python String (String)

'' 'What is the string 
an arbitrary text string is a single or double quotes 
' ABC ' 
"DEF" 
string immutable 
' '' 

# create a string 
str1 = "sunck IS A Good man!" 
Str3 = "Nice sunck IS A man!" 
str5 = "sunck IS A Handsome man!" 

'' ' 
string operations 
' '' 
# string concatenation 
STR6 = "sunck IS A" 
STR7 = "Good man" 
Str8 + = STR6 STR7 
Print ( "STR6 =", STR6) 
Print ( "STR7 =", STR7) 
Print ( "Str8 =", Str8) 
# repeated string output 
STR9 = "Good" 
str10 = STR9. 3 * 
Print ( "str10 =",str10) 
# access the string of a single character 
# to locate the character indexed by the subscript, the index starts at 0 
# string name [subscript] 
STr11 = "sunck IS A Good man! Kay" 
Print (STr11 [1]) 
# str11 [1] = "a" # string immutable
Print ( "STr11 =", STr11) 

# string taken part 
str13 = "sunck IS A Good man!" 
# taken from the start to set a mark to set a standard prior 
str15 str13 = [6:15] 
# taken prior to re-set standard 
str16 str13 = [:. 5] 
# to set the scale taken at the beginning to the end 
str17 = str13 [16:] 
Print ( "str17 =", str17) 

str18 = "A Good man IS sunck " 
Print (" Good "in str18) 
Print (" good1 "Not in str18) 

#Print (~. 5) #. 6 
'' ' 
00000101 
11.11101 million 
10000110 
' '' 

# formatted output 
Print (" A Good man SUNC IS ") 
NUM 10 = 
str19 = "Nice sunck IS A man!" 
F = 10.1267 
Print ( "NUM =", NUM, "str19 =",str19) 
#% F% S% D placeholder 
# 3 decimal place, are rounded
Print ( "NUM =% D, str19 =% S, F% = .3f"% (NUM, str19, F)) 

'' ' 
escape character \ 
convert some of the characters into characters have special meaning 
' '' 
# \ n- 
Print ( "NUM =% D \ nstr19 =% S \ =% NF .3f"% (NUM, str19, F)) 
'' ' 
\\ 
' '' 
Print ( "\\ sunck IS") 

# \ '\ " 
Print ( 'Tom IS A \' Good \ 'man') 
Print (" Tom IS A \ "Good \" man ") 
# Tom IS A 'Good' man 

# If a lot of wrapping the strings, with \ n write reading in a row not 
Print ( "good \ nnice \ nhandsome") 
Print ( '' ' 
good 
Nice 
Handsome 
' '') 

'' ' 
\ tab T 
' ''
Print ( "sunck \ tgood") 


# If there is a lot of character strings need to escape, it is necessary to add a lot of \, for simplicity, Python allows r represents the inside of the default character string is not escape 
# \\\ t \\ 
print (r "\\\ t \\" )
Print (R & lt "C: \ the Users \ XLG \ Desktop \ the Python-1704 \ day03") 
Print ( "C: \\ \\ Desktop XLG the Users \\ \\ \\ day03 the Python-1704") 
'' ' 
Windows 
  C: XLG the Users \\ \\ Desktop \\ \\ \\ day03 the Python-1704 
Linux 
  / the root / User / sunck / Desktop / the Python-1704 / day03 
'' ' 


#eval (str) 
# function: as an effective string str expression is evaluated and computed results back 
num1 = the eval ( "123") 
Print (num1) 
Print (type (num1)) 
Print (the eval ( "123 +")) 
Print (the eval ( "- 123")) 
Print ( the eval ( "12 is +. 3")) 
Print (the eval ( "12-3")) 
#Print (the eval ( "A123")) 
#Print (the eval ( "12a3")) 


#len (STR) 
# returns a string length (number of characters) 
Print (len ( "Good sunck IS A man Kai")) 

#Lower () converts a string uppercase to lowercase 
str20 = "SUNCK is a Good Man ! Kai"
= str20.lower str21 () 
Print (str21) 
Print ( "% S STR20 ="% (STR20)) 

#upper () converts the string of small letters to capital letters 
str21 = "A Good Man SUNCK IS!" 
Print (str21 .upper ()) 


#swapcase () converts the string to uppercase letters lowercase letters, uppercase letters to lowercase letters 
str22 = "SUNCK iS A GOOD mAn!" 
Print (str22.swapcase ()) 


#capitalize () first letter capitalized, other lowercase 
str23 = "SUNCK iS a GOOD mAn!" 
Print (str23.capitalize ()) 


initials #title () every single uppercase 
str24 = "SUNCK iS a GOOD mAn!" 
Print (str24.title ()) 

# char Character 
#center (width [, FillChar]) 
# returns a string that specifies the width of the center, as a string filled FillChar default spaces filled 
str25 = "Nice kaige iS a man" 
Print (str25.center (40, "* ")) 


#ljust (width [,FillChar]) 
# Returns a string that specifies the width of the left-justified, fllchar to fill characters, a space filled with a default
= str26 "Nice kaige IS A man" 
Print (str26.ljust (40, "%")) 



#rjust (width [, FillChar]) 
# Returns a string that specifies the width of the right-aligned, fllchar to fill characters, a space filled with a default 
= str27 "Nice kaige iS a man" 
Print (str26.rjust (40, "%")) 


#zfill (width) 
# returns a string of length to width, the original string right alignment, front fill 0 
str28 = "kaige a Nice man iS " 
Print (str28.zfill (40)) 

#COUNT (STR [, Start] [, End]) 
# returns the number of times a string appears strc, a range can be specified, the default start to finish 
str29 =" kaige A Very Very Nice man IS " 
Print (str29.count (" Very ", 15, len (str29))) 


#find (str [, Start] [, End]) 
# from left to right is included in the character string detection str the string, the specified range, the default start to finish. Obtained is the first time the start index, without return -1 
str30 = "A Very Very Nice kaige IS man" 
Print (str30.find ( "Very"

Print (str30.find ( "Very", 15, len (str30))) 


#rfind (STR [, Start] [, End])] 
str30 = "A Very Very Nice kaige IS man" 
Print (str30.rfind ( " Very ")) 
#Print (str30.rfind (" Good ")) 
Print (str30.rfind (" Very ", 0, 15)) 

#index (STR, Start = 0, End = len (STR)) 
# find root () the same, but if there is no time to return str an exception 
str31 = "kaige iS a Very Very Nice man" 
#Print (str31.index ( "Good")) 


#rindex (str, Start = 0, End = len (str)) 
# root rfind () the same, but if there is no time to return str an exception 
str32 = "kaige iS a Very Very Nice man" 
Print (str32.rindex ( "Very")) 


#lstrip () amputated the left side of the character string specified, the default is a space 
str33 = "******* kaige iS a Nice man" 
Print (str33.lstrip ( "*")) 

#Rstrip () truncated right specified character string, the default is a space 
str34 = "kaige is a nice man "
print(str34.rstrip(), "*")

str35 = "*******kaige is a nice man*********"
print(str35.strip("*"))


str36 = "a"
print(ord(str36))
str37 = chr(65)
print(str37)

print(" " != " ")