Python Little Exercise

1.

#使用while循环输出1 2 3 4 5 6     8 9 10count=1while count < one:    if Count = = 7:        count+=1        continue    print (count )    Count+=1

2.

All odd for J in range (1,100) within #输出 1-100:    if j%2==0:        continue    print (j)

3.

All even for I in range (1,51) #输出 1-100:    i+=i    Print (i)

4.

#求1 -2+3-4+5 ... 99 of all numbers and j = 1o = 0while j<=99:    if j%2==0:        o-=j    Else:        o+=j    j+=1print (o)

5.

#用户登陆 (three chance retry n = 0while 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 (' Please enter content: ')    if sentence = = ' quit ': Break    Else:        print ( Sentence)

7.

#求1 100 Add sum = 0for x in range (101):    sum+=xprint (SUM)

8.

#输入名字name = input (' Please your Name: ') print (' Hello, ', name)

9.

#求奇数和偶数的和j = 0o = 0while j<=100:    if j%2==0:        o+=j    Else:        o+=j    #print (j)    J+=2print (' Even sum: ', O ) j = 1o = 0while j<=100:    if j%2==0:        o-=j    Else:        o+=j    #print (j)    j+=2print (' odd sum: ', O)

10.

#登录用户buer, password 123, enter the user input quit the Loop tag=truewhile 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):    to J in Range (1,i+1):        print ('%s*%s=%s '% (i,j,i*j), end= ')    print ()

12.

# Write A For loop, using an index to traverse out each character msg = ' Hello Egon 666 ' for X in range (len (msg)):    print (msg[x], end= ")

13.

# Write a while loop, using an index to traverse out every character msg = ' Hello Egon 666 ' Count = 0 while count < Len (msg):     print (Msg[count])     count + = 1

14.

# msg= ' Hello Alex ' in Alex replaced with SB msg= ' Hello Alex ' Print (Msg.replace (' Alex ', ' SB '))

15.

# msg= '/etc/a.txt|365|get ' to cut the character's file name, file size, operation method msg= '/etc/a.txt|365|get ' Print (Msg.split (' | '))

16.

# Write a while loop that requires the user to enter a command, and if the command is empty, continue to enter while True:     user=input (' Please enter directive: ')     if user== ':         continue     Else: Break         

17.

# 6. Write a while loop, let the user enter a user name and password, if the user is empty or number, re-enter while True:     name=input (' Please enter your name: ')     passwd=input (' Please your password: ')     if name== ' or Name.isdigit ():            #isdigit () string is an integer         print (' username cannot be empty or number ')         Continue     else:         break

18.

# 7. Write the while loop, let the user enter the content, and judge what the input begins with Alex, add the string _SB to the end while True: #第一种方法     con=input (' Please input: ')     aa= ' al Ex '     if Con[:4]==aa[:4]:               #[:4] Slice, from the beginning 4-bit string slice         print (con, ' _sb ') while True: #第二种方法     MSG=INP UT (' Please enter content: ')     if Msg.startswith (' Alex '):            #startswith () with what character or string starts with         print (msg, ' _SB ')

19.

# 8.1. Two-layer while loop, the outer while loop, let the user enter a user name, password, work for several months, the monthly salary (integer), the user name or password is empty, or the number of months of work is not an integer, or # Month salary is not an integer, then re-enter tag = truewhile tag: user = input (' User name: ') passwd = input (' Password: ') work_mons = input (' month: ') salary = input (' Payroll: ') if work_mons.isdigit () and Salary.isdigit (): # IsDigit () determines whether an integer work_mons = int (work_mons) salary = Int (salary) # if use r== "or passwd==" or not isinstance (work_mons,int) or not isinstance (salary,int): # print (' malformed ') if user! = ' ' and passwd! = ' and isinstance (work_mons, int) and isinstance (salary, int): print ('-------------------Login succeeded------        -----------') print ('-------Welcome to the background query system version:1.0-------') print ('----------------1. Query total Salary----------------') Print ('---------------2. Query user Identity---------------') print ('-----------------3. Sign out-----------------') pri NT () print () while tag:cmd = input (' ===>>: ') if cmd = = ' 1 ': prin T (' Total Salary: ', work_mons * salary) elif cmd = = ' 2 ': if user = = ' Alex ': Print (' Super suer ') elif user = = ' Yuanhao ' or user = = ' Wupeiqi ': print (' normal user ') Else:p    Rint (' unkown user ') elif cmd = = ' 3 ': Tag = False else:print (' input error ') Else:print (' format error ') continue

Python Little Exercise