python_day1作业

Posted 2020-09-22

1、使用while循环输出1 2 3 4 5 6     8 9 10  

1 count = 1
2 while count <=10:
3     if count != 7:
4         print(count)
5     count += 1

while 循环

1 for i in range(1,11):
2     if i != 7:
3         print(i)

for 循环

2、求1-100的所有数的和

1 sum = 0
2 count = 1
3 while count <= 100:
4     sum += count
5     count += 1
6 print(sum)

While 循环

1 sum = 0
2 for i in range(1,101):
3     sum += i
4 print(sum)

For 循环

3、输出 1-100 内的所有奇数

1 count = 1
2 while count <= 100:
3     if count % 2 == 1:
4         print(count)
5     count += 1

While 循环

1 for i in range(1,101):
2     if i % 2 == 1:
3         print(i)

For 循环

4、输出 1-100 内的所有偶数

1 count = 1
2 while count <= 100:
3     if count % 2 == 0:
4         print(count)
5     count += 1

While 循环

1 for i in range(1,101):
2     if i != 0 and  i % 2 == 0:
3         print(i)

For 循环

5、求1-2+3-4+5 ... 99的所有数的和

 1 count = 1
 2 sum = 0
 3 while count <= 99:
 4     if count % 2 == 1:
 5         sum += count
 6         count += 1
 7     else:
 8         sum -= count
 9         count += 1
10 print(sum)

While 循环

1 sum = 0
2 for i in range(1,100):
3     if i % 2 == 1:
4         sum += i
5     else:
6         sum -= i
7 print(sum)

for 循环

6、用户登陆（三次机会重试）

 1 count = 1
 2 name = ‘zzn‘
 3 passwd = 123
 4 while count <= 3:
 5     username = input(‘请输入用户名:‘)
 6     password = input(‘请输入密码:‘)
 7     password = int(password)
 8     if username == name and password == passwd:
 9         print(‘登陆成功!‘)
10         break
11     else:
12         print(‘用户名或密码错误!‘)
13         count += 1

while 循环

 1 count = 1
 2 name = ‘zzn‘
 3 passwd = 123
 4 while True:
 5     username = input(‘请输入用户名:‘)
 6     password = input(‘请输入密码:‘)
 7     password = int(password)
 8     if username == name and password == passwd:
 9         print(‘登陆成功!‘)
10         break
11     else:
12         print(‘用户名或密码错误!‘)
13         count += 1
14         if count == 4:
15             print(‘失败次数过多，已锁定!‘)
16             break

另一种While 三次失败 （加上提示，输入次数过多，已锁定 ）

 1 name = ‘zzn‘
 2 passwd = 123
 3 for i in range(1,4):
 4     username = input(‘请输入用户名:‘)
 5     password = input(‘请输入密码:‘)
 6     password = int(password)
 7     if username == name and password == passwd:
 8         print(‘登陆成功!‘)
 9         break
10     else:
11         print(‘用户名或密码错误!‘)

For 循环

 1 name = ‘zzn‘
 2 passwd = 123
 3 for i in range(1,4):
 4     username = input(‘请输入用户名:‘)
 5     password = input(‘请输入密码:‘)
 6     password = int(password)
 7     if username == name and password == passwd:
 8         print(‘登陆成功!‘)
 9         break
10     else:
11         print(‘用户名或密码错误!‘)
12         if i == 3:
13             print(‘失败次数过多，已锁定!‘)

另一种For 三次失败 （加上提示，输入次数过多，已锁定 ）