Python核心编程-第九章-习题
1.
# -*- coding:utf-8 -*-
filename = raw_input(u"请输入文件名: ".encode('gbk'))
fobj = open(filename)
for eachline in fobj:
if eachline.startswith('#'):
continue
elif '#' in eachline:
print eachline[:eachline.index('#')]
else:
print eachline,
2.
# -*- coding:utf-8 -*-
filename = raw_input(u"请输入要打开的文件名".encode('gbk'))
try:
fobj = open(filename)
except:
print u"文件不存在，请验证！！"
lines = int(raw_input(u"请输入一个数字，以显示文件的前若干行".encode('gbk')))
filecontent = fobj.readlines()
filelines = len(filecontent)
if lines <= filelines:
for eachline in filecontent[:lines]:
print eachline,
else:
print u"需打印内容超出文件大小！该文件只有%d行，下面将打印该文件全部内容！" % len(filecontent)
for eachline in filecontent:
print eachline,
3.
# -*- coding:utf-8 -*-
filename = raw_input(u"请输入要打开的文件名".encode('gbk'))
try:
fobj = open(filename)
except:
print u"文件不存在，请验证！！"
filelines = len(fobj.readlines())
print u"文件共有 %d 行！" % filelines
4.
# -*- coding:utf-8 -*-
filename = raw_input(u"请输入要打开的文件名".encode('gbk'))
try:
fobj = open(filename)
except:
print u"文件不存在，请验证！！"
filecontent = fobj.readlines()
filelines = len(filecontent)
print u"文件共有 %d 行！" % filelines
i = 1
while i <= filelines:
print filecontent[i-1],
if i % 25 == 0:
prompt = u"已经打印 %d 行，按任意键继续！" % i
raw_input(prompt.encode('gbk'))
i += 1
continue
i += 1
print u"文件打印完毕！"
5.
# -*- coding:utf-8 -*-
# 本例中，学生的成绩存放于Excel表格中，其中第一列为姓名、第二列为成绩
from __future__ import division
import xlrd
filename = raw_input(u"请输入存放成绩的表格文件名".encode('gbk'))
data = xlrd.open_workbook(filename)
table = data.sheets()[0]
name = table.col_values(0)[1:]
score = table.col_values(1)[1:]
report = dict(zip(name, score))
i = 0
sum = 0
for name in sorted(report):
i += 1
eachscore = report[name]
sum = sum + eachscore
if "90" <= eachscore <= "100":
print u'第 %d 个学生是%s, 你的分数是 %s, 评分是 "A"' % (i, name, eachscore)
elif "80" <= eachscore <= "89":
print u'第 %d 个学生是%s, 你的分数是 %s, 评分是 "B"' % (i, name, eachscore)
elif "70" <= eachscore <= "79":
print u'第 %d 个学生是%s, 你的分数是 %s, 评分是 "C"' % (i, name, eachscore)
elif "60" <= eachscore <= "69":
print u'第 %d 个学生是%s, 你的分数是 %s, 评分是 "D"' % (i, name, eachscore)
else:
print u'第 %d 个学生是%s, 你的分数是 %s, 评分是 "E"' % (i, name, eachscore)
average = sum / i
print u"所有学生的平均分是: %.2f" % average
6.
# -*- coding:utf-8 -*-
import sys
filename1 = raw_input(u"请输入第一个待检查的文件名".encode('gbk'))[1:-1]
filename2 = raw_input(u"请输入第二个待检查的文件名".encode('gbk'))[1:-1]
fobj1 = open(filename1)
fobj2 = open(filename2)
file1 = fobj1.readlines()
file2 = fobj2.readlines()
dif_row = 0
for i in range(min(len(file1),len(file2))):
dif_row += 1
if file1[i] == file2[i]:
continue
else:
for j in range(min(len(file1[i]),len(file2[i]))):
if file1[i][j] == file2[i][j]:
continue
else:
dif_column = j + 1
break
else:
dif_column = min(len(file1[i]),len(file2[i])) + 1
break
else:
if len(file1) == len(file2):
print u"两个文件完全相同！"
sys.exit()
else:
dif_row = min(len(file1),len(file2)) + 1
dif_column = 1
print u"两个文件在第 %d 行、第 %d 列处不一样。" % (dif_row,dif_column)
7.未懂题意，存疑
8.
# -*- coding:utf-8 -*-
modulename = raw_input(u"请输入模块名字：".encode('gbk'))
try:
module = __import__(modulename)
except:
print u"输入的模块不存在！"
module_element = dir(module)
for eachelement in module_element:
print u"名字：", eachelement
print u"类型：", type(getattr(module, eachelement))
print u'值：', getattr(module, eachelement), '\n'
9-13 待补充
14.
# -*- coding:utf-8 -*- import sys import os def judge_int(num): if "." in num: return float(num) else: return int(num) def calculator(opera, num1, num2): num1 = judge_int(num1) num2 = judge_int(num2) if opera == "+": return num1 + num2 elif opera == "-": return num1 - num2 elif opera == "**" or opera == "^": return num1 ** num2 elif opera == "*": return num1 * num2 elif opera == "/": return num1 / num2 elif opera == "%": return num1 % num2 else: return u"无法识别，请正确输入" if len(sys.argv) == 4: script, calnum1, calopera, calnum2 = sys.argv result = calculator(calopera, calnum1, calnum2) print result memory_content = sys.argv[1:] + ['/n%d\n' % result] memory = open(r"E:\Code\CPP\9\test\9-14.txt",'a') memory.write(calnum1 + calopera + calnum2 + '\r\n') memory.write(str(result) + '\r\n') memory.close() else: if len(sys.argv) == 2: memory = open(r"E:\Code\CPP\9\test\9-14.txt", 'r+') print memory.read() memory.seek(0) memory.truncate() memory.close()
15.
# -*- coding:utf-8 -*-
import shutil
import sys
if len(sys.argv) == 3:
old = sys.argv[1]
new = sys.argv[2]
shutil.copyfile(lod, new)
sys.exit()
old = raw_input(u"请输入旧文件".encode('gbk'))[1:-1]
new = raw_input(u"请输入新文件名".encode('gbk'))[1:-1]
newfile = open(r'%s' % new, 'w')
newfile.close()
shutil.copyfile(r'%s' % old, r'%s' % new)
print u"完成！任意键退出！"
16.
# -*- coding:utf-8 -*-
filename = raw_input(u"请输入文件名字".encode('gbk'))[1:-1]
fobj = open(filename, 'r')
oldfile = fobj.readlines()
fobj.close()
newfile = []
for index, eachline in enumerate(oldfile):
if len(eachline) <= 80:
newfile.append(eachline)
else:
lastwordindex = eachline[:80].rindex(" ")
newfile.append(eachline[:lastwordindex])
oldfile.insert(index+1, eachline[lastwordindex+1:])
fobj = open(filename, 'w')
fobj.writelines(newfile)
fobj.close()
print u"完成，任意键退出！