3.5. 尝试实现一个管理系统
=======通讯录管理系统=======
1.增加姓名和手机
2.删除姓名
3.修改手机
4.查询所有用户
5.根据姓名查找手机号
6.退出
============================
#3.5 l = [] d = dict() s = '通讯录管理系统' print('{:=^21}'.format(s)) s = '1.增加姓名和手机' print(s) s = '2.删除姓名' print(s) s = '3.修改手机' print(s) s = '4.查询所有用户' print(s) s = '5.根据姓名查找手机号' print(s) s = '6.退出' print(s) s = '=' print(s*30) while True: n = int(input('请输入数字进行操作:')) if n == 1: k = input('请输入姓名:') v = input('请输入手机号:') d[k]= v print() elif n == 2: k = input('请输入所删姓名:') for i in d: if k == i: d.pop(k) break else: print('姓名不存在') print() elif n == 3: k = input('请输入要修改的姓名:') for i in d: if k == i: v = input('请输入要修改的手机号:') d[k]= v break else: print('姓名不存在') print() 1,1 顶端
4.5. 随机产生密码:
在26个大小写字母和10个数字组成的列表中,随机生成10个8位密码
#4.5 l = [] for i in range(10): l += [i] for i in range(26): l += chr(ord('a') + i) for i in range(26): l += chr(ord('A') + i) #print(l) import random l2 = [] for i in range(10): l1 = [] for j in range(8): l1 += [l[random.randrange(0,10+26+26)]] if j == 7: l2 += [l1] print(l2)
5.1.通过代码实现如下转换:
• 二进制转换成十进制:v = “0b1111011”
• 十进制转换成二进制:v = 18
• 八进制转换成十进制:v = “011”
• 十进制转换成八进制:v = 30
• 十六进制转换成十进制:v = “0x12”
• 十进制转换成十六进制:v = 87
#5.1 v = '0b1111011' print(int(v,2)) v = '18' print(bin(int(v,10))) v = '011' print(int(v,8)) v = '30' print(oct(int(v,10))) v = '0x12' print(int(v,16)) v = '87' print(hex(int(v,10)))
5.3.求结果
v1 = 1 or 3
v2 = 1 and 3
v3 = 0 and 2 and 1
v4 = 0 and 2 or 1
v5 = 0 and 2 or 1 or 4
v6 = 0 or Flase and 1
v1 = 1 v2 = 3 v3 = 0 v4 = 1 v5 = 1 v6 = False
5.7.求结果: a. [ i % 2 for i in range(10) ] b. ( i % 2 for i in range(10) )
a = [0,1,0,1,0,1,0,1,0,1]
b = <generator object <genexpr> at 0x7f5d13479e08>
5.8.求结果: a. 1 or 2 b. 1 and 2 c. 1 < (2==2) d. 1 < 2 == 2
#5.8 a = 1 b = 2 c = False d = True
1.请写出与 10 < cost < 50 等价的表达式
a = ('cost > 10 and coat < 50')
2.Python3 中,一行可以书写多个语句吗?
Python3 中,一个语句可以分成多行书写吗?
a = ('可以,用;隔开即可') b = ('可以,用\即可换行')
3.我们人类思维是习惯于“四舍五入”法,你有什么办法使得 int() 按照“四舍五入”的方式取整吗?
s = float(input(':')) s1= int(s + 0.5) print(s1)
4.请用最快速度说出答案:not 1 or 0 and 1 or 3 and 4 or 5 and 6 or7 and 8 and 9
a = 4
5.爱因斯坦曾出过这样一道有趣的数学题:有一个长阶梯,若每步上2阶,最后剩1阶;若每步上3阶,最后剩2阶;若每步上5阶,最后剩4阶;若每步上6阶,最后剩5阶;只有每步上7阶,最后刚好一阶也不剩。请编程求解该阶梯至少有多少阶?
i = 0 while True: if i % 2 == 1 and i % 3 == 2 and i % 5 == 4 and i % 6 == 5 and i % 7 == 0: print(i) break i += 1
6.假设有 x = 1,y = 2,z = 3,请问如何快速将三个变量的值互相交换?
x = 1 y = 2 z = 3 n = x x = y y = z z = n
7.目测以下程序会打印什么?
while True:
while True:
break
print(1)
print(2)
break
else:
print(3)
a = 2
8.member.append(['竹林小溪', 'Crazy迷恋']) 和member.extend(['竹林小溪', 'Crazy迷恋']) 实现的效果一样吗?
a = ('不同,s.append(x)相当于s[len(s):len(s)] = [x],\ 把['竹林小溪', 'Crazy迷恋']当作一个元素加入;s.exte\ nd(t)相当于s[len(s):len(s)] = t,把['竹林小溪', 'Cr\ azy迷恋']里的2个字符串当作两个元素加入')
9.请问如何将下边这个列表的'小笨蛋'修改为'小坏蛋'?
list1 = [1, [1, 2,['小笨蛋']],3, 5, 8, 13, 18]
list1 = [1, [1, 2,['小笨蛋']],3, 5, 8, 13, 18] list1[1][2][0] = '小坏蛋' print(list1)
10.要对一个列表进行顺序排序,请问使用什么方法?
a = ('用.sort()函数')
11.要对一个列表进行逆序排序,请问使用什么方法?
a = ('用.reverse()函数')
12.什么情况下你需要使用元组而不是列表?
当元组和列表掉下水,你会救谁?
a = ('不用改变序列时,救列表,元组添不进水,不会淹死')
13.x, y, z = 1, 2, 3 请问x, y, z是元组吗
a = ('不是,这只是对x,y,z分别赋值')
14.编写一个进制转换程序(提示,十进制转换二进制可以用bin()这个BIF):
s = input('请输入数字:') a,b = eval(input('请输入a,b(a进制转b进制):')) f = 0 if a == 2: if b == 8: s1 = oct(int(s,2)) elif b == 10: s1 = int(s,2) elif b == 16: s1 = hex(int(s,2)) else: print('错误') f = 1 elif a == 8: if b == 2: s1 = bin(int(s,8)) elif b == 10: s1 = int(s,8) elif b == 16: s1 = hex(int(s,8)) else: print('错误') f = 1 elif a == 10: if b == 2: s1 = bin(int(s,10)) elif b == 8: s1 = oct(int(s,10)) elif b == 16: s1 = hex(int(s,10)) else: print('错误') f = 1 elif a == 16: if b == 2: s1 = bin(int(s,16)) elif b == 8: s1 = oct(int(s,16)) elif b == 10: s1 = int(s,16) else: print('错误') f = 1 else: print('错误') f = 1 if f == 0: print(s1)
15.我们根据列表、元祖和字符串的共同特点,把它们三统称为什么?有什么共性
a = ('统称为序列类型,是基本序列类型')
16.请问这个函数有多少个参数?
def MyFun((x,y), (a, b)):
return x * y - a * b
17.编写一个函数满足以下功能:
计算打印所有参数的和乘以基数(base=3)的结果
18.猜字游戏,随机产生10以内的整型数,可供用户猜,如果猜对,打印“厉害了!500万属于你”,如果猜错,如果比随机数大,提示,“大了,再给你一次机会”,如果比随机数小,提示“大胆一点”。用户最多有三次机会
#6.18 import random n = random.randint(0,10) for i in range(3): m = int(input('请猜数字0~10:')) if m == n: print('厉害了!500万属于你') break elif m > n: if i == 2: break print('大了,再给你一次机会') elif m < n: if i == 2: break print('大胆一点')
19.盒子里有3个红球,3个蓝色球,4个黄球,现刘柱要从盒子里拿出8个球,问有多少种情况
l = [] for i in range(4): for j in range(4): for k in range(5): if i + j + k == 8: l += [[i,j,k]] print(l) n = len(l) print(n)
20.打印9 9乘法表
for i in range(1,10): for j in range(1,10): if i < j: print() break print('{:2}*{:2}= {:2}'.format(i,j,i*j),end=' ') print()
21.猴子得到一堆桃,当天吃了一半之后,又多吃了1个。以后每天,猴子都吃了剩余的一半桃子之后,又多吃一个。在第10天,只剩下1个桃子。输出这堆桃最初有多少个。
i = 0 while True: i += 1 n = i f = 0 for j in range(9): if i % 2 != 0: f = 1 break i = (i / 2) - 1 if f == 0 and i == 1: print(n) break i = n