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12 - container - string

2022-04-22 05:58:00 【ʕ·͡ˑ· ཻ ʔ**ʕ·͡ˑ· ཻ ʔ】

Catalog

One 、 Definition of string

Two 、 Special string handling

3、 ... and 、 Subscript （ Indexes ）

Four 、 section

5、 ... and 、 String lookup method find()

6、 ... and 、 String substitution method replace（）

7、 ... and 、 String splitting method split()

8、 ... and 、 String connection method join

One 、 Definition of string

Two 、 Special string handling

  • Application scenarios ： According to different needs , Sometimes you need to deal with some special string data .

3、 ... and 、 Subscript （ Indexes ）

  • Definition ： The index is the data in the container （ character string 、 list 、 Tuples ） Position in , Number . Generally, positive index is used , from 0 Start .
  • effect ： You can get the data of a specific location in the container through the index .
  • Usage method ： Containers [ Subscript ]
Be careful ：Python Support negative subscripts in ,-1 Data identifying the last location .

Four 、 section

  • effect ： Using slicing operations , Multiple data in the container can be obtained at one time .
Be careful ：
There are certain rules between multiple data , The subscript of the data is A sequence of equal differences .
A sequence of equal differences ： The difference between two adjacent numbers is the same .
  • grammar ： Containers 【start:end:step】

5、 ... and 、 character string To find the way find()

  • Usage method ：
  • effect ： Whether the searched character exists in the current string .
  • explain ：
character string . find ( sub_str ), In the string Find if it exists sub_str Such a string .
Return value （ The execution result of this line of code ）：
If there is sub_str, Back to the first time sub_str Subscript of position .
If it doesn't exist sub_str, return -1.
  • Illustrate with examples - String search
demand ：
1. Existing string data : ' Black horse programmer '
2. Please design the program , Implement judgment " Dark horse " and " White horse " Whether it exists in the data
3. It is required that if the data exists , Where the output data is located .

6、 ... and 、 String substitution method replace（）

  • Usage method ：
  • effect ： Use new substring , Replace the old string contents according to the rules . The string is of immutable data type , So the modification will not affect the original content .
  • explain ：
character string . replace ( old , new , count ), In the string old character string Replace with new character string .
old： Original string , Replaced string .
new： Line string , String to replace with .
count： Generally do not write , Means replace all , You can specify the number of times to replace .
Return value ： Will return a complete string after replacement .
Be careful ： The original string will not change .
  • Illustrate with examples - String substitution
demand ：
1. Existing string data : ' The army hotpot is so delicious ！'
2. Please design the program , The implementation will ' Chengdu hot pot is so delicious ！'

7、 ... and 、 String splitting method split()

  • Usage method ：
  • effect ： Separates strings by the specified character .
  • explain ：
character string . split ( sep ), Set the string to the specified string sep separation .
-sep： according to sep Separate , Don't write , By default, it is separated by white space characters .
Blank character ： Space 、\t、\n.
return ： list , Each data in the list is a separated string .
Illustrate with examples - String splitting
demand ：
1. Existing string data : 'hello Python and itcast and itheima'.
2. Please design the program , Use and Split string .

8、 ... and 、 String connection method join

  • Usage method ：
  • effect ： It is generally used to merge the list into a string according to the specified sub characters .
  • explain ：
character string . join ( Containers ), Containers are usually lists , Insert a string between two adjacent data , Make a new string .
Data in the list , It must be all strings .
  • Illustrate with examples - String connection

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