Python核心编程-第六章-习题
有。in操作符；find()方法和count()方法和index()均能实现
import string import keyword alphas = string.letters + '_' nums = string.digits print "Welcome to the Identifier Checker v1.0" while True: myInput = raw_input("Identifier to test? ") if len(myInput) < 2: if myInput in alphas: print "Okay as an identifier" else: print '''invalid: first symbol must be alphabetic''' elif len(myInput) >= 2: if myInput in keyword.kwlist: print 'invalid: cannot be keywords!' elif myInput[0] not in alphas: print '''invalid: first symbol must be alphabetic''' else: for otherChar in myInput[1:]: if otherChar not in alphas + nums: print '''invalid: remaining symbol must be alphabetic''' break else: print "Okay as an identifier"
3.
a.
# -*- coding:utf-8 -*-
import random
print u"请根据提示输入数字"
num_list = []
for i in range(random.randrange(2,11)):
num = int(raw_input(u'请输入一个数字'.encode('gbk')).strip())
num_list.append(num)
i = 0
while i <= len(num_list) - 2:
for j in range(i,len(num_list)):
if num_list[i] < num_list[j]:
num_list[i], num_list[j] = num_list[j], num_list[i]
i += 1
print num_list
b.
# -*- coding:utf-8 -*-
import random
print u"请根据提示输入数字"
num_list = []
for i in range(random.randrange(2,11)):
num = int(raw_input(u'请输入一个数字'.encode('gbk')).strip())
num_list.append(num)
num_list.sort(reverse=True)
print num_list
4.
# -*- coding:utf-8 -*-
from __future__ import division
stu_num = int(raw_input(u"请输入学生个数：".encode('gbk')))
score = []
print u"请依次输入每个学生的分数，Q结束输入"
for i in range(stu_num):
try:
per_score = int(raw_input(u"请输入学生的得分".encode('gbk')))
score.append(per_score)
except ValueError:
break
for k, j in enumerate(score):
if 90 <= j <= 100:
print u'第 %d 个学生, 你的分数是 %d, 评分是 "A"' % (k+1, j)
elif 80 <= j <= 89:
print u'第 %d 个学生, 你的分数是 %d, 评分是 "B"' % (k+1, j)
elif 70 <= j <= 79:
print u'第 %d 个学生, 你的分数是 %d, 评分是 "C"' % (k+1, j)
elif 60 <= j <= 69:
print u'第 %d 个学生, 你的分数是 %d, 评分是 "D"' % (k+1, j)
else:
print u'第 %d 个学生, 你的分数是 %d, 评分是 "E"' % (k+1, j)
average = sum(score) / stu_num
print u"所有学生的平均分是: %.2f" % average
5.
a.
strings = raw_input("Please enter something:")
print strings[0], strings[1]
for i, j in enumerate(strings):
if 1 <= i <= len(strings) - 2:
print strings[i - 1], j, strings[i + 1]
print strings[-2], strings[-1]
b.
# -*- coding:utf-8 -*-
str1 = raw_input(u"请输入第一个字符串".encode('gbk'))
str2 = raw_input(u"请输入第一个字符串".encode('gbk'))
if len(str1) != len(str2):
print u"两个字符串不一致！！"
else:
for i in range(len(str1)):
if str1[i] != str2[i]:
print u"两个字符串不一致！！"
break
else:
print u"两个字符串完全一致！！"
c.
# -*- coding:utf-8 -*-
def if_palindrome(s):
if len(s) % 2:
print u'输入的字符串不是回文！'
else:
if s[:len(s)/2] == s[-1:len(s)/2-1:-1]:
print u"输入的字符串是回文！"
else:
print u"输入的字符串不是回文！"
a_string = raw_input(u"请输入一个字符串".encode('gbk'))
if_palindrome(a_string)
d.
# -*- coding:utf-8 -*-
def make_palindrome():
a_string = raw_input(u"请输入一个字符串： ".encode('gbk'))
print "BEFORE Palindrome: ", a_string
new_string = ''.join((a_string, a_string[::-1]))
print "AFTER Palindrome: ", new_string
make_palindrome()
6.
# -*- coding:utf-8 -*-
def str_strip(s):
s_strip = s
if s.startswith(' '):
i = 0
while i < len(s):
if not s[i].isspace():
s_strip = s[i:]
break
i = i + 1
if s_strip.endswith(' '):
j = -1
while j >= -len(s_strip):
if not s_strip[j].isspace():
s_strip = s_strip[:j+1]
break
j = j - 1
return s_strip
a_string = raw_input(u'请输入一个字符串：'.encode('gbk'))
print str_strip(a_string)
7.
#! /usr/bin/env python
# -*- coding:utf-8 -*-
# 接收用户输入一个数字
num_str = raw_input('Enter a number: ')
#把用户的输入转换成数字格式
num_num = int(num_str)
#生成一个从1到用户输入的数字的列表
fac_list = range(1, num_num+1)
print "BEFORE:", fac_list
#定义i
i = 0
#while循环实现删去能被用户输入的数字整除的项
while i < len(fac_list):
#检验是否能被整除
if num_num % fac_list[i] == 0:
del fac_list[i]
i -= 1
#对i自加1，检验下一项
i = i + 1
#打印出最终结果
print "AFTER:", fac_list
8.
a.
# -*- coding:utf-8 -*-
while True:
num_str = raw_input(u'请输入一个整数：'.encode('gbk'))
if num_str.isdigit():
break
else:
print u"请输入一个整数"
num_list = list(num_str)
eng_name_list = ['zero', 'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine']
for i, j in enumerate(num_list):
num_list[i] = eng_name_list[int(j)]
print '-'.join(num_list)
b.
# -*- coding:utf-8 -*-
while True:
num_str = raw_input(u'请输入一个整数：'.encode('gbk'))
if num_str.isdigit():
break
else:
print u"请输入一个整数"
unit_list = ['zero', 'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine']
ten_list = ['ten', 'eleven', 'twelve', 'thirteen', 'fourteen', 'fifteen', 'sixteen', 'seventeen', 'eighteen', 'nineteen']
decade_list = ['twenty', 'thirty', 'forty', 'fifty', 'sixty', 'seventy', 'eighty', 'ninety']
hun = 'hundred'
def single_figure(s):
return unit_list[int(s)]
def double_figures(s):
num_list = list(s)
num_num = int(s)
if num_num in range(10, 20):
return ten_list[num_num-10]
elif int(num_list[1]) == 0:
return ''.join(decade_list[int(num_list[0])-2])
else:
num_list[0] = decade_list[int(num_list[0])-2]
num_list[1] = unit_list[int(num_list[-1])]
return '-'.join(num_list)
def three_figures(s):
num_list = list(s)
num_num = int(s)
num_list[0] = ' '.join((unit_list[int(num_list[0])], hun, 'and'))
if int(num_list[1]) != 0:
num_list[1:] = [double_figures(s[1:])]
return ' '.join(num_list)
elif int(num_list[1]) == 0 and int(num_list[-1]) != 0:
num_list[1:] = single_figure(s[2])
return ' '.join(num_list)
else:
return ' '.join((unit_list[int(s[0])], hun))
if len(num_str) == 1:
print single_figure(num_str)
elif len(num_str) == 2:
print double_figures(num_str)
elif len(num_str) == 3:
print three_figures(num_str)
else:
print u"输入的数字必须在0-1000之间！"
9.
# -*- coding:utf-8 -*-
time = raw_input(u"请输入要转换的分钟数".encode('gbk'))
result = list(divmod(int(time), 60))
print u"%d分钟等于%d小时加%d分钟。" %(int(time), result[0], result[1])
10.
# -*- coding:utf-8 -*-
while True:
a_string = raw_input(u'请输入要转换的英文字符串,退出输入Q: '.encode('gbk'))
new_string = []
if a_string.lower() == 'q':
break
for i in a_string:
if i.islower():
new_string.append(i.upper())
elif i.isupper():
new_string.append(i.lower())
else:
new_string.append(i)
new_string = ''.join(new_string)
print u"转换前的字符串是：", a_string
print u"转换后的字符串是：", new_string
11.
a.
# -*- coding:utf-8 -*-
address = []
for i in range(4):
per_address = raw_input(u'请依次输入四段IP地址，每段地址是0-255之间的整数：'.encode('gbk'))
address.append(per_address)
print u'您输入的IP地址是：%s' % '.'.join(address)
b.
# -*- coding:utf-8 -*-
import sys
address = []
for i in range(4):
per_address = raw_input(u'请依次输入四段IP地址，每段地址是0-255之间的整数：'.encode('gbk'))
address.append(per_address)
print u'您输入的IP地址是：%s' % '.'.join(address)
next = raw_input(u"接下来将进行逆转换，继续请回车，否则请输入Q退出".encode('gbk'))
if next.lower() == 'q':
sys.exit()
num = ['一', '二', '三', '四']
for i in address:
print u'转换后的四段分是：%s' % i
12.
a.
# -*- coding:utf-8 -*- def findchr(string, char): if char not in string: return -1 else: i = 0 while i < len(string): if string[i] == char: return i break i += 1
b.
# -*- coding:utf-8 -*- def rfindchr(string, char): if char not in string: return -1 else: i = -1 while i >= -len(string): if string[i] == char: return i + len(string) break i -= 1
c.
# -*- coding:utf-8 -*- def subchr(string, origchar, newchar): if origchar not in string: return u"未找到！" else: i = 0 while i < len(string): if string[i] == origchar: return ''.join((string[:i], newchar, string[i+1:])) break i += 1
13.
# -*- coding:utf-8 -*-
def atoc(s):
error = 'ValueError: atoc() areg is a malformed string'
if '+' in s:
if s[-1] != 'j' or s.count('j') >= 2:
return error
else:
com = s.split('+')
real = float(com[0])
imag = float(com[1][:-1])
return complex(real, imag)
else:
if s.count('j') == 1:
real = 0
imag = float(s[:-1])
return complex(real, imag)
elif s.count('j') >= 2:
return error
else:
try:
real = float(s[:])
imag = 0
return complex(real, imag)
except ValueError:
return error
14.
# -*- coding:utf-8 -*- import random print u'欢迎来到石头剪刀布！' choice_list = [u'石头', u'剪刀', u'布'] result = [] for i in choice_list: for j in choice_list: result.append((i, j))
15.
a.
# -*- coding:utf-8 -*-
from datetime import datetime
print u'这是一个计算两个日期之间天数的小程序'
print u'日期的格式是MM/DD/YY'
while True:
date1 = raw_input(u'请输入第一个日期'.encode('gbk'))
date2 = raw_input(u'请输入第二个日期'.encode('gbk'))
date_format = '%m/%d/%Y'
date1 = datetime.strptime(date1, date_format)
date2 = datetime.strptime(date2, date_format)
#date1_mm, date1_dd, date1_yy = [int(i) for i in date1.split('/')]
#date2_mm, date2_dd, date2_yy = [int(i) for i in date2.split('/')]
delta = date2 - date1
print u'两个日期之间相差%d天！' % delta.days
b.
# -*- coding:utf-8 -*-
import datetime
import time
print u'这是一个计算出生至今共有多少天的小程序'
print u'输入的出生日期的格式是MM/DD/YY'
while True:
Birthday = raw_input(u'请输入您的出生日期'.encode('gbk'))
date_format = '%m/%d/%Y'
today = datetime.datetime.strptime(time.strftime('%m/%d/%Y'), date_format)
Birthday = datetime.datetime.strptime(Birthday, date_format)
delta = today - Birthday
print u'WOW！你出生已经%d天了！' % delta.days
c.
# -*- coding:utf-8 -*-
import datetime
import time
print u'这是一个计算下次生日距今天的天数的小程序'
print u'输入的出生日期的格式是MM/DD/YY'
while True:
Birthday = raw_input(u'请输入您的出生日期'.encode('gbk'))
date_format = '%m/%d/%Y'
today = datetime.datetime.strptime(time.strftime('%m/%d/%Y'), date_format)
Birthday = Birthday.split('/')
if '-'.join((Birthday[0], Birthday[1])) > datetime.datetime.now().strftime('%m-%d'):
Birthday[2] = datetime.datetime.now().strftime("%Y")
else:
Birthday[2] = str(int(datetime.datetime.now().strftime("%Y"))+1)
Birthday = '/'.join(Birthday)
Birthday = datetime.datetime.strptime(Birthday, date_format)
delta = Birthday - today
print u'WOW！你的下次生日距今还有%d天！' % delta.days
17.
# -*- coding:utf-8 -*- def myPop(Alist): to_pop = Alist[-1] del Alist[-1] return to_pop