10. The syntax of the string str

1) The string of the slice and the index

s = 'ABCDLSESRF'
#index
 s1 = s[0]  
 print(s1)    #A
 s2 = s[2]
 print(s2)    #C
 s3 = p [-1]
 print(s3)    #F
 s4 = s [-2]
 print(s4)    #R
 #ABCD slice: care regardless tail
 s5 = s[0:4]   
 print(s5)    #ABCD
 s6 = s[0:-1]
 print(s6)    #ABCDLSESRF
 # S7 = s [:] s6 same
 # S8 = s [0:] Function
 print (S7, S8)
 s9 = s [0: 0] # indicates not error-free
s = 'ABCDLSESRF' # s [First: Last: step]
 s10 = s [0: 5: 2]
 print(s10)    #ACL
s11 = s[4:0:-1]
print(s11)    #LDCB
s12 = s[3::-1]
print(s12)    #DCBA
s13 = s[3::-2]
print(s13)    #DB
s = 'ABCDLSESRF'
s14 = s[-1::-1]
print(s14)    #FRSESLDCBA
s15 = s[::-1]
print(s15)    #FRSESLDCBA

2) Operation of the string

1. capitalized .capitalize ()

s = 'alexWUsir'
s1 = s.capitalize()
print(s1)

2. ALL CAPS .upper (), all lowercase .lower ()

s = 'alexWUsir'
s1 = s.upper()
s2 = s.lower
print(s1)
print(s2)

s_str= 'acEQ1'
you_input = input ( 'Enter the security code, case insensitive')
if s_str.upper() == you_input.upper():
    print ( 'Input success')
else:
    print ( 'Please re-enter')

3. Flip case .swapcase ()

s3 = s.swapcase ()
 print(s3)

4. Each separated (special characters or numbers) capitalized words .tittle ()

 s = 'alex*egon-wusir'
 s4 = s.title()
 print(s4)
 s = 'fade,crazy*w4rri0r_songsong node_3'
 s4 = s.title()
 print(s4)

The center, a blank is filled .center ()

 s = 'alexWUsir'
 s5 = s.center(20,'~')
 print(s5)

6. Remove / t replaced with spaces .expandtabs ()

s = 'alex \ survivors'
s6 = s.expandtabs()
 print(s6)

7. .len string length ()

s = 'alex \ survivors'
l = len (s)
print(l)

8. begins with what .starwish, to what end .endwish

s = 'alexWUsir'
s7 =s.startswith('alex')
s71 = s.startswith('e',2,5)
print (s71, s7)

9. By looking element index .find () .index

find find indexed by elements not found -1

index looking index by elements not found error

s = 'alexWUsir'
s8 = s.find('A')
s81 = s.index('A')
print(s81s8)

10. Remove the space before and after the default .strip () .lstrip from left to right to delete delete .rstrip

s = 'alexWUsir%'
s9 = s.strip('%')
print (s9)
s = ' *a%lexWUsi* r%'
s91 = s.strip(' %*')
print(s91)

11. .count find out the number of an element of character ()

s = 'alexaa wusirl'
s10 = s.count('al')
print(s10)

12. A cutting string list .split ()

s = ';alex;wusir;taibai'
l = s.split('a')
print(l)

13. .format output format ()

Three kinds of games are played formatted output #format
s = 'My name is {}, {year}, {} hobby, to tell you my name is {}'. format ( 'Bai', 36, 'girl', 'Bai')
print(s)
name = input ( 'Please enter the name:')
s = 'My name is {0}, {1} this year, hobbies, {2}, to tell you my name is {0}'. format (name, 36, 'girl')
print(s)
name = input ( 'Please enter the name:')
s = 'My name is {name}, this {age}, hobby {hobby}, to tell you my name is {name}'. format (age = 18, name = name, hobby = 'girl')
print(s)

14. Alternatively .replace string elements ()

s = 'to look at neighbors complex master good neighborhood law sprinkled see clients'
s11 = s.replace ( 'neighborhood', 'Wang', 1)
print(s11)