pythonの文字列タイプ

 ：    
1   :        ,      ,    ,  

2     
name='egon' #name=str('egon')
x=str(1)
y=str(1.1)
z=str([1,2,3])
n=str({'a':1})      #str          ，      
print(type(x))
print(type(y))
print(type(z))
print(type(n))

3     +     
       (*****)：
1、     (   +   ) ：   
msg='hello world'
print(type(msg[5]))                   #   z       str
print(msg[-1])
msg[2]='A'                     #            

2、  (     ，  )
msg='hello world'
print(msg[1:5],type(msg[1:5]))
print(msg[6:-1])
print(msg[6:11])        #    worl        
print(msg[6:])
print(msg[6::2])

  (**)
print(msg[0:5])
print(msg[0:-1])
print(msg[6:-1:2])
print(msg[-3:-6:-2])
print(msg[0:])
print(msg[::-1])     #            ， 1            
msg='hello world'
print(msg[-3:-6:-1])
print(msg[6:9:-1])

3、  len
msg='hello world'
print(len(msg))         #len   msg   11 

4、    in not in
print('SB' in  'my name is alex,alex is SB')
print('alex' in  'my name is alex,alex is SB')
print('egon' not in  'my name is alex,alex is SB') #       egon            
print(not 'egon' in  'my name is alex,alex is SB')
print('n' in 'my name is alex,alec is sb')
print('n' not  in 'my name is sdsd,dffis ')

5、    strip
name='  e gon        '
print(name.strip(' '))     #      ，     。           
print(name.strip())

name='****A*e*gon****'
print(name.strip('*'))

name='****egon****'
print(name.strip('*'))
print(name.lstrip('*'))     #      *
print(name.rstrip('*'))      #      *

pwd=input('>>: ').strip() #pwd='123  '  ,      ，    
if pwd == '123':
    print('login successful')


msg='cccabcdefgccccc'
         'c'
print(msg.strip('c'))

print('*-=egon *&^'.strip('-= *&^'))   #          
print('-=egon*&'.strip('-=*&'))


6、  split
msg='egon:18:male:180:160'
l=msg.split(':')          #split   ：            
print(l)
print(l[3])

7、  
msg='hello world'
for x in msg:         # msg              for  
    print(x)

       (****)
1、strip,lstrip,rstrip
2、lower,upper
name='EoN'
print(name.lower())      #          

name='egonN'
print(name.upper())     #           


3、startswith,endswith
print('alex is SB'.startswith('alex'))     #      alex     
print('alex is SB'.endswith('B'))         #    B      


4、format     
print('my name is %s my age is %s' %('egon',18))
print('my name is {name} my age is {age}'.format(age=18,name='egon')) #          ,                

print('my name is {} my age is {}'.format('egon',18))   #      

print('my name is {0} my age is {1} {1} {1} {1}'.format('egon',18))  #             

5、split,rsplit
info='egon:18:male'
print(info.split(':')) #


print(info.split(':',1)) #['egon','18:male']                 
print(info.rsplit(':',1)) #['egon:18','male']            


6、join:                      
info='egon:18:male'
l=info.split(':')#     
print(l)
new_info='-'.join(l)#        -    
print(new_info)

num=['a','b','c']
print(':'.join(num)) #   'a:b:c'

num=[1,2,'c']
':'.join(num) #1+':'+2+':'+'c'                         

7、replace
msg='my name is wupeiqi,wupeiqi is SB'
print(msg.replace('wupeiqi','Pig',1))#         wupeiqi  pig，
print(msg)

8、isdigit
print('111.1'.isdigit())   #          ，False
print('1111'.isdigit()) #     ，   Ture

AGE=73
age=input('>>: ').strip() #age='asdfasdf'          
if age.isdigit(): #       
    age=int(age)#     
    if age > AGE:
        print('too big')
    elif age < AGE:
        print('too small')
    else:
        print('you got it')
else:
    print('         ')

    （    ）(**)
1、find,rfind,index,rindex,count
msg='my name is alex,alex is hahaha'
print(msg.find('alex'))
print(msg.find('SB')) #      -1

print(msg.index('alex'))
print(msg.index('SB')) #    index   

print(msg.find('alex',0,3))

print(msg.count('alex'))
print(msg.count('alex',0,15))

2、center,ljust,rjust,zfill
print('info egon'.center(50,'-'))
print('info egon'.ljust(50,'-'))
print('info egon'.rjust(50,'-'))
print('info egon'.zfill(50))

3、expandtabs
print('a\tb\tc'.expandtabs(1))

4、captalize,swapcase,title
print('my name is egon'.capitalize())
print('my Name Is egon'.swapcase())
print('my name is egon'.title())

5、is    
num1=b'4' #bytes
num2=u'4' #unicode,python3    u  unicode
num3=' ' #    
num4='Ⅳ' #    

isdigit():bytes,unicode
print(num1.isdigit())
print(num2.isdigit())
print(num3.isdigit())
print(num4.isdigit())

isdecimal():unicode
print(num2.isdecimal())
print(num3.isdecimal())
print(num4.isdecimal())

isnumberic;unicode,  ,  
print(num2.isnumeric())
print(num3.isnumeric())
print(num4.isnumeric())

6、is  
print('abasdf123123'.isalnum())
print('asdfasdf'.isalpha())
print('egon'.islower())
print('ABC'.isupper())

print('     '.isspace())
print('My Name Is Egon'.istitle())


 ：     
1     or    
          

2   or  
  

3   or   
   

name='egon'
print(id(name))
name='alex'
print(id(name))