Python programming-detailed description of string-related operation examples, pythonstring

Python programming-detailed description of string-related operation examples, pythonstring

This article describes the string-related operations for Python programming. We will share this with you for your reference. The details are as follows:

# Coding = utf8''' string is the most common type in Python. You can create a bucket by using quotation marks. In Python, single quotes and double quotes have the same effect. The string type is immutable, that is, to change the element of a string, you need to create a new string. A string is composed of independent characters that can be accessed in sequence by slicing. '''Class StringClass (object): ''' creating a string is as simple as using a scalar. You can also use the str factory function to create a string and assign it to a variable. ''' # Use single quotes to create a string and assign the value aString = 'signal quote' # Use double quotes to create a string and assign the value anotherString = "double quote" # Use the factory function str to convert a list into string StringByStr = str (range (len (aString ))) def ouput (self): print ''' aString: % sanotherString: % sStringByStr: % s' % (self. aString, self. anotherString, self. stringByStr) # access string value (character and substring) def getStringValue (self): ''' Python does not have this type of character, the concept of character is represented by a string with a length of 1. Use square brackets to add one or more indexes to obtain substrings. ''' # Obtain the value of a character in the string char = self. aString [2] print "the third character of aString is:", char # obtain the subString = self between the first character and the sixth character. anotherString [0: 5] print "sub-string between the first and sixth characters of anotherString:", subString # obtain the character evenSubString = self. anotherString [1: 2] print "The even string of anotherString is:", evenSubString # change the string value def changeString (self ): ''''' update an existing string by assigning values to the variable. The string type is unchangeable. To change a string, you must create a new string. You cannot change only one character or substring in a string. However, you can splice all parts of an old string to get a new string. '''Print self. aString, "aString id:", id (self. aString), self. aString + = ", python" print self. aString, "aString id:", id (self. aString) # incorrect operation. One character or substring in the string cannot be changed # self. aString [2] = "h" # print self. aString # self. aString [0: 2] = "he" # print self. aString # delete character and string def delString (self): ''' the string is unchangeable. You cannot just delete a character from a string, but can clear an empty string, alternatively, you can use the slice operation to create a new string. '''Self. stringByStr = self. stringByStr [: 3] + self. stringByStr [8:] print self. stringByStr # Empty string self. stringByStr = ''print self. stringByStr # Use del to delete a string try: del self. stringByStr print self. stringByStr failed t BaseException, e: print edef test (): StrObj = StringClass () StrObj. ouput () StrObj. getStringValue () StrObj. changeString () StrObj. delString () if _ name __= = "_ main _": test ()

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