Python variables, character Exercise 1

1. determine whether a variable is legitimate: (a variable consists of a letter, a numeric underline; and the beginning is not a number)

While True:

s = raw_input ("Please input values:")

If s== "Exit":

Print "Welcome use nexttime!"

Break

If S[0].isalpha () or s[0] = = "_":

For i in S[1:]:

If not (I.isalnum () or I = = "_"):

Print "%s variable name is not valid!"%s

Break

Else

Print "%s variable name is valid!"%s

Second, input Word Reverse output (Xiaomi written test)

Sentenct = raw_input ("Please input sentenct:")

A = Sentenct.split ("")

Print "". Join (A[::-1])

Third, enter two strings to remove all characters from the second string (example: input: Hello World output: World Hello)

char1 = raw_input ("Please input first string:")
char2 = raw_input ("Please input second string:")
For i in CHAR1:
if I in Char2:
Continue
Else:
print "%s"% i,

Four, The user enters an integer number to find the factorial of the number

num = int (raw_ Input ("Enter integer:"))
rest = 1
Span style= "FONT-FAMILY:CALIBRI; Font-size:14pt ">for i in range (1, num + 1):
     Rest *= i
print " output%d factorial:%d " %  (num, rest)

Five, user Login, and no more than three times

For I in range (3):
username = raw_input ("Please input username:")
Password = raw_input ("Please input password:")
if username = = "root" and password = = "Westos":
print "Login success!!"
Break
Else:
print "Login error!!"
print "You have%d times changes"% (2-i)
Else:
print "More than three times! Try again after 10s "

Six, Determine the absence record of a student (no more than one a and no two consecutive L rewards)

While True:
record = Raw_input ("Please enter the student's absence record:")
print Record.count ("LLL") = = 0
if Record = = "Exit":
print "Exit ... "
Break
if (Record.count ("A") <= 1 and Record.count ("LLL") = = 0):
print "There are rewards!" "

Else:
Print "No Rewards!!" "

Seven, enter a line of characters, statistics how many words, every two words separated by empty reform
Line = raw_input ("Please input sentence:")
li = line.split ()
b = Len (LI)
print "There is%d words in the line"% (b)
Eight, the number of characters in the request list
char = raw_input ("Please input sentence:")
print len (char)

Nine, whether it is a palindrome number
num = raw_input ( "Please input values:")
Span style= "FONT-FAMILY:CALIBRI; Font-size:14pt ">if  (Num == num[::-1]):
& nbsp;   print  "is a palindrome number! "
else:
    print " is not a palindrome number "

Ten, beg greatest common divisor and least common multiple

min_num = min (num1, num2)
for I in range (1, Min_num + 1):
if (num1% i = = 0 and num2% i = = 0):
Gys = i
GBS = NUM1 * Num2/gys
print "%d and%d greatest common divisor:%d"% (NUM1, num2, Gys)
print "%d and%d Max public:%d"% (NUM1, num2, GBS)

Xi. guessing number games

Import Random
Systom = Random.randint (1, +)
Print Systom
num = 1
While (Num <= 5):
Guest = Int (raw_input ("Please enter the number you guessed (1-100):"))
if Guest < systom:
print "Too small!!"
elif Guest > Systom:
print "Too big!!"
Else:
print "congratulations!!"
Break
num + = 1

12. performing operations on a terminal

Import OS # can execute system commands
While True:
cmd = raw_input ("[[email protected] ~]$")
if cmd:
if cmd = = ' exit ':
print "Logout"
Break
Else:
#print ' run%s '%cmd
os.system (cmd)
Else:
Continue

Python variables, character Exercise 1