Python Learning-2 days--string manipulation

The string is the most commonly used data type in Python. We can use quotation marks (' or ') to create a string.

Creating a string is simple, as long as you assign a value to the variable. For example:

     #!/usr/bin/env python
    #     name= ' Hello '
    name1= Python '

Here are some of the characters commonly used in Python to create an operational collation. If not all please forgive!

#!/usr/bin/env python# the basic operation of the string name= ' Hello ' name1= ' python ' #+ plus   used to concatenate strings print  (name +  name1) #运行结果为HelloPython #*  multiplication sign, used to repeat the character create print (name*2)  #  run the result as:hellohello#[]  brackets according to the index ( That is, the location and the list are all starting from 0) print  (name[0]) #如果是0的话打印出来的就是H, if 1  is e# ":" Intercept word a part: such as "0:3" print  (Name[0:3])   #运行结果为:hel#in   represents a character that is present in the string when returned trueif  ' H '  in name:     print  (' h  in  name  variable ') #not  in  If a character does not exist in the string, return trueif  ' y '  not in  name:    print  (' y  does not exist in Variable name ') #python对于字符串的内建常用操作方法 #center  Specifies a string,-  with a python-centered width of 50 as the fill symbol. print  (' Python '. Center (+, '-')) #运行结果为:------------python------------#count    stats ' l '   There were several print  (' Hello '. Count (' l ')) in the "Hello" character Genesis #endswith   to determine if the string ends with ' lo ' and then returns a true value print  (' Hello '). EndsWith (' lo ')) #startswith    determines if the string is preceded by   ' he '  , and returns a true value print  (' Hello '. StartsWith (' He ')) #index   Find  h  the index in the string is also the location. print  (' Python '. Index (' h ')) #运行结果是  h  The index position in the Python string is  3#find  find  y  position in the string, Equivalent to index&nbsp, but find if not in the string returns a value of-1 print  (' Python ' .find  (' y ')) #strip   Eliminate spaces one =  input  (' Please enter a word prompt: ') if one.strip ()  ==  ' Wang ':    print  (' you entered the correct ') # Run results   is the input Wang this string if followed by a space, will also be recognized as correct, if there is no strip this parameter when the input wang  with a space will be an error #isdigit ()   To determine whether you enter a pure number, Is the number that returns truetwo = input  (' Please enter Number: ') ' 123 '. IsDigit () if two.isdigit ():     print  (' You enter a number ') Else:    print (' Please enter a pure number ') #.isalnum ()   Determine if the input contains special characters, No special characters are returned Truestr=input (' Please enter your content:  ') if str.isalnum ():    print  (' input correct ') Else:     print  (' Please do not enter special characters ')

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Python Learning-2 days--string manipulation