1, to the space and special symbols
Copy Code code as follows:
S.strip (). Lstrip (). Rstrip (', ')
2. Copy String
Copy Code code as follows:
#strcpy (SSTR1,SSTR2)
SSTR1 = ' strcpy '
SSTR2 = SStr1
SSTR1 = ' Strcpy2 '
Print SSTR2
3. Connection string
Copy Code code as follows:
#strcat (SSTR1,SSTR2)
SSTR1 = ' strcat '
SSTR2 = ' Append '
SSTR1 + + SSTR2
Print SSTR1
4. Find characters
Copy Code code as follows:
#strchr (SSTR1,SSTR2)
# < 0 is not found
SSTR1 = ' STRCHR '
SSTR2 = ' s '
NPOs = Sstr1.index (SSTR2)
Print NPOs
5. Comparing Strings
Copy Code code as follows:
#strcmp (SSTR1,SSTR2)
SSTR1 = ' STRCHR '
SSTR2 = ' Strch '
Print CMP (SSTR1,SSTR2)
6. Whether the scanned string contains the specified characters
Copy Code code as follows:
#strspn (SSTR1,SSTR2)
SSTR1 = ' 12345678 '
SSTR2 = ' 456 '
#sStr1 and chars both in SSTR1 and SSTR2
Print Len (SSTR1 and SSTR2)
7, String length
Copy Code code as follows:
#strlen (SSTR1)
SSTR1 = ' strlen '
Print Len (SSTR1)
8. Convert uppercase and lowercase characters in a string
Copy Code code as follows:
S.lower () #小写
S.upper () #大写
S.swapcase () #大小写互换
S.capitalize () #首字母大写
String.capwords (S) #这是模块中的方法. It separates S with the split () function, and then uses capitalize () to capitalize the first letter, then merge it with join ().
#实例:
#strlwr (SSTR1)
SSTR1 = ' jcstrlwr '
SSTR1 = Sstr1.upper ()
#sStr1 = Sstr1.lower ()
Print SSTR1
9, append the specified length of the string
Copy Code code as follows:
#strncat (Sstr1,sstr2,n)
SSTR1 = ' 12345 '
SSTR2 = ' abcdef '
n = 3
SSTR1 + + sstr2[0:n]
Print SSTR1
10, string specified length comparison
Copy Code code as follows:
#strncmp (Sstr1,sstr2,n)
SSTR1 = ' 12345 '
SSTR2 = ' 123BC '
n = 3
Print CMP (Sstr1[0:n],sstr2[0:n])
11, copy the specified length of the characters
Copy Code code as follows:
#strncpy (Sstr1,sstr2,n)
SSTR1 = ' '
SSTR2 = ' 12345 '
n = 3
SSTR1 = Sstr2[0:n]
Print SSTR1
12. Replace the first n characters of the string with the specified characters
Copy Code code as follows:
#strnset (Sstr1,ch,n)
SSTR1 = ' 12345 '
ch = ' R '
n = 3
SSTR1 = n * ch + sstr1[3:]
Print SSTR1
13. Scan string
Copy Code code as follows:
#strpbrk (SSTR1,SSTR2)
SSTR1 = ' Cekjgdklab '
SSTR2 = ' Gka '
NPOs =-1
For C in SSTR1:
If C in SSTR2:
NPOs = Sstr1.index (c)
Break
Print NPOs
14, flip the string
Copy Code code as follows:
#strrev (SSTR1)
SSTR1 = ' ABCDEFG '
SSTR1 = Sstr1[::-1]
Print SSTR1
15. Find String
Copy Code code as follows:
#strstr (SSTR1,SSTR2)
SSTR1 = ' ABCDEFG '
SSTR2 = ' CDE '
Print Sstr1.find (SSTR2)
16. Split string
Copy Code code as follows:
#strtok (SSTR1,SSTR2)
SSTR1 = ' Ab,cde,fgh,ijk '
SSTR2 = ', '
SSTR1 = Sstr1[sstr1.find (SSTR2) + 1:]
Print SSTR1
#或者
s = ' Ab,cde,fgh,ijk '
Print (S.split (', '))
17. Connection string
Copy Code code as follows:
delimiter = ', '
MyList = [' Brazil ', ' Russia ', ' India ', ' ', ']
Print Delimiter.join (mylist)
18, the implementation of addslashes in PHP
Copy Code code as follows:
def addslashes (s):
D = {"': ' \ \", "'": "\ \", "C": "\\\0", "\": "\\\\"}
Return ". Join (D.get (c, c) for C in s)
s = "John ' Johny ' Doe" (a.k.a. \ "Super joe\") \\\0 "
Print S
Print Addslashes (s)
19. Show only letters and numbers
Copy Code code as follows:
def onlycharnum (s,oth= '):
S2 = S.lower ();
Fomart = ' abcdefghijklmnopqrstuvwxyz0123456789 '
For C in S2:
If not C in Fomart:
s = S.replace (c, ');
return s;
Print (Onlystr ("a000 aa-b"))
20, intercept the string
Copy Code code as follows:
str = ' 0123456789′
Print Str[0:3] #截取第一位到第三位的字符
Print str[:] #截取字符串的全部字符
Print Str[6:] #截取第七个字符到结尾
Print Str[:-3] #截取从头开始到倒数第三个字符之前
Print Str[2] #截取第三个字符
Print Str[-1] #截取倒数第一个字符
Print Str[::-1] #创造一个与原字符串顺序相反的字符串
Print Str[-3:-1] #截取倒数第三位与倒数第一位之前的字符
Print str[-3:] #截取倒数第三位到结尾
Print str[:-5:-3] #逆序截取, what do you mean, you don't get it?
21, the string in the output of the alignment
Copy Code code as follows:
S.ljust (Width,[fillchar])
#输出width个字符, S left alignment, less than the Fillchar fill, the default is a space.
S.rjust (Width,[fillchar]) #右对齐
S.center (width, [Fillchar]) #中间对齐
S.zfill (width) #把S变成width长, and in the right alignment, insufficient parts with 0 complement
22, search and replace in the string
Copy Code code as follows:
S.find (substr, [Start, [end]])
#返回S中出现substr的第一个字母的标号, if there is no substr in S, return-1. The start and end functions are equivalent to searching in s[start:end]
S.index (substr, [Start, [end]])
#与find () is the same, except when there is no substr in S, a run-time error is returned
S.rfind (substr, [Start, [end]])
#返回S中最后出现的substr的第一个字母的标号, if there is no substr in S, return-1, that is to say, the first letter of the substr that appears from the right.
S.rindex (substr, [Start, [end]])
S.count (substr, [Start, [end]]) #计算substr在S中出现的次数
S.replace (Oldstr, Newstr, [Count])
#把S中的oldstar替换为newstr, Count is the number of substitutions. This is the general form of substitution and some functions for special character substitution
S.strip ([chars])
#把S中前后chars中有的字符全部去掉, it can be understood to replace s before and after chars with none
S.lstrip ([chars])
S.rstrip ([chars])
S.expandtabs ([tabsize])
#把S中的tab字符替换没空格, each tab is replaced with a tabsize space, and the default is 8
23, String segmentation and combination
Copy Code code as follows:
S.split ([Sep, [Maxsplit]])
#以sep为分隔符, divide s into a list. Maxsplit represents the number of splits. The default delimiter is a blank character
S.rsplit ([Sep, [Maxsplit]])
S.splitlines ([keepends])
#把S按照行分割符分为一个list, Keepends is a bool value, and if true, the row delimiter is preserved after each row.
S.join (seq) #把seq代表的序列--sequence of strings, connected with s
24, the mapping of the string, this function contains two functions
Copy Code code as follows:
String.maketrans (from, to)
#返回一个256个字符组成的翻译表, where the characters in the from are converted to "to" by one by one, so that from and to must be equal length.
S.translate (Table[,deletechars])
# Use the above function to translate the form after the Deletechars, and to delete some characters from it. Note that if S is a Unicode string, the Deletechars argument is not supported, and you can implement the same functionality in a way that translates a character to none. You can also use the features of the codecs module to create more powerful translation tables.
25, string and a pair of encoding and decoding functions
Copy Code code as follows:
S.encode ([encoding,[errors]])
# where encoding can have a variety of values, such as gb2312 GBK gb18030 bz2 zlib Big5 bzse64, etc. are supported. Errors The default value is "strict", meaning unicodeerror. Possible values are ' ignore ', ' replace ', ' xmlcharrefreplace ', ' backslashreplace ' and all the values registered through Codecs.register_error. This section covers the codecs module, not the special understanding
S.decode ([encoding,[errors]])
26, the string test, the judgment function, this kind of function is not in the string module, these functions return is the BOOL value
Copy Code code as follows:
S.startswith (Prefix[,start[,end]])
#是否以prefix开头
S.endswith (Suffix[,start[,end]])
#以suffix结尾
S.isalnum ()
#是否全是字母和数字, and at least one character
S.isalpha () #是否全是字母, and has at least one character
S.isdigit () #是否全是数字, and has at least one character
S.isspace () #是否全是空白字符, and has at least one character
S.islower () #S中的字母是否全是小写
S.isupper () #S中的字母是否便是大写
S.istitle () #S是否是首字母大写的
27, the String type conversion function, these functions only in the string module has
Copy Code code as follows:
String.atoi (S[,base])
#base默认为10, if 0, then s can be 012 or 0x23 This form of string, if 16 then S is only 0x23 or 0x12 this form of string
String.atol (S[,base]) #转成long
String.atof (S[,base]) #转成float
Again, the string object is immutable, meaning you can't change a part of the character after Python creates a string. Any of the above functions will return a new string after the string has been changed, and the source string has not changed. In fact, this is also a workaround, you can use the S=list (s) function to change S to a single character as a member of the list, so you can use the s[3]= ' a ' method of changing the value, and then use s= "". Join (s) revert to a string
