Python核心编程第二版第九章课后练习题

最新推荐文章于 2024-04-14 20:43:35 发布

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最新推荐文章于 2024-04-14 20:43:35 发布 · 264 阅读

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本文详细解答了Python编程第二版第九章的多个练习题，包括文件操作、循环控制、用户交互、文件比较、目录管理和压缩解压等实战内容，适合巩固Python基础操作。

""" 9-1 """
f=open('test.txt','r')
for i in f:
    if i[0:1]=='#':
        continue
    print(i)
f.close()

""" 9-1-1 """
import re
def isNote(str):
    m=re.match(r'^[ ]*#',str)
    if m is None:
        return False
    else:
        return True
f=open('test.txt','r')
for i in f:
    if isNote(i):
        continue
    print(i)
f.close()

""" 9-2 """
n=int(input('enter a number: '))
filename=input('enter a file name: ')
j=1
f=open(filename,'r')
for i in f:
    if j>n:
        break
    print(i)
    j+=1
f.close()

""" 9-3 """
filename=input('enter a file name: ')
f=open(filename,'r')
l=[i for i in f]
print(len(l))
# print(len([i for i in f]))
j=0
for i in f:
   j+=1
print(j)
f.close()

""" 9- 4 """
filename=input('enter a file name: ')
f=open(filename,'r',encoding='utf-8')
j=1
for i in f:
    # print(j,j%26)
    print( i)
    if j % 25 == 0:
        c = input('press anykey to continue...')
        if c !='':
            continue
    j+=1
f.close()

""" 9-5 """


""" 9-6 """
f1=open('test.txt','r')
f2=open('test1.txt','r')
flag=True
r=1
while True:
    try:
        line1=next(f1)
        line2 = next(f2)
    except(StopIteration):
        print(r,1)
        break
    for i in range(0,min(len(line1),len(line2))):
        # print(line1[i],' ', line2[i])
        if line1[i]!=line2[i]:
            print(r,i+1)
            flag=False
            break
    if not flag:
        break
    r+=1

""" 9-7 """
import os
f=open('C:\Windows\win.ini','r')
basedir='D:\PycharmProjects\pythonProject\ccdata'
dir='practice9'
os.chdir(basedir)
if not os.path.isdir(dir):
    os.mkdir(dir)
os.chdir(dir)
# print(os.getcwd())
for i in f:
    filename=''
    item=[]
    if i[0:1]=='[':
        i=i[1:len(i)-2]
        filename=i.split(' ')[0]
        try:
            if file:
                file.close()
                print(file.closed)
        except(NameError):
            pass
        file = open(filename, 'w')
        # print(filename)
    elif i[0:1] !=';':
        item=i.split('=')
        file.write('%s  %s' % (item[0], item[1]))
        # print(item)

""" 9-12-1 """
import time
import operator
import base64
import re
import os
import pickle
def now_to_time(t):
    return time.strftime("%Y/%m/%d %H:%M:%S",time.localtime(t))
def str_to_time(t):
    timeArray= time.strptime(t,"%Y/%m/%d %H:%M:%S")
    return int(time.mktime(timeArray))
def loginuser():
    p='Enter login name,case_insensitive: '
    while True:
        name=input(p).strip().lower()
        icon=re.search(r'\W',name)
        print(name,len(name))
        if len(name)==0:
            p='Name is space,try again : '
            continue
        elif icon!=None:
            p = 'Name contains icon,try again : '
            continue
        else:
            break
    if name not in tbp:
        iswant=input('Are you want a