Python learning 2-using strings

String

All standard frontal sequence operations (index, Shard, multiply, Judge membership, seek length, maximum minimum) apply to the string, but the string is immutable

>>> a  = ' My name is Hahaahh ' >>> a[:3] = ' SDSD 'Traceback (most recent call last):  File "<p Yshell#24> ", line 1, inch <module>    a[:3] = ' SDSD 'TypeError: ' str ' object does not support item Assignme NT  

String Format Strings-Lite version

String formatting applies to the string formatting operator, which is percent% to implement

--formatted string%s

>>> format = ' Hello,%s,%s enough for you ' >>> values = (' haha ', ' Zhang ') >>> print format%
    
      Valueshello, Haha,zhang enough for 
     you

If you want to format a real number, use the%f

Formatted string--full version

Pass

String Method--to enumerate some particularly useful

Find-You can find substrings in a longer string, return the leftmost index where the substring is located, and return 1 if not found

>>> A = "Zhang is a good boy" >>> a.find ("is") 6>>> a.find ("Cheng") -1>>> " Zhang is a ". Find (" a ") 2  

Join--Used to concatenate elements in a sequence (elements must all be strings), which is the inverse method of Split

>>>SEQ = ["1", "2", "3"]>>> Sep = "+" >>> sep.join (seq) ' 1+2+3 ' 

Lower--The lowercase master that returns a string

Replace--Returns the string after all occurrences of a string have been replaced

>>> ' This was a boy '. Replace (' was ', ' KK ') ' Thkk kk a boy '

Split--Splitting a string into a sequence is the inverse method of join

>>> ' 1+2+3+4+5 '. Split (' + ') [' 1 ', ' 2 ', ' 3 ', ' 4 ', ' 5 '] #如果不提供分隔符, then use a space as a separator >>> "I am a Boy". sp Lit () [' I ', ' am ', ' a ', ' Boy ']  

Strip--Remove the spaces on both sides

Translate--can replace some parts of a string, but unlike replace, he only handles a single character

Python learning 2-using strings