target = 425
guess = 0
cishu = 0
while guess != target:
guess = eval(input('请输入一个猜测的整数（1至1000）：'))
if guess > target:
print('猜大了')
cishu = cishu + 1
print("已猜测的次数为{}".format(cishu))
elif guess < target:
print('猜小了')
cishu = cishu + 1
print("已猜测的次数为{}".format(cishu))
else:
print('猜对了')
print("猜测的总次数为{}".format(cishu))

习题4.2
zhifuchuan = input("请输入你想要的字符串：")
kong = 0
num = 0
zhongwen = 0
yingwen = 0
qita = 0
for i in zhifuchuan:
if i == " ":
kong += 1
elif '0'<= i <= '9':
num += 1
elif i >= u'\u4e00' and i <= u'\u9fa5':
zhongwen += 1
elif True == i.isalpha():
yingwen += 1
else:
qita += 1
print("输入的字符串中有{}个空格，{}个数字，{}个中文，{}个英文字符，{}个其他字符".format(kong,num,zhongwen,yingwen,qita))

习题4.3
a,b = eval(input("请输入两个整数，中间用，隔开："))
c= a*b
if a<b:
a,b=b,a
while False == (a in [0,1]):
b,a=a,b%a
c=c/b
print("最小公约数为：{}，最大公倍数为：{}".format(b,c))

习题4.4

GuessANum.py
import random
num = random.randint(0,1000)
guess = 0
cishu = 0
while guess != num:
guess = eval(input('请输入一个猜测的整数（1至1000）：'))
if guess > num:
print('猜大了')
cishu = cishu + 1
print("已猜测的次数为{}".format(cishu))
elif guess < num:
print('猜小了')
cishu = cishu + 1
print("已猜测的次数为{}".format(cishu))
else:
print('猜对了')
print("猜测的总次数为{}".format(cishu))

习题4.5

GuessANum.py
import random
num = random.randint(0,1000)
cishu = 0
while 1:
try:
guess = eval(input('请输入一个猜测的整数（1至1000）：'))
if guess > num:
print('猜大了')
cishu = cishu + 1
print("已猜测的次数为{}".format(cishu))
elif guess < num:
print('猜小了')
cishu = cishu + 1
print("已猜测的次数为{}".format(cishu))
elif guess == num:
print('猜对了')
print("猜测的总次数为{}".format(cishu))
break

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