
            else:
                print '>User has no name: %s ' % user
        if choice == 's':
            for user in db:
                print user
        if choice == 'q':
            done = True


# 此函數用於展示輸入和作爲引擎
def showmunue():
    # 展示你可以輸入的標語
    prompt = """
    (S)igup
    (L)ogin
    (M)anage
    (Q)uit

    >Enter your choice: """
    # 是否要跳出循環
    done = False

    while not done:
        # 是否要跳出選擇
        chosen = False
        while not chosen:
            try:
                choice = raw_input(prompt).strip()[0].lower()
            except (EOFError, KeyboardInterrupt):
                choice = 'q'
            print '\nYou picked: [%s]' % choice
            if choice not in 'slmq':
                print '>Invalid option, try again!'
            else:
                chosen = True

        if choice == 'q':
            done = True
        if choice == 's':
            sigup()
        if choice == 'm':
            manage()
        if choice == 'l':
            login()

if __name__ == '__main__':
    showmunue()
    db.close()

9-15

rse.ArgumentParser()
parser.add_argument("file_A")
parser.add_argument("file_B")
parser.add_argument("-c", "--copy", action="store_true",
                    help="copy file A to file B")
args = parser.parse_args()

if args.copy:
    fileA = open(args.file_A, 'r+')
    fileB = open(args.file_B, 'w+')
    fileB.write(fileA.read())
    fileA.close()
    fileB.close()

9-16

fsource = open("4-1.txt", "r")
ftarget = open("filetest.txt", 'w+')



for line in fsource:
    if len(line)-1 <= 80:
        ftarget.write(line)
    else:
        writeline = line
        while len(writeline)-1 > 80:
            i = 79
            while i >= 0:
                if writeline[i] in [' ', ',', ':', ';', '.', '!']:
                    ftarget.write(writeline[0:i+1] + '\n')
                    writeline = writeline[i+1:]
                    break;
                i -= 1
        ftarget.write(writeline)
                
fsource.close()
ftarget.close()

9-17

#!/user/bin/env python
# -*- coding:utf-8 -*-

import os

def create():
    filename = raw_input('Filename need:').strip()
    cwd = os.getcwd()
    filelist = os.listdir(cwd)
    if filename in filelist:
        print 'Filename already taken, try another'
    else:
        newfile = open(filename, 'w+')
        content = raw_input('Write something:')
        newfile.write(content)
        newfile.close()

def display():
    filename = raw_input('Filename need:').strip()
    cfile = open(filename, 'r')
    for row, line in enumerate(cfile):
        print row, line 
    cfile.close()

def edit():
    filename = raw_input('Filename need:').strip()
    cfile = open(filename, 'r+')
    linenum = raw_input('Enter the num of line you want to edit:')
    buffer_file = open('test.txt', 'w+')
    for row, line in enumerate(cfile):
        if row == int(linenum):
            line = raw_input('Edit content:')
        buffer_file.write(line)
    buffer_file = open('test.txt', 'r')
    cfile = open(filename, 'w+')
    cfile.write(buffer_file.read())
    cfile.close()
    buffer_file.close()

def save():
    pass

def showmunue():
    # 展示你可以輸入的標語
    prompt = """
    (C)reate a file
    (D)isplay a file
    (E)dit file
    (S)ave
    (Q)uit
    >Enter your choice: """
    # 是否要跳出循環
    done = False

    while not done:
        # 是否要跳出選擇
        chosen = False
        while not chosen:
            try:
                choice = raw_input(prompt).strip()[0].lower()
            except (EOFError, KeyboardInterrupt):
                choice = 'q'
            print '\nYou picked: [%s]' % choice
            if choice not in 'cdesq':
                print '>Invalid option, try again!'
            else:
                chosen = True

        if choice == 'q':
            done = True
        if choice == 'c':
            create()
        if choice == 'd':
            display()
        if choice == 'e':
            edit()
        if choice == 's':
            save()

if __name__ == '__main__':
    showmunue()

9-18

fn=raw_input("file:")
n=int(raw_input("num:").strip())
char=chr(n)

fp=open(fn,'r')
all_line=fp.readlines()
fp.close()

context=''.join(all_line)
cnt=context.count(char)
print cnt

9-19

import random


def radint_bin_file(value, counting, lens):
    ran_lens = lens - counting
    rans = []
    n = 0
    while n < ran_lens:
        ran = random.randint(0, 255)
        if ran == value:
            continue
        else:
            rans.append(chr(ran))
            n += 1
    for i in range(counting):
        rans.insert(random.randint(0, ran_lens), chr(value))
    filename = open(r'radombin.txt', 'wb')
    filename.write(''.join(rans))
    filename.close()

radint_bin_file(65, 5, 38)
filename = open(r'radombin.txt', 'rb')
for i in filename:
    print i 
filename.seek(0, 0)
print len(filename.readlines()[0])
filename.close()

9-20

import gzip
import shutil


with open('filetest.txt', 'rb') as f_in, gzip.open('filetest.txt.gz', 'wb') as f_out:
    shutil.copyfileobj(f_in, f_out)

9-21

import zipfile


def zip_create():
    zipname = raw_input('zipname: ')
    myzip = zipfile.ZipFile(zipname)
    myzip.close()

def zip_add():
    zipname = raw_input('zipname: ')
    myzip = zipfile.ZipFile(zipname, 'a')
    filename = raw_input('filename: ')
    myzip.write(filename)

def zip_extra():
    zipname = raw_input('zipname: ')
    myzip = zipfile.ZipFile(zipname, 'a')
    filename = raw_input('filename: ')
    myzip.extract(filename)

9-22

me, zipfile


zipname = raw_input('zipname: ')
print 'zip file size: %d bytes' % (os.stat(zipname).st_size)
myzip = zipfile.ZipFile(zipname, 'r', 8)
print 'filename\tdatetime\t\t size  compress size\trate'
for info in myzip.infolist():
    t = time.ctime(time.mktime(tuple(list(info.date_time) + [0, 0, 0])))
    rate = float(info.compress_size) / info.file_size * 100
    print '%s\t%s %d\t%d\t\t%.2f%%' % (info.filename, t,
        info.compress_size, info.file_size, rate)
myzip.close()

9-23

import tarfile


def tar_create():
    tarname = raw_input('tarname: ')
    mytar = tarfile.open(zipname, 'w:gz')
    mytar.close()

def tar_add():
    tarname = raw_input('tarname: ')
    mytar = tarfile.open(zipname, 'w:gz')
    filename = raw_input('filename: ')
    mytar.add(filename)
    mytar.close()

def tar_extra():
    tarname = raw_input('tarname: ')
    mytar = tarfile.open(zipname, 'r:gz')
    filename = raw_input('filename: ')
    mytar.extractall()
    mytar.close()