python function Tutorial: Python string operations (string substitutions, deletions, intercepted, copied, connection, comparison, look, comprising a case conversion, division, etc.)

This article describes the Python string operations (string replace, delete, capture, copy, connect, compare, find, contain, case conversion, division, etc.), need a friend at the reference
to spaces and special symbols

s.strip().lstrip().rstrip(',')

Python strip () method used to remove the head and tail of the specified character string (default is a space).

Copy the string

#strcpy(sStr1,sStr2)
sStr1 = 'strcpy'
sStr2 = sStr1
sStr1 = 'strcpy2'
print sStr2

Connection String

#strcat(sStr1,sStr2)
sStr1 = 'strcat'
sStr2 = 'append'
sStr1 += sStr2
print sStr1

Find character

#strchr(sStr1,sStr2)
# < 0 为未找到
sStr1 = 'strchr'
sStr2 = 's'
nPos = sStr1.index(sStr2)
print nPos

String comparison

#strcmp(sStr1,sStr2)
sStr1 = 'strchr'
sStr2 = 'strch'
print cmp(sStr1,sStr2)

Whether to scan the string contains the specified character

#strspn(sStr1,sStr2)
sStr1 = '12345678'
sStr2 = '456'
#sStr1 and chars both in sStr1 and sStr2
print len(sStr1 and sStr2)

String length

#strlen(sStr1)
sStr1 = 'strlen'
print len(sStr1)

The string case conversion

#strlwr(sStr1)
sStr1 = 'JCstrlwr'
sStr1 = sStr1.upper()
#sStr1 = sStr1.lower()
print sStr1

Additional string of specified length

#strncat(sStr1,sStr2,n)
sStr1 = '12345'
sStr2 = 'abcdef'
n = 3
sStr1 += sStr2[0:n]
print sStr1

Comparative specified length

#strncmp(sStr1,sStr2,n)
sStr1 = '12345'
sStr2 = '123bc'
n = 3
print cmp(sStr1[0:n],sStr2[0:n])

Copy the characters specified length

#strncpy(sStr1,sStr2,n)
sStr1 = ''
sStr2 = '12345'
n = 3
sStr1 = sStr2[0:n]
print sStr1

The first n characters of the string is replaced with the specified character

#strnset(sStr1,ch,n)
sStr1 = '12345'
ch = 'r'
n = 3
sStr1 = n * ch + sStr1[3:]
print sStr1

Scan string

#strpbrk(sStr1,sStr2)
sStr1 = 'cekjgdklab'
sStr2 = 'gka'
nPos = -1
for c in sStr1:
  if c in sStr2:
    nPos = sStr1.index(c)
    break
print nPos

Flip string

#strrev(sStr1)
sStr1 = 'abcdefg'
sStr1 = sStr1[::-1]
print sStr1

Find string

#strstr(sStr1,sStr2)
sStr1 = 'abcdefg'
sStr2 = 'cde'
print sStr1.find(sStr2)

Split string

#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(','))

Connection String

delimiter = ','
mylist = ['Brazil', 'Russia', 'India', 'China']
print delimiter.join(mylist)

Implementation in PHP addslashes

def addslashes(s):
  d = {'"':'\\"', "'":"\\'", "\0":"\\\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)

Show only letters and numbers

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"))

Interception string

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，具体啥意思没搞明白？

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