python3的一些练习题
下面是最近写的一些python3版本的一些练习题：
1、4+44+444+4444+.....+=？
root@wadeson:~/study_for_python/homework# cat aa.py #!/usr/bin/python3 n = int(input("please input a number: ")) init_num = int(input("pleasr input a init number: ")) total = 0 num1 = 0 for i in range(n): num1 = num1 + (10**i)*init_num total = total + num1 print(total)
运行结果：
root@wadeson:~/study_for_python/homework# python3 aa.py please input a number: 3 pleasr input a init number: 4 492
2、九九乘法表：
root@wadeson:~/study_for_python/circle# cat while_about_nine2.py #!/usr/bin/python3 num1 = 1 while num1 <= 9: num2 = 1 while num2 <= 10 - num1: # num2从9开始依次减小 print("%d * %d = %d" % (num2,num1,num1*num2), end=" ") # num2总是从1开始循环，并且循环到num1的值，end=" "表示不换行，空格间隔 num2 = num2 + 1 print() # 作用是换行 num1 = num1 + 1
运行如下：
root@wadeson:~/study_for_python/circle# python3 while_about_nine2.py 1 * 1 = 1 2 * 1 = 2 3 * 1 = 3 4 * 1 = 4 5 * 1 = 5 6 * 1 = 6 7 * 1 = 7 8 * 1 = 8 9 * 1 = 9 1 * 2 = 2 2 * 2 = 4 3 * 2 = 6 4 * 2 = 8 5 * 2 = 10 6 * 2 = 12 7 * 2 = 14 8 * 2 = 16 1 * 3 = 3 2 * 3 = 6 3 * 3 = 9 4 * 3 = 12 5 * 3 = 15 6 * 3 = 18 7 * 3 = 21 1 * 4 = 4 2 * 4 = 8 3 * 4 = 12 4 * 4 = 16 5 * 4 = 20 6 * 4 = 24 1 * 5 = 5 2 * 5 = 10 3 * 5 = 15 4 * 5 = 20 5 * 5 = 25 1 * 6 = 6 2 * 6 = 12 3 * 6 = 18 4 * 6 = 24 1 * 7 = 7 2 * 7 = 14 3 * 7 = 21 1 * 8 = 8 2 * 8 = 16 1 * 9 = 9
或者如下：
root@wadeson:~/study_for_python/circle# cat while_about_nine.py #!/usr/bin/python3 num1 = 1 while num1<=9: num2 = 1 while num2 <= num1: # num2依次从1开始增大到9 print("%d * %d = %d" % (num2,num1,num1*num2), end=" ") num2 = num2 + 1 print() num1 = num1 + 1
root@wadeson:~/study_for_python/circle# python3 while_about_nine.py 1 * 1 = 1 1 * 2 = 2 2 * 2 = 4 1 * 3 = 3 2 * 3 = 6 3 * 3 = 9 1 * 4 = 4 2 * 4 = 8 3 * 4 = 12 4 * 4 = 16 1 * 5 = 5 2 * 5 = 10 3 * 5 = 15 4 * 5 = 20 5 * 5 = 25 1 * 6 = 6 2 * 6 = 12 3 * 6 = 18 4 * 6 = 24 5 * 6 = 30 6 * 6 = 36 1 * 7 = 7 2 * 7 = 14 3 * 7 = 21 4 * 7 = 28 5 * 7 = 35 6 * 7 = 42 7 * 7 = 49 1 * 8 = 8 2 * 8 = 16 3 * 8 = 24 4 * 8 = 32 5 * 8 = 40 6 * 8 = 48 7 * 8 = 56 8 * 8 = 64 1 * 9 = 9 2 * 9 = 18 3 * 9 = 27 4 * 9 = 36 5 * 9 = 45 6 * 9 = 54 7 * 9 = 63 8 * 9 = 72 9 * 9 = 81
3、打印*符号：
root@wadeson:~/study_for_python/circle# cat while_2.py #!/usr/bin/python3 line = 4 num = line while line > 0: num1 = 0 while num1 <= num - line: print("*", end="") num1 = num1 + 1 print("") line = line - 1
运行结果如下：
root@wadeson:~/study_for_python/circle# python3 while_2.py * ** *** ****
root@wadeson:~/study_for_python/circle# cat while_1.py #!/usr/bin/python3 num = 1 line = 4 while num <= line: num1 = 0 while num1 <= line - num: print("*", end="") num1 = num1 + 1 print("") num = num + 1
root@wadeson:~/study_for_python/circle# python3 while_1.py **** *** ** *
4、验证账户信息，如果是锁住的账户，则直接登录失败；如果没有注册的账户，请先进行注册；如果输入账号密码错误三次则锁住该账户；如果登录成功，则打印成功信息
root@wadeson:~/study_for_python/homework# cat authenticate_user_land.py #!/usr/bin/python3 import getpass user_list = {} lock_user = [] # 读取文件中的的账号和密码保存在用户字典中 with open("user_list.txt","r") as f1: for i in f1.readlines(): (user,passwd) = i.strip().split() user_list[user] = passwd # 读取锁用户文件中的user保存在列表中 with open("lock_user.txt","r") as f2: for i in f2.readlines(): user = i.strip() lock_user.append(user) user_get=input("please input user:") passwd_get=getpass.getpass("please input password:") T = 0 while T < 2: # 当输入的名字存在于锁用户中时，直接退出 if user_get in lock_user: print("your user %s has been locked,please contact administrator" % user_get) break # 当输入的用户不存在锁用户中：1，账号密码进行判断三次 2，账号不存在 else: if user_get not in user_list.keys(): print("user %s is not exist,please register!" % user_get) break else: if passwd_get == user_list[user_get]: print("welcome to %s" % user_get) break else: print("your password is wrong,please try again") T = T + 1 user_get=input("please input user:") passwd_get=getpass.getpass("please input password:") else: print("your user %s has been locked!" % user_get) lock_user.append(user_get) with open("lock_user.txt","w") as f_lock: for i in lock_user: f_lock.write("%s\n" % i)
root@wadeson:~/study_for_python/homework# cat lock_user.txt user1 wadeson
root@wadeson:~/study_for_python/homework# cat user_list.txt wadeson redhat jsonhc redhat
root@wadeson:~/study_for_python/homework# python3 authenticate_user_land.py please input user:wadeson please input password: your user wadeson has been locked,please contact administrator
L1 = [1, 2, 3, 4, 5]
L2 = ["a", "b", "c", "d", "e"]
L = ['1a', '2b', '3c', '4d', '5e']
L1 = [1, 2, 3, 4, 5]
L2 = ["a", "b", "c", "d", "e"]
L = []
i = 0
j = 0
while i < len(L1):
while j < len(L2):
t = "%s%s" % (L1[i], L2[j])
L.append(t)
j = j + 1
i = i + 1
print(L)
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