3. string functions to achieve

# ################## 1. Upper / lower usage simple ################### 
'' ' 
value = 'Alex SB' 
Print (value) 

value = 'Alex SB' 
NEW_VALUE = value.upper () 
Print (NEW_VALUE) 
'' ' 
' '' does not change the value of the value, will generate a new value 
must be newly generated later the value assigned to accepting a new variable '' ' 


' '' 
value = 'Alex SB' 
NEW_VALUE = value.lower () 
Print (NEW_VALUE) 
'' ' 


# ###### exemplary codes 
# cumbersome EDITION 
' '' 
= check_code 'iyUF' 
Message = 'Please enter PIN% s:'% (check_code, ) # formatting character 
code = iNPUT (Message) 
new_check_code = check_code.lower () 
new_code = code.lower () 
IF new_check_code == new_code :
    print ( 'successful landing!') 
'' ' 

# simple version of 
' ''
= check_code 'iyUF' 
code = INPUT ( "Please enter the verification code S%: '% (check_code,)) 
IF code.lower () == check_code.lower (): # direct comparison 
    print (' successful login! ') 
'' ' 

# ################## 2.isdigit simple use ################### 

Print (' ' 'Please call 10086 
1. Charge services 
2. traffic service 
3. broadband' '') 
-service = iNPUT ( 'select service:') 
Judge = service.isdigit () 
# determines whether the user input string can be converted to digital. # '666' 'Chi Master' 
Print (Judge) # Boolean value 
IF Judge: 
    -Service = int (-Service) 
    Print (-Service) 
the else: 
    Print ( "Enter a number") 



# ########### . ####### removing the blank 3 Strip / the lstrip / ################# The rstrip 
'' '= user iNPUT (' enter username: ') #'

new_user2 = user.lstrip () # remove spaces left 
new_user3 = user.strip () # remove clear space Note: You can not delete an intermediate portion 
Print ( '->', User, '<-') 
Print (new_user1) 
Print ( new_user2) 
Print (new_user3) 
'' ' 

# ##############. 4. Alternatively ##################### replace 
' '' 
the Message = the INPUT ( 'please speak:') 
Print (the Message) # I went to your uncle home to play 
content = message.replace ( 'your uncle', '***') # your uncle will be replaced by '*** ' 
Content = message.replace (' your uncle ',' *** ', 1) # From left to right number, you need to replace several 
Print (Content) 
' '' 


# ########### ### 5 cutting Split / rsplit ##################### 
'' ' 
the Message =' Zhang is now forced to look ignorant, because he had slept well, over and over again. ' 
Incision message.split = (', ' ) # Cut in accordance with a comma. 
incision1 = message.split ( ',', 1) # number from left to right to locate the first comma cutting.
incision2 = message.rsplit ( ',') # right to left, cut in accordance with a comma. 
incision3 = message.rsplit ( ',', 1) # right to left, the first to find a comma cutting. 

Print (incision) 
Print (incision1) 
Print (incision2) 
Print (incision3) 

# Note: Returns the value list after dividing 
'' '