1.
#使用while循环输出1 2 3 4 5 6 8 9 10
count=1
while count < 11:
if count == 7:
count+=1
continue
print(count)
count+=1
2.
#输出 1-100 内的所有奇数
for j in range(1,100):
if j%2==0:
continue
print(j)
3.
#输出 1-100 内的所有偶数
for i in range(1,51):
i+=i
print(i)
4.
#求1-2+3-4+5 ... 99的所有数的和
j = 1
o = 0
while j<=99:
if j%2==0:
o-=j
else:
o+=j
j+=1
print(o)
5.
#用户登陆（三次机会重试
n = 0
while n<3:
user=input('please enter your name:')
password=input('passwd:')
if user == 'buer' and password == '1234.com':
print('login successful!')
while True:
shu = input('>>>:')
if shu == 'quit':
n=3
break
else:
print('login fail')
n+=1
6.
#输入quit退出循环
while True:
sentence=input('请输入内容：')
if sentence == 'quit':
break
else:
print(sentence)
7.
#求1-100相加的和
sum = 0
for x in range(101):
sum+=x
print(sum)
8.
#输入名字
name = input('please your name:')
print('hello,',name)
9.
#求奇数和偶数的和
j = 0
o = 0
while j<=100:
if j%2==0:
o+=j
else:
o+=j
#print(j)
j+=2
print('偶数求和：',o)
j = 1
o = 0
while j<=100:
if j%2==0:
o-=j
else:
o+=j
#print(j)
j+=2
print('奇数求和：',o)
10.
#登录用户buer，密码123，进入用户输quit退出循环
tag=True
while tag:
name=input('please your name:')
pswd=input('please your password:')
if name == 'buer' and pswd == '123':
print('login successful!')
while tag:
cmd=input('==>>:')
if cmd == 'quit':
tag=False
continue
print(cmd)
11.
#乘法口诀表
for i in range(1,10):
for j in range(1,i+1):
print('%s*%s=%s' %(i,j,i*j),end=' ')
print()
12.
# 编写for循环，利用索引遍历出每一个字符
msg = 'hello egon 666'
for x in range(len(msg)):
print(msg[x], end=' ')
13.
# 编写while循环，利用索引遍历出每一个字符
msg = 'hello egon 666'
count = 0
while count < len(msg):
print(msg[count])
count += 1
14.
# msg='hello alex'中的alex替换成SB
msg='hello alex'
print(msg.replace('alex','SB'))
15.
# msg='/etc/a.txt|365|get'
将该字符的文件名，文件大小，操作方法切割出来
msg='/etc/a.txt|365|get'
print(msg.split('|'))
16.
# 编写while循环，要求用户输入命令，如果命令为空，则继续输入
while True:
user=input('请输入指令:')
if user=='':
continue
else:
break
17.
# 6.编写while循环，让用户输入用户名和密码，如果用户为空或者数字，则重新输入
while True:
name=input('please enter your name:')
passwd=input('please your password:')
if name=='' or name.isdigit(): #isdigit()字符串为整数
print('用户名不能为空或者数字')
continue
else:
break
18.
# 7.编写while循环，让用户输入内容，判断输入的内容以alex开头的，则将该字符串加上_SB结尾
while True: #第一种方法
con=input('请输入内容:')
aa='alex'
if con[:4]==aa[:4]: #[:4] 切片，从开头4位字符串切片
print(con,'_SB')
while True: #第二种方法
msg=input('请输入内容：')
if msg.startswith('alex'): #startswith() 以什么字符或字符串开头
print(msg,'_SB')
19.
# 8.1.两层while循环，外层的while循环，让用户输入用户名、密码、工作了几个月、每月的工资（整数），用户名或密码为空，或者工作的月数不为整数，或者
# 月工资不为整数，则重新输入
tag = True
while tag:
user = input('用户名:')
passwd = input('密码:')
work_mons = input('月份:')
salary = input('工资:')
if work_mons.isdigit() and salary.isdigit(): # isdigit()判断是否为整数
work_mons = int(work_mons)
salary = int(salary)
# if user=='' or passwd=='' or not isinstance(work_mons,int) or not isinstance(salary,int):
# print('格式错误')
if user != '' and passwd != '' and isinstance(work_mons, int) and isinstance(salary, int):
print('-------------------登录成功-----------------')
print('-------欢迎进入后台查询系统version:1.0-------')
print('----------------1.查询总工资----------------')
print('---------------2.查询用户身份---------------')
print('-----------------3.退出登录-----------------')
print()
print()
while tag:
cmd = input('===>>:')
if cmd == '1':
print('总工资:', work_mons * salary)
elif cmd == '2':
if user == 'alex':
print('super suer')
elif user == 'yuanhao' or user == 'wupeiqi':
print('normal user')
else:
print('unkown user')
elif cmd == '3':
tag = False
else:
print('输入错误')
else:
print('格式错误')
continue